decimal number

#include <stdio.h>  
#include <conio.h>  
void main()  
{  
    // declaration of variables  
    int num, binary_num, decimal_num = 0, base = 1, rem;  
    printf (" Enter a binary number with the combination of 0s and 1s \n");  
    scanf (" %d", &num); // accept the binary number (0s and 1s)  
  
    binary_num = num; // assign the binary number to the binary_num variable  
      
      
    while ( num > 0)  
    {  
        rem = num % 10; /* divide the binary number by 10 and store the remainder in rem variable. */  
        decimal_num = decimal_num + rem * base;  
        num = num / 10; // divide the number with quotient  
        base = base * 2;  
    }  
  
    printf ( " The binary number is %d \t", binary_num); // print the binary number  
    printf (" \n The decimal number is %d \t", decimal_num); // print the decimal   
    getch();  
}