How to convert binary to decimal

Binary to decimal converstion program given code below:

We know that binary digit have only two bit '0' or '1' bit for executing all operatin in computer.

if let have a binary digit : 1011001 

than what will be out of the given binary code in decimal

than follow given code to convert in decimal

#include<stdio.h> #include<conio.h> #include<math.h> // vikasstudyknowledge.blogspot.com void main(){ int decimal=0,weight=0, rem; unsigned long int binary, bin; printf("Enter binary number\n"); scanf("%ld",&binary); bin = binary; while(binary != 0){ rem = binary%10; decimal = decimal + rem*pow(2,weight); binary = binary/10; weight++; } printf("%ld is converted into decimal is : %d",bin,decimal); getch(); }