void tobinary(int x, char s[]);

int main() {
	char hold[4];
	tobinary(5, hold);
	
	return 0;
}



void tobinary(int x, char s[]){
	
	int k=0,n=0;
	int neg=0;
	int sLength=sizeof(s);
	int remain;
	int temp[sLength];
	
	if (x<0) {
		x=-x;
		neg=1;
	}
		
	do {
		remain=x%2;
		x=x/2;
		temp[k++]=remain+'0';
	} while (x >0);

	if(neg) {
		temp[k++]='-';
	}
	else {
		temp[k++]=' ';
	}
	
	while (k>=0) {
		s[n++]=temp[--k];
	}
	
	s[n-1]=0;	

	k=0;
	while (k<4) {
		printf("%d", s[k]);
		k++;
	}

}

sLength=sizeof(s);