C-pointer-lab/pointer.c at main · HasibCoderLab/C-pointer-lab · GitHub

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// ================================================
// * Language: C
// * Topic: Pointer
// =================================================

// pointer example 1️⃣
#include<stdio.h>
intmain(){
intage=20 ;
int*ptr=&age;
int_age=*ptr ;
printf(" Output is %d\n" , _age);
return0;
}

// Print Address

#include<stdio.h>
intmain()
{
intage=10;
int*ptr=&age;
int_age=*ptr;
//printf("Output is %p\n" ,&age );
printf("Output is %u\n", &ptr); // Different
printf("Output is %u\n", ptr);
printf("Output is %u\n", &age);

return0;
}

// Print value
#include<stdio.h>
intmain(){
intage=12 ;
int*ptr=&age ;
int_age=*ptr;
printf("Output is : %d\n", age);
printf("Output is : %d\n" , *ptr);
printf("Output is : %d\n" , *(&age)) ;
return0;
}

// ================================================
// * Language: C
// * Topic: Pointer to Pointer
// =================================================

// pointer example 2️⃣

#include<stdio.h>
intmain()
{
intprice=100;
int*ptr=&price;
int**pptr=&ptr;
return0;
}

// 3️⃣ Call by value

#include<stdio.h>
voidnum(intn);
intmain(){
intnumber=10;
num(number);
printf("Number is %d\n" , number );
return0;
}

voidnum(intn){
n=n*n;
printf("Square is %d\n " , n);
}

// 4️⃣ Call by Reference

#include<stdio.h>
void_square(int*n);
voidsquare(inta);

intmain()
{
intx=4;
// int y = 3;
square(x); // function call
printf("value of x %d\n", x);
_square(&x);
printf("value of &x %d\n", x);
return0;
}
// fuction definition
voidsquare(inta)
{
// a = a*a;
intresult=a*a;
printf(" Result of square %d\n", result);
}
void_square(int*n)
{
*n= (*n) * (*n);
printf("_square is %d\n", *n);
}

// 👉👉 🔹🔹Qexample - 5️⃣ Swap 2 Numbers a & b

#include<stdio.h>
intmain(){
inta=55 ;
intb=33;

intt=a;
a=b ;
b=t;
printf("a = %d & b = %d\n" , a ,b);
return0;
}

// 👉👉 🔹🔹example - 6️⃣ Swap 2 Numbers a & b call by reference

#include<stdio.h>
int_swap(int*a ,int*b);
intmain(){
inta=10;
intb=20;
_swap(&a ,&b);
printf("a = %d b = %d\n" ,a,b );
return0 ;

}
// Fucntion difinition;
int_swap(int*a , int*b){
intt=*a;
*a=*b;
*b=t;
printf("a = %d & b = %d\n", *a,*b);
}