#include "pch.h" #include<iostream>
using namespace std; const float PI = 3.1415926; int main() { int iType; float readius, a, b; while (true){ cout << "圖形的類型為？(1-圓形 2-長方形 3-正方形)"; cin >> iType; switch (iType) { case 1: cout << "請輸入圓形的直徑"; cin >> readius; cout << "圓的面積為" << readius * PI << "平方厘米" << endl; break; case 2: cout << "矩形的長為:"; cin >>a; cout << "矩形的寬位"; cin >> b; cout << "矩形的面積為:" << a * b << "平方厘米" << endl; break; case 3: cout << "請輸入正方形的邊長"; cin >> a; cout << "正方形面積為" << a * a << "平方厘米" << endl; } } }