# include <stdio.h>

//
//  Program 6.9, Stephen Kochan, Programming in C.
//

int main ( void )
{
  float value1, value2;
  char operator;

  printf ( "Type in your expression.\n" );
  scanf ( "%f %c %f", &value1, &operator, &value2 );

  switch ( operator )
  {
    case '+':
      printf ( "%f + %f = %f\n", value1, value2, value1 + value2 );
      break;
    case '-':
      printf ( "%f - %f = %f\n", value1, value2, value1 - value2 );
      break;
    case '*':
      printf ( "%f + %f = %f\n", value1, value2, value1 * value2 );
      break;
    case '/':
      if ( value2 == 0 )
      {
        printf ( "%f / %f is not defined!\n", value1, value2 );
      }
      else
      {
        printf ( "%f / %f = %f\n", value1, value2, value1 / value2 );
      }
      break;
    default:
      printf ( "The operator \"%c\" was not recognized!\n", operator );
      break;
  }

  return 0;
}