/*
 * program to show a legitimate use of %n
 */
#include <stdio.h>
#include <stdlib.h>

/*
 * here's the main program -- read in a
 * number and print it and the number of
 * digits in it
 */
int main(int argc, char *argv[])
{
	int a;		/* input number */
	int n;		/* width of a */
      
	/* prompt for an integer and catch errors */
	printf("Enter an integer> ");
	if (scanf("%d%n", &a, &n) != 1){
		fprintf(stderr, "%s: bad input value\n", argv[0]);
		return(1);
	}
	
	/* print the number and the width */
    printf("Number: %d; number of digits: %d\n", a, n);
}