Enter any integer as an input. Now we convert the given decimal input into a binary number with the help of division and modulus operations along with loops and if conditions to get the desired output.
Here is the source code of the Java Program to Convert a Decimal Number to Binary & Count the Number of 1s. The Java program is successfully compiled and run on a Windows system. The program output is also shown below.
public class Convert
public static void main(String args)
int n, count = 0, a;
String x = "";
Scanner s = new Scanner(System.in);
System.out.print("Enter any decimal number:");
n = s.nextInt();
while(n > 0)
a = n % 2;
if(a == 1)
x = a + "" + x;
n = n / 2;
System.out.println("No. of 1s:"+count);
$ javac Convert.java $ java Convert Enter any decimal number:25 Binary number:11001 No. of 1s:3
Sanfoundry Global Education & Learning Series – 1000 Java Programs.