#include <stdio.h>

int main()
{
   char f;
   float a, b, c;

   scanf("%f%c%f", &a, &f, &b);

   switch(f) {
   case '+':
      c=a+b;
      break;
   case '-':
      c=a-b;
      break;
   case '*':
      c=a*b;
      break;
   case '/':
      c=a/b;
   default:
      printf("You what?\n");
      return(0);
   }

   printf("Your answer is: %f", c);
   return(0);

}

marc@dhcppc3:~/Documents/c> ./calc
9
+
You what?
marc@dhcppc3:~/Documents/c>

it's a stupid calculator! NOOB