C/C++ 程序制作一个简单的计算器?


一个简单的计算器是一个可以执行一些基本操作(例如“+”、“-”、“*”、“/”)的计算器。一个计算器能够快速地执行基本操作。我们将使用 switch 语句来制作一个计算器。

示例

Operator  ‘+’ => 34 + 324 = 358
Operator  ‘-’ => 3874 - 324 = 3550
Operator  ‘*’ => 76 * 24 = 1824
Operator  ‘/’ => 645/5 = 129

示例代码

#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:
         // If the operator is other than +, -, * or /, error message is shown
         cout << "Error! operator is not correct";
      break;
   }
   return 0;
}

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输出

The operator is +
a = 63 b = 7
Sum of63 and 7 is 70

更新日期: 2019 年 7 月 30 日

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