用C语言编写一个简单的可以进行加减乘除运算混合运算的计算器的方法：

# 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;}

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