Binary to Decimal in C program

//Binary to Decimal in C program
#include <stdio.h>

main()

{

    int  num, binary_val, decimal_val = 0, base = 1, rem;

    printf("Enter a binary number(1s and 0s) \n");

    scanf("%d", &num); /* maximum five digits */

    binary_val = num;

    while (num > 0)

    {

        rem = num % 10;

        decimal_val = decimal_val + rem * base;

        num = num / 10 ;

        base = base * 2;

    }

    printf("The Binary number is = %d \n", binary_val);

    printf("Its decimal equivalent is = %d \n", decimal_val);

}