C program to convert decimal to binary without using arithmetic operators

The below program ask the user to enter the decimal number. After getting the value from the user it will convert the decimal number into a binary number.

#include <stdio.h>
#define CHAR_BITS  8  // size of character
#define INT_BITS  (sizeof(int) * CHAR_BITS)
int main()
{
    int num, index, i;
    int bin[INT_BITS] = {0};
    printf("Enter decimal number: ");
    scanf("%d", &num);
    //Array Index for binary number
    index = (INT_BITS - 1);
    while(index >= 0)
    {
        // to get the last binary digit of the number 'num'
        // and accumulate it at the beginning of 'bin'
        bin[index] = (num & 1);
        //Decrement index
        index--;
        //Right Shift num by 1
        num >>= 1;
    }
    //Display converted binary on the console screen
    printf("Converted binary is: ");
    for(i=0; i<INT_BITS; i++)
    {
        printf("%d", bin[i]);
    }
    return 0;
}

Output:

Enter decimal number: 12

Converted binary is: 00000000000000000000000000001100