#include <stdio.h>

void dec2bin(int num)
{
    if (num>0)
    {
        dec2bin(num/2);
        printf ("%d", num%2);
    }
}

int main ()
{
	int num=0;
	printf("Zahl eingeben: ");
	scanf("%d", &num);

	dec2bin(num);

        return 0;
}