Java Program to Count Set Bits using Bitwise Operations

This is a Java Program to Count the Number of Bits set to One.

Enter any decimal number as an input. After that we first convert the given decimal number into binary number and then check at every position for 1. If 1 occurs then we increase the counter by one. Hence at last we get the counter value as the output.

Here is the source code of the Java Program to Count the Number of Bits set to One. The Java program is successfully compiled and run on a Windows system. The program output is also shown below.

```
import java.util.Scanner;
```
```
public class Count_One 
```
```
{
```

    public static void main(String[] args)

```
    {
```
```
        int n, m, count = 0;
```
```
        String x = "";
```

        Scanner s = new Scanner(System.in);

        System.out.print("Enter the Decimal Number:");

```
        n = s.nextInt();
```
```
        while(n > 0)
```
```
        {
```
```
            int a = n % 2;
```
```
            x = a + x;
```
```
            n = n / 2;
```
```
        }
```
```
        int l = x.length();
```
```
        for(int i = 0; i < l; i++)
```
```
        {
```
```
            if(x.charAt(i) == '1')
```
```
            {
```
```
                count++;
```
```
            }
```
```
        }
```

        System.out.println("No. of 1's are:"+count);

```
    }
```
```
}
```

Output:

$ javac Count_One.java
$ java Count_One
 
Enter the Decimal Number:15
No. of 1's are:4

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