/* An input validation loop with do-while */

#include <stdio.h>

int main(void) {
  int number;

  /* Repeated prompting with input validation */
  do {
    printf("Enter a non-negative integer: ");
    scanf("%d", &number);
  } while (number < 0);

  /* Printing the result */
  printf("Here it is: %d\n", number);
 
  return 0;
}