Convert decimal to binary numbers

#include <stdio.h>

int main()
{
    int n, c, k;

    printf("Enter an integer in decimal number system\n");
    scanf("%d", &n);

    printf("%d in binary number system is:\n", n);

    for (c = 31; c >= 0; c--)
    {
        k = n >> c;
        if (k & 1)
        {
            printf("1");
        }
        else
        {
            printf("0");
        }
    }

    printf("\n");

    return 0;
}

Output : 

Enter an integer in decimal number system
6
6 in binary number system is:
00000000000000000000000000000110