# Java program to convert number from Decimal to Binary

This program will convert integer (Decimal) number to its equivalent Binary Number.
There are two programs:
1) Without using any predefine method and
2) Using Integer.toBinaryString() method.

## Without using any predefine method

```//java program to convert decimal to binary

import java.util.*;

public class ConvDec2Bin {
public static void main(String args[]) {
int num, counter = 0;
Scanner sc = new Scanner(System.in);

System.out.print("Enter any integer number: ");
num = sc.nextInt();

//to store maximum 32 bits of a number
int binaryVal[] = new int[32];

while (num > 0) {
binaryVal[counter++] = num % 2;
num = num / 2;
}

/*print binary values stored in binaryVal*/
for (int i = counter - 1; i >= 0; i--) {
System.out.print(binaryVal[i]);
}
}
}
```

Output:

```Complie 	:	javac ConvDec2Bin.java
Run		:	java ConvDec2Bin
Output
Enter any integer number: 12345
11000000111001
```

## Using Integer.toBinaryString() method

```//java program to convert decimal to binary

import java.util.*;

public class ConvDec2Bin {
public static void main(String args[]) {
int num;
Scanner sc = new Scanner(System.in);

System.out.print("Enter any integer number: ");
num = sc.nextInt();

String str = Integer.toBinaryString(num);
System.out.println("Binary number is : " + str);
}
}
```

Output:

```Complie 	:	javac ConvDec2Bin.java
Run		:	java ConvDec2Bin
Output
Enter any integer number: 12345
Binary number is : 11000000111001
```

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