7(viii)

#include <stdio.h>
int deci_to_bin(int n)
{
    if (n == 0)
        return 0;
    else
        return ((n % 2) + 10 * deci_to_bin(n / 2));
}
void main()
{
    int num;

    printf("Enter the number: ");
    scanf("%d", &num);
    printf("%d = %d", num, deci_to_bin(num));
}