Java Example program convert Decimal to Binary

• We can convert binary to decimal in three ways
  1.Using Integer.toBinaryString(int num);
  2.Using Stack
  3.Using Custom logic 

1.Write a Java Program to convert decimal to binary in java using Integer.toBinaryString(int num)

1. import java.util.Scanner;
2. public class ConvertDecimalToBinary{
3.  
4.     /**
5.      *www.instanceofjava.com
6.      */
7.  
8.  public static void main(String[] args) {
9.         
10.  System.out.println("\nBinary representation of 1: ");
11.  System.out.println(Integer.toBinaryString(1));
12.  System.out.println("\nBinary representation of 4: ");
13.  System.out.println(Integer.toBinaryString(4));
14.  System.out.println("Binary representation of 10: ");
15.  System.out.println(Integer.toBinaryString(10));
16.  System.out.println("\nBinary representation of 12: ");
17.  System.out.println(Integer.toBinaryString(12));
18.  System.out.println("\nBinary representation of 120: ");
19.  System.out.println(Integer.toBinaryString(120));
20.  System.out.println("\nBinary representation of 500: ");
21.  System.out.println(Integer.toBinaryString(500));
22. 
    
23. }
24.  
25. }

Output:

1. Binary representation of 1: 
2. 1
3. Binary representation of 4: 
4. 100
5. Binary representation of 10: 
6. 1010
7. Binary representation of 12: 
8. 1100
9. Binary representation of 120: 
10. 1111000
11. Binary representation of 500: 
12. 111110100

2.Write a Java Program to convert decimal to binary in java

1. import java.util.Scanner;
2. import java.util.Stack;
3. public class ConvertDecimalToBinary{
4.  
5.     /**
6.      *www.instanceofjava.com
7.      */
8.  
9.  
10.  public static void main(String[] args) {
11.         
12. Scanner in = new Scanner(System.in);
13.          
14. // Create Stack object
15. Stack<Integer> stack = new Stack<Integer>();
16.      
17. //Take  User input from keyboard
18.  System.out.println("Enter decimal number: ");
19.  int num = in.nextInt();
20.     
21. while (num != 0)
22. {
23.    int d = num % 2;
24.    stack.push(d);
25.    num /= 2;
26.  
27.  } 
28.      
29.  System.out.print("\nBinary representation is:");
30.  
31. while (!(stack.isEmpty() ))
32.  {
33.    System.out.print(stack.pop());
34.  }
35.         
36.  
37. System.out.println();
38.  
39. }
40.  
41. }
42.  
43. }

Output:

1. Enter decimal number: 
2. 12
3.  
4. Binary representation is:1100

3.Write a Java Program to convert decimal to binary in java

1. import java.util.Scanner;
2. public class ConvertDecimalToBinary{
3.  
4.     /**
5.      *www.instanceofjava.com
6.      */
7.  
8. public static void convertDeciamlToBinary(int num){
9.  
10.   int binary[] = new int[40];
11.          int index = 0;
12.  while(num > 0){
13.            binary[index++] = num%2;
14.            num = num/2;
15.  }
16. 
    
17. for(int i = index-1;i >= 0;i--){
18.            System.out.print(binary[i]);
19. }
20.  
21. }
22.  
23.  public static void main(String[] args) {
24.         
25. System.out.println("Binary representation of 1: ");
26. convertDeciamlToBinary(1);
27.  
28. System.out.println("\nBinary representation of 4: ");
29. convertDeciamlToBinary(4);
30.  
31. System.out.println("\nBinary representation of 10: ");
32. convertDeciamlToBinary(10);
33.  
34. System.out.println("\nBinary representation of 12: ");
35.  convertDeciamlToBinary(12);
36.  
37. }
38.  
39. }

Output:

1. Binary representation of 1: 
2. 1
3. Binary representation of 4: 
4. 100
5. Binary representation of 10: 
6. 1010
7. Binary representation of 12: 
8. 1100

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