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README.md
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example.c
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fcalc.c
test.c
test.c

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fcalc

a basic calculator, fully contained within a single function, released into the public domain.

Features

  • Contained in a single C function
  • Less than 100 lines long!
  • Fully C89 compliant
  • Absolutely NO dependency on the standard library
  • No use of static or global variables (trivial to use in multithreaded programs)
  • No allocations
  • Public domain (go nuts with it)
  • Floating-point math
  • Supported operations:
  • addition (+)
  • subtraction (-)
  • multiplication (*)
  • division (/)
  • negation (-)
  • Easy to extend
  • Has a builtin 'pi' constant

Usage

Using fcalc in your own program is trivial. Just copy the fcalc function into a source file and call it like this:

char *input = ...;
double result = fcalc(&input, NULL, 0);

Or, if you want to handle errors:

char *input = ...;
int err;
double result = fcalc(&input, &err, 0);

Where err will return one of three possible values: 0: success 1: success with errors -1: error

A common use case

An extremely common use case for something like fcalc would be almost any time you want the user of your program to input a number. This way, they can input small mathematical terms instead of plain numbers, so they don't have compute it in their own heads (or use some desktop calculator). Many programs like GIMP or Blender already offer this feature, and fcalc is mainly intended to be a simple and easy prebaked solution for any other user-interfacing program wanting to follow suit.

Crediting

Even though fcalc is released to the public domain and you are free to do anything you want with it, I would really appreciate it if you keep the small header comment crediting me as the original author of fcalc in your code.

About

a basic calculator, fully contained within a single function, released into the public domain.

Resources

Readme
Unlicense
Activity

Stars

5 stars

Watchers

1 watching

Forks

0 forks
Report repository

Releases

Packages

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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fcalc
a basic calculator, fully contained within a single function, released into the public domain.
Features
  • Contained in a single C function
  • Less than 100 lines long!
  • Fully C89 compliant
  • Absolutely NO dependency on the standard library
  • No use of static or global variables (trivial to use in multithreaded programs)
  • No allocations
  • Public domain (go nuts with it)
  • Floating-point math
  • Supported operations:
  • addition (+)
  • subtraction (-)
  • multiplication (*)
  • division (/)
  • negation (-)
  • Easy to extend
  • Has a builtin 'pi' constant
Usage
Using fcalc in your own program is trivial. Just copy the fcalc function into a source file and call it like this:
char *input = ...;
double result = fcalc(&input, NULL, 0);

Or, if you want to handle errors:
char *input = ...;
int err;
double result = fcalc(&input, &err, 0);

Where err will return one of three possible values:
0: success
1: success with errors
-1: error
A common use case
An extremely common use case for something like fcalc would be almost any time you want the user of your program to input a number.
This way, they can input small mathematical terms instead of plain numbers, so they don't have compute it in their own heads (or use some desktop calculator). Many programs like GIMP or Blender already offer this feature, and fcalc is mainly intended to be a simple and easy prebaked solution for any other user-interfacing program wanting to follow suit.
Crediting
Even though fcalc is released to the public domain and you are free to do anything you want with it, I would really appreciate it if you keep the small header comment crediting me as the original author of fcalc in your code.
About
a basic calculator, fully contained within a single function, released into the public domain.
Resources
Readme
Unlicense
Activity
Stars
5 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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fcalc.c
test.c
test.c
Repository files navigation
fcalc
a basic calculator, fully contained within a single function, released into the public domain.
Features
  • Contained in a single C function
  • Less than 100 lines long!
  • Fully C89 compliant
  • Absolutely NO dependency on the standard library
  • No use of static or global variables (trivial to use in multithreaded programs)
  • No allocations
  • Public domain (go nuts with it)
  • Floating-point math
  • Supported operations:
  • addition (+)
  • subtraction (-)
  • multiplication (*)
  • division (/)
  • negation (-)
  • Easy to extend
  • Has a builtin 'pi' constant
Usage
Using fcalc in your own program is trivial. Just copy the fcalc function into a source file and call it like this:
char *input = ...;
double result = fcalc(&input, NULL, 0);

Or, if you want to handle errors:
char *input = ...;
int err;
double result = fcalc(&input, &err, 0);

Where err will return one of three possible values:
0: success
1: success with errors
-1: error
A common use case
An extremely common use case for something like fcalc would be almost any time you want the user of your program to input a number.
This way, they can input small mathematical terms instead of plain numbers, so they don't have compute it in their own heads (or use some desktop calculator). Many programs like GIMP or Blender already offer this feature, and fcalc is mainly intended to be a simple and easy prebaked solution for any other user-interfacing program wanting to follow suit.
Crediting
Even though fcalc is released to the public domain and you are free to do anything you want with it, I would really appreciate it if you keep the small header comment crediting me as the original author of fcalc in your code.
About
a basic calculator, fully contained within a single function, released into the public domain.
Resources
Readme
Unlicense
Activity
Stars
5 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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NameName
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fcalc.c
test.c
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Repository files navigation
fcalc
a basic calculator, fully contained within a single function, released into the public domain.
Features
  • Contained in a single C function
  • Less than 100 lines long!
  • Fully C89 compliant
  • Absolutely NO dependency on the standard library
  • No use of static or global variables (trivial to use in multithreaded programs)
  • No allocations
  • Public domain (go nuts with it)
  • Floating-point math
  • Supported operations:
  • addition (+)
  • subtraction (-)
  • multiplication (*)
  • division (/)
  • negation (-)
  • Easy to extend
  • Has a builtin 'pi' constant
Usage
Using fcalc in your own program is trivial. Just copy the fcalc function into a source file and call it like this:
char *input = ...;
double result = fcalc(&input, NULL, 0);

Or, if you want to handle errors:
char *input = ...;
int err;
double result = fcalc(&input, &err, 0);

Where err will return one of three possible values:
0: success
1: success with errors
-1: error
A common use case
An extremely common use case for something like fcalc would be almost any time you want the user of your program to input a number.
This way, they can input small mathematical terms instead of plain numbers, so they don't have compute it in their own heads (or use some desktop calculator). Many programs like GIMP or Blender already offer this feature, and fcalc is mainly intended to be a simple and easy prebaked solution for any other user-interfacing program wanting to follow suit.
Crediting
Even though fcalc is released to the public domain and you are free to do anything you want with it, I would really appreciate it if you keep the small header comment crediting me as the original author of fcalc in your code.
About
a basic calculator, fully contained within a single function, released into the public domain.
Resources
Readme
Unlicense
Activity
Stars
5 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
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7 Commits
Folders and files
NameName
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README.md
example.c
example.c
fcalc.c
fcalc.c
test.c
test.c
Repository files navigation
fcalc
a basic calculator, fully contained within a single function, released into the public domain.
Features
  • Contained in a single C function
  • Less than 100 lines long!
  • Fully C89 compliant
  • Absolutely NO dependency on the standard library
  • No use of static or global variables (trivial to use in multithreaded programs)
  • No allocations
  • Public domain (go nuts with it)
  • Floating-point math
  • Supported operations:
  • addition (+)
  • subtraction (-)
  • multiplication (*)
  • division (/)
  • negation (-)
  • Easy to extend
  • Has a builtin 'pi' constant
Usage
Using fcalc in your own program is trivial. Just copy the fcalc function into a source file and call it like this:
char *input = ...;
double result = fcalc(&input, NULL, 0);

Or, if you want to handle errors:
char *input = ...;
int err;
double result = fcalc(&input, &err, 0);

Where err will return one of three possible values:
0: success
1: success with errors
-1: error
A common use case
An extremely common use case for something like fcalc would be almost any time you want the user of your program to input a number.
This way, they can input small mathematical terms instead of plain numbers, so they don't have compute it in their own heads (or use some desktop calculator). Many programs like GIMP or Blender already offer this feature, and fcalc is mainly intended to be a simple and easy prebaked solution for any other user-interfacing program wanting to follow suit.
Crediting
Even though fcalc is released to the public domain and you are free to do anything you want with it, I would really appreciate it if you keep the small header comment crediting me as the original author of fcalc in your code.
About
a basic calculator, fully contained within a single function, released into the public domain.
Resources
Readme
Unlicense
Activity
Stars
5 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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fcalc.c
test.c
test.c
Repository files navigation
fcalc
a basic calculator, fully contained within a single function, released into the public domain.
Features
  • Contained in a single C function
  • Less than 100 lines long!
  • Fully C89 compliant
  • Absolutely NO dependency on the standard library
  • No use of static or global variables (trivial to use in multithreaded programs)
  • No allocations
  • Public domain (go nuts with it)
  • Floating-point math
  • Supported operations:
  • addition (+)
  • subtraction (-)
  • multiplication (*)
  • division (/)
  • negation (-)
  • Easy to extend
  • Has a builtin 'pi' constant
Usage
Using fcalc in your own program is trivial. Just copy the fcalc function into a source file and call it like this:
char *input = ...;
double result = fcalc(&input, NULL, 0);

Or, if you want to handle errors:
char *input = ...;
int err;
double result = fcalc(&input, &err, 0);

Where err will return one of three possible values:
0: success
1: success with errors
-1: error
A common use case
An extremely common use case for something like fcalc would be almost any time you want the user of your program to input a number.
This way, they can input small mathematical terms instead of plain numbers, so they don't have compute it in their own heads (or use some desktop calculator). Many programs like GIMP or Blender already offer this feature, and fcalc is mainly intended to be a simple and easy prebaked solution for any other user-interfacing program wanting to follow suit.
Crediting
Even though fcalc is released to the public domain and you are free to do anything you want with it, I would really appreciate it if you keep the small header comment crediting me as the original author of fcalc in your code.
About
a basic calculator, fully contained within a single function, released into the public domain.
Resources
Readme
Unlicense
Activity
Stars
5 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
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7 Commits
Folders and files
NameName
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LICENSE
README.md
README.md
example.c
example.c
fcalc.c
fcalc.c
test.c
test.c
Repository files navigation
fcalc
a basic calculator, fully contained within a single function, released into the public domain.
Features
  • Contained in a single C function
  • Less than 100 lines long!
  • Fully C89 compliant
  • Absolutely NO dependency on the standard library
  • No use of static or global variables (trivial to use in multithreaded programs)
  • No allocations
  • Public domain (go nuts with it)
  • Floating-point math
  • Supported operations:
  • addition (+)
  • subtraction (-)
  • multiplication (*)
  • division (/)
  • negation (-)
  • Easy to extend
  • Has a builtin 'pi' constant
Usage
Using fcalc in your own program is trivial. Just copy the fcalc function into a source file and call it like this:
char *input = ...;
double result = fcalc(&input, NULL, 0);

Or, if you want to handle errors:
char *input = ...;
int err;
double result = fcalc(&input, &err, 0);

Where err will return one of three possible values:
0: success
1: success with errors
-1: error
A common use case
An extremely common use case for something like fcalc would be almost any time you want the user of your program to input a number.
This way, they can input small mathematical terms instead of plain numbers, so they don't have compute it in their own heads (or use some desktop calculator). Many programs like GIMP or Blender already offer this feature, and fcalc is mainly intended to be a simple and easy prebaked solution for any other user-interfacing program wanting to follow suit.
Crediting
Even though fcalc is released to the public domain and you are free to do anything you want with it, I would really appreciate it if you keep the small header comment crediting me as the original author of fcalc in your code.
About
a basic calculator, fully contained within a single function, released into the public domain.
Resources
Readme
Unlicense
Activity
Stars
5 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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fcalc
a basic calculator, fully contained within a single function, released into the public domain.
Features
  • Contained in a single C function
  • Less than 100 lines long!
  • Fully C89 compliant
  • Absolutely NO dependency on the standard library
  • No use of static or global variables (trivial to use in multithreaded programs)
  • No allocations
  • Public domain (go nuts with it)
  • Floating-point math
  • Supported operations:
  • addition (+)
  • subtraction (-)
  • multiplication (*)
  • division (/)
  • negation (-)
  • Easy to extend
  • Has a builtin 'pi' constant
Usage
Using fcalc in your own program is trivial. Just copy the fcalc function into a source file and call it like this:
char *input = ...;
double result = fcalc(&input, NULL, 0);

Or, if you want to handle errors:
char *input = ...;
int err;
double result = fcalc(&input, &err, 0);

Where err will return one of three possible values:
0: success
1: success with errors
-1: error
A common use case
An extremely common use case for something like fcalc would be almost any time you want the user of your program to input a number.
This way, they can input small mathematical terms instead of plain numbers, so they don't have compute it in their own heads (or use some desktop calculator). Many programs like GIMP or Blender already offer this feature, and fcalc is mainly intended to be a simple and easy prebaked solution for any other user-interfacing program wanting to follow suit.
Crediting
Even though fcalc is released to the public domain and you are free to do anything you want with it, I would really appreciate it if you keep the small header comment crediting me as the original author of fcalc in your code.
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a basic calculator, fully contained within a single function, released into the public domain.
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