#include <stdio.h>

void doOption1();
void doOption2();
void doOption3();

int main()
{
  char option, newline ;

  do {
    printf ("Choose one option: \n");
    printf ("    1 - Option 1 \n");
    printf ("    2 - Option 2 \n");
    printf ("    3 - Option 3 \n");
    printf ("    X - Exit program \n");

    option = getchar();
    newline= getchar();

    switch (option)
      {
      case '1' :	doOption1();
			break;
			
      case '2' :	doOption2();
			break;
			
      case '3' :	doOption3();
			break;
			
      case 'x' :
      case 'X' :
			break;
			
      default:		printf("Please enter a valid option. \n");
			break;
      }

  } while (option != 'X' && option != 'x' ) ;

}

void doOption1() {
  printf("Doing Option 1 \n");
  return;
}

void doOption2() {
  printf("Doing Option 2 \n");
  return;
}

void doOption3() {
  printf("Doing Option 3 \n");
  return;
}