example of function pointers and safe terminal mode input in C

fptrs.c

/*
 * example of function pointers and safe terminal mode input in C
 */

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

typedef void (*printFunc_t) (void);

void firstPit();
void secondPit();
void thirdPit();

int main() {
   printFunc_t funcArray[] = {firstPit, secondPit, thirdPit};
   int userNum = 0;
   bool userNumValid = false;
   int ret;

   do {
      printf("enter a number, 1-3\n");

      if( (ret = fscanf(stdin, "%i", &userNum)) != 1 ) {
         while( !feof(stdin) && (ret = getc(stdin)) != '\n' );
      } else {
         userNumValid = (userNum >= 1 && userNum <= 3);
      }
   } while(!feof(stdin) && !userNumValid);

   if(userNumValid) {
      funcArray[userNum - 1] ();
   }

   return EXIT_SUCCESS;
}


void firstPit() {
   printf("you selected 1\n");
}

void secondPit() {
   printf("you selected 2\n");
}

void thirdPit() {
   printf("you selected 3\n");
}