Binary to Decimal converter. C

#include <stdio.h>  
#include <conio.h>  
void main()  
{  

    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);
  
    binary_num = num;   
      
      
    while ( num > 0)  
    {  
        rem = num % 10;  
        decimal_num = decimal_num + rem * base;  
        num = num / 10;   
        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();  
}