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//三角形の計算
//
#include<iostream>
#include<math.h>
#defineRadToDec57.29577951f;
#defineDecToRad0.017453293f;
usingnamespacestd;
voidshowSelection();
voidthreeline();
voidtwoline();
voidoneline();
double a;
double b;
double c;
double arga;
double argb;
double argc;
double rada;
double radb;
double radc;
intmain()
{
char choice=0;
showSelection();
while (choice != 'q')
{
cout << "a=";
cin >> a;
cout << "b=";
cin >> b;
cout << "c=";
cin >> c;
cout << "α=";
cin >> arga;
cout << "β=";
cin >> argb;
cout << "γ=";
cin >> argc;
if (a != 0){
if (b != 0){
if (c != 0)
threeline();
else
twoline();
}
elseif (c != 0)
twoline();
else
oneline();
}
elseif (b != 0){
if (c != 0)
twoline();
else
oneline();
}
elseif(c!=0){
if (arga == 0 && argb == 0 || arga == 0 && argc == 0 || argb == 0 && argc == 0){
cout << "それでは求められません";
}
oneline();
}
else
{
cout << "それでは求められません\n";
}
cout << "終わるならｑを押してください";
cin >> choice;
}//end while
cout << "終了します\n";
return0;
}
//選択画面作成
voidshowSelection()
{
cout << "\n";
cout << "三角形の計算\n";
cout << "辺の値と角度を入力してください。\n";
cout << "求めたい値のところは0を入力してください。\n";
cout << "\n";
}
//3辺の値
voidthreeline()
{
arga = (double)acos((b * b + c * c - a * a) / (2 * b * c)) * RadToDec;
argb = (double)acos((c * c + a * a - b * b) / (2 * c * a)) * RadToDec;
argc = (double)acos((a * a + b * b - c * c) / (2 * a * b)) * RadToDec;
cout << "3角の大きさはα=" << arga << ",β=" << argb << ",γ=" << argc << "です。\n";
}
voidtwoline()
{
if (arga != 0){
rada = arga * DecToRad;
a = (double)sqrt(c * c + b * b - 2 * c * b * cosf(rada));
argc = (double)asin(c * sinf(rada) / a) * RadToDec;
argb = (double)asin(b * sinf(rada) / a) * RadToDec;
cout << "残りの辺の長さはa=" << a << ",角はβ=" << argb << ",γ=" << argc << "です。\n";
}
elseif (argb != 0){
radb = argb*DecToRad;
b = (double)sqrt(a * a + c * c - 2 * a * c * cosf(radb));
arga = (double)asin(a * sinf(radb) / b) * RadToDec;
argc = (double)asin(c * sinf(radb) / b) * RadToDec;
cout << "残りの辺の長さはb=" << b << ",角はα=" << arga << ",γ=" << argc << "です。\n";
}
else{
radc = argc*DecToRad;
c = (double)sqrt(a * a + b * b - 2 * a * b * cosf(radc));
arga = (double)asin(a * sinf(radc) / c) * RadToDec;
argb = (double)asin(b * sinf(radc) / c) * RadToDec;
cout << "残りの辺の長さはc=" << c << ",角はα=" << arga << ",β=" << argb << "です。\n";
}
}
voidoneline()
{
if (arga == 0){
arga = 180 - argb - argc;
rada = arga * DecToRad;
radb = argb * DecToRad;
radc = argc * DecToRad;
if (a != 0){
b = a * sinf(radb) / sinf(rada);
c = a * sinf(radc) / sinf(rada);
cout << "残りの角の大きさはα=" << arga << ",辺の長さはb=" << b << ",c=" << c << "です。\n";
}
elseif (b != 0){
a = b * sinf(radb) / sinf(rada);
c = b * sinf(radc) / sinf(rada);
cout << "残りの角の大きさはα=" << arga << ",辺の長さはa=" << a << ",c=" << c << "です。\n";
}
else{
a = c * sinf(radb) / sinf(rada);
b = c * sinf(radc) / sinf(rada);
cout << "残りの角の大きさはα=" << arga << ",辺の長さはa=" << a << ",b=" << b << "です。\n";
}
}
elseif (argb == 0){
argb = 180 - arga - argc;
rada = arga * DecToRad;
radb = argb * DecToRad;
radc = argc * DecToRad;
if (a != 0){
b = a * sinf(radb) / sinf(rada);
c = a * sinf(radc) / sinf(rada);
cout << "残りの角の大きさはβ=" << argb << ",辺の長さはb=" << b << ",c=" << c << "です。\n";
}
elseif (b != 0){
a = b * sinf(radb) / sinf(rada);
c = b * sinf(radc) / sinf(rada);
cout << "残りの角の大きさはβ=" << argb << ",辺の長さはa=" << a << ",c=" << c << "です。\n";
}
else{
a = c * sinf(radb) / sinf(rada);
b = c * sinf(radc) / sinf(rada);
cout << "残りの角の大きさはβ=" << argb << ",辺の長さはa=" << a << ",b=" << b << "です。\n";
}
}
else{
argc = 180 - arga - argb;
rada = arga * DecToRad;
radb = argb * DecToRad;
radc = argc * DecToRad;
if (a != 0){
b = a * sinf(radb) / sinf(rada);
c = a * sinf(radc) / sinf(rada);
cout << "残りの角の大きさはγ=" << argc << ",辺の長さはb=" << b << ",c=" << c << "です。\n";
}
elseif (b != 0){
a = b * sinf(radb) / sinf(rada);
c = b * sinf(radc) / sinf(rada);
cout << "残りの角の大きさはγ=" << argc << ",辺の長さはa=" << a << ",c=" << c << "です。\n";
}
else{
a = c * sinf(radb) / sinf(rada);
b = c * sinf(radc) / sinf(rada);
cout << "残りの角の大きさはγ=" << argc << ",辺の長さはa=" << a << ",b=" << b << "です。\n";
}
}
}