Description

To convert binary to decimal, extract rightmost digits from binary number and
multiply the digit with the proper base (Power of 2) and add it to the variable. At the
end, the variable will store the required decimal number.

C/C++

/* C Program to convert Binary to Decimal */
//Save it as ConvertBinaryToDecimal.c

#include<stdio.h>
int main(){

    int bin, rem, dec = 0, count=0;

    printf("Enter a binary Number : ");
    scanf("%d",&bin);

    //Storing the value of binary to temporary variable
    int temp = bin;

    while(bin > 0) {

        rem = bin % 10;

        dec += (rem * pow(2,count));

        bin /= 10;

        count++;
    }

    //Restoring the binary variable
    bin = temp;

    printf("The decimal of %d is %d", bin, dec);

    return 0;
}

Input:
Enter a binary Number : 11010

Output:
The decimal of 11010 is 26

Java

/* Java Program to convert Binary to Decimal */
//Save it as ConvertBinaryToDecimal.java

import java.io.*;
import java.util.Scanner;
public class ConvertBinaryToDecimal {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        
        System.out.println("Enter a binary Number : ");
        int bin = scanner.nextInt();
        
        //Storing the value of binary to temporary variable
        int temp = bin;
        
        int rem, dec = 0, count=0;
        
        while(bin > 0) {
            
            rem = bin % 10;
            
            dec += (rem * Math.pow(2,count));
            
            bin/=10;
            
            count++;
        }
        
        //Restoring the binary variable
        bin = temp;
        
        System.out.println("The decimal of "+ bin + " is "+ dec);
    }
}

Input:
Enter a binary Number : 
11010

Output:
The decimal of 11010 is 26

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