UVa – 10931 – Parity

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char s[33];
int main() {
	for (int N = 0; (scanf("%d", &N) == 1) && N && itoa(N, s, 2);) {
		printf("The parity of %s is %d (mod 2).\n", s, __builtin_popcount(N));
	}
	return 0;
}
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