不管输什么都是0
#include <stdio.h>
#include <stdlib.h>
int main()
{
float value1,value2,result;
char op;
printf("input value1、op、value2");
scanf("%.2f%c%.2f ",&value1,&op,&value2);
switch(op)
{
case '+':("result=value1+value2"); break;
case '-':("result=value1-value2");break;
case '':("result=value1value2"); break;
case '/':("result=value1/value2");
}
printf("%.2f%c%.2f=%d",value1,op,value2,result);
return 0;
}