/*
 * Program to demonstrate using array and "for".
 */
#include <stdio.h>

void print_array(int sz, int a[]);

#define N 6

/* main program */
int main(void) {

	/* declare/create array */
	int num[N];
	/* initialize array */
	for (int i = 0; i < N; ++i) {
		num[i] = i+1;
	}
	print_array(N, num);

	printf("enter index\n");
	int index;
	if (scanf("%d", &index) != 1) { printf("error\n"); return 1; }
	/* should check for index < 0 or >= N here!! */
	num[index] = -1;
	print_array(N, num);
	return 0;


}

void print_array(int sz, int a[]) {
	for (int i = 0; i < sz; ++i) {
		printf("elem %d is %d\n", i, a[i]);
	}
}