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Convert binary value into decimal value

  For binary 100 decimal is 4.

  For binary 10101 decimal is 21

Java

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 import java.util.Scanner;
 public class BinToDec{
     public static void main(String []args){
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter a binary value:");
        int binary = sc.nextInt();
        int decimal = 0, i = 0;
        while(binary!=0){
            decimal += (binary % 10) * (int)Math.pow(2,i);
            i++;
            binary = binary / 10;
        }
        System.out.println("Decimal value:"+decimal);
     }
 }


Python

binary = int(input("Enter a binary value:"))
decimal = i = 0
while binary!=0:
    decimal += (binary%10)*(2**i)
    i += 1
    binary = binary // 10
print("decimal value :",decimal)


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