C: 整数を2進数に変換して表示！

gistfile1.c

#include <stdio.h>

void main() {
	int input;
	int bit;
	int show;
	int i;

	while (1) {
		printf(">> ");
		scanf("%d", &input);

		show = 0;
		for (i = sizeof(int) * 8 - 1; i > -1; i--) {
			bit = (input & (1 << i)) >> i;
			if (!show && bit == 1) show = 1;
			if (show) printf("%d", bit);
		}
		puts("");
	}
}