c语言 用switch语句写个加、减、乘、除法的计算器程序答:include <stdio.h> int main(){ double m,n,result;char a;printf("Please input two number as a,b:");scanf("%lf%c%lf",&m,&a,&n);switch(a){ case '+':printf("%lf%c%lf=%lf",m,a,n,m+n);break;case '-':printf("%lf%c%lf=%lf",m,a,n,m-n);break;case '...