Statement C Tutorial

#include 
#include 
int main(void)
{
  double number1 = 3.0;
  double number2 = 4.0;
  char operation = '+';
  char reply = 0;      
  switch(operation)
  {
    case '+':                    
      printf("= %lf\n", number1 + number2);
      break;
    case '-':                    
      printf("= %lf\n", number1 - number2);
      break;
    case '*':                    
      printf("= %lf\n", number1 * number2);
      break;
    case '/':
      if(number2 == 0)           
        printf("\n\n\aDivision by zero error!\n");
      else
        printf("= %lf\n", number1 / number2);
       break;
    case '%':                    
      if((long)number2 == 0)
        printf("\n\n\aDivision by zero error!\n");
      else
        printf("= %ld\n", (long)number1 % (long)number2);
      break;
    default:                     
      printf("\n\n\aIllegal operation!\n");
      break;
  }
  return 0;
}
= 7.000000