# Decimal to Octal Program in Java

## Convert Decimal to Octal Program in Java

There are two way to convert decimal number into octal number, which is given below;

• Using predefined method Integer.toOctalString(int num)
• Writing our own logic for conversion

## Convert Decimal to Octal in Java

```import java.util.Scanner;
class DecimalToOctal
{
public static void main(String args[])
{
Scanner input = new Scanner( System.in );
System.out.print("Enter a decimal number : ");
int num =input.nextInt();

String octalString = Integer.toOctalString(num);
System.out.println("Method 1: Decimal to octal: " + octalString);

}
}
```

## Output

```Enter a decimal number : 123
Decimal to octal: 173
```

### Code Explanation

Using predefined method toOctalString(int) Pass the decimal number to this method and it would return the equivalent octal number.

## Convert Decimal to Octal in Java

```import java.util.Scanner;

class DecimalToOctal
{
public static void main(String args[])
{
Scanner input = new Scanner( System.in );
System.out.print("Enter a decimal number : ");
int num =input.nextInt();

// For storing remainder
int rem;

// For storing result
String str="";

// Digits in Octal number system
char dig[]={'0','1','2','3','4','5','6','7'};

while(num>0)
{
rem=num%8;
str=dig[rem]+str;
num=num/8;
}
System.out.println("Decimal to octal: "+str);
}
}
```

## Output

```Enter a decimal number : 123
Decimal to octal: 173
```

## Syntax

```for compile -> c:/>javac DecimalToOctal.java
for run -> c:/>java DecimalToOctal
```