C 语言实例 _ 实现简单的计算器

C 语言实例 C 语言实例

实现加减乘除计算。

实例

# include <stdio.h>
 
int main() {
 
 char operator;
 double firstNumber,secondNumber;
 
 printf("输入操作符 (+, -, *,): ");
 scanf("%c", &operator);
 
 printf("输入两个数字: ");
 scanf("%lf %lf",&firstNumber, &secondNumber);
 
 switch(operator)
 {
 case '+':
 printf("%.1lf + %.1lf = %.1lf",firstNumber, secondNumber, firstNumber + secondNumber);
 break;
 
 case '-':
 printf("%.1lf - %.1lf = %.1lf",firstNumber, secondNumber, firstNumber - secondNumber);
 break;
 
 case '*':
 printf("%.1lf * %.1lf = %.1lf",firstNumber, secondNumber, firstNumber * secondNumber);
 break;
 
 case '/':
 printf("%.1lf / %.1lf = %.1lf",firstNumber, secondNumber, firstNumber / secondNumber);
 break;
 
 // operator doesn't match any case constant (+, -, *, /)
 default:
 printf("Error! operator is not correct");
 }
 
 return 0;
}

输出结果为:

输入操作符 (+, -, *,): *
输入两个数字: 4 5
4.0 * 5.0 = 20.0

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