用switch语句实现多分支结构

#include <stdio.h>int main(){    float a,b;    char c;    printf("Please enter a,b and op:");    scanf("%f%c%f",&a,&c,&b);    switch(c)    {    case '+':        printf("%f+%f=%f\n",a,b,a+b);        break;    case '-':        printf("%f-%f=%f\n",a,b,a-b);        break;    case '*':        printf("%f*%f=%f\n",a,b,a*b);        break;    case '/':        if(b!=0.0)             printf("%f/%f=%f\n",a,b,a/b);        else            printf("error!\n");        break;    default:        printf("error!\n");        break;    }    return 0;}