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
