用C / C ++程序制作一个简单的计算器？
简单的计算器是执行一些基本操作的计算器，例如“+”，“-”，“*”，“/”。计算器可以快速执行基本操作。我们将使用switch语句制作一个计算器。
示例
Operator − ‘+’ => 34 + 324 = 358 Operator − ‘-’ => 3874 - 324 = 3550 Operator − ‘*’ => 76 * 24 = 1824 Operator − ‘/’ => 645/5 = 129
范例程式码
#include <iostream<
using namespace std;
int main() {
char op = '+';
float a = 63, b= 7;
// cout << "Enter operator either + or - or * or /: ";
// cin >> op;
cout<<"The operator is "<<op<<endl;
// cout << "Enter two operands: ";
// cin>> a >> b;
cout<<"a = "<<a<<" b = "<<b<<endl;
switch(op) {
case '+':
cout <<"Sum of"<<a<<"and"<<b<<"is"<< a+b;
break;
case '-':
cout <<"Difference of"<<a<<"and"<<b<<"is"<<a-b;
break;
case '*':
cout <<"Product of"<<a<<"and"<<b<<"is"<<a*b;
break;
case '/':
cout <<"Division of"<<a<<"and"<<b<<"is"<<a/b;
break;
default:
//如果运算符不是+，-，*或/，则显示错误消息
cout << "Error! operator is not correct";
break;
}
return 0;
}输出结果
The operator is + a = 63 b = 7 Sum of63 and 7 is 70