用switch语句编程设计一个简单的计算器程序答:include <stdio.h> int main( ){ double a, b;char op;scanf("%lf%c%lf", &a, &op, &b);switch (op){ case '+':printf("%lf + %lf = %lf\n", a, b, a + b);break;case '-':printf("%lf - %lf = %lf\n", a, b, a - b);break;case '*':printf("%...