#include <stdio.h>
#include <stdlib.h>
int main(int argc,char *argv[])
{
float x,y;
char ch;
float result;
if(argc !=4 )
{
printf("Input error,end.\n");
exit(1);
}
x=atof(argv[1]);
y=atof(argv[3]);
ch=argv[2][0];
switch (ch)
{
case '+':
result = x+y;
break;
case '-':
result = x-y;
break;
case '*':
result = x*y;
break;
case '/':
if(y==0)
{
printf("ERROR:Zero donominstor.\n");
exit(-1);
}
result = x/y;
break;
default:
printf("ERROR:Operator over bound.\n");
exit(-2);
}
printf("%f%c%f=%f\n",x,ch,y,result);
return 0;
}