while循环实现十进制转二进制

#include <stdio.h>
int main(void){
	int a,n;
	printf("pls input number:\n");
	scanf("%d",&a);
	n = sizeof(a);
	
	int i,c=0;
	char j[8];
	i = a/2;
	while(i!=0){
		j[c]= a%2;
		a = a/2;
		c = c+1;
	}
	while(c>0){
		printf("%d",j[--c]);
	}
	return 0;
}