# Java program to convert number from Decimal to Octal

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

## Without using any predefine method

```// java program to convert decimal to octal

import java.util.*;

public class ConvDec2Oct {
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 digits
int octalVal[] = new int[32];

while (num > 0) {
octalVal[counter++] = num % 8;
num = num / 8;
}

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

Output:

```Complie 	:	javac ConvDec2Oct.java
Run		:	java ConvDec2Oct
Output
Enter any integer number: 12345
30071
```

## Using Integer.toOctalString() method

```//java program to convert decimal to octal

import java.util.*;

public class ConvDec2Oct {
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.toOctalString(num);
System.out.println("Octal number is : " + str);
}
}
```

Output:

```Complie 	:	javac ConvDec2Oct.java
Run		:	java ConvDec2Oct
Output
Enter any integer number: 12345
Octal number is : 30071
```

Preparation

What's New

Top Interview Coding Problems/Challenges!