Question

How to convert binary number to decimal in Java

Answer 1

public class MyClass {
    public static void main(String args[]) {
        String s = "10101011"; 
        
        int dec = Integer.parseInt(s, 2); 

        System.out.println(dec);
    }
}



/*
run:

171

*/

 

70+ SQL courses for beginners and professionals

Answer 2

public class MyClass {
    public static int binary_to_decimal(String s) { 
        int dec = 0;
 
        for (int i = s.length() - 1, j = 0; i >= 0; i--, j++) { 
            if (s.charAt(i) == '1') {
                dec += Math.pow(2, j); 
            }
        } 

        return dec; 
    } 

    public static void main(String args[]) {
        String s = "10101011"; 
        
        int dec = binary_to_decimal(s); 

        System.out.println(dec);
    }
}



/*
run:

171

*/

 

70+ SQL courses for beginners and professionals

Answer 3

public class MyClass {
    public static long binary_to_decimal(long binaryNumber) { 
        long decimalNumber = 0;
        int i = 1, reminder = 0;
   
        while (binaryNumber != 0) {
            reminder = (int)binaryNumber % 10;
            decimalNumber += reminder * i;
            i = i * 2;
            binaryNumber = binaryNumber / 10;
        }

        return decimalNumber; 
    } 
 
    public static void main(String args[]) {
        long binaryNumber = 10011;
         
        long dec = binary_to_decimal(binaryNumber); 
 
        System.out.println(dec);
    }
}
 
 
 
/*
run:
 
19
 
*/

 

70+ SQL courses for beginners and professionals