Java Exercises: Convert a decimal number to octal number
Java Basic: Exercise-21 with Solution
Write a Java program to convert a decimal number to octal number.
Decimal number: The decimal numeral system is the standard system for denoting integer and non-integer numbers. It is also called base-ten positional numeral system.
Octal number: The octal numeral system is the base-8 number system, and uses the digits 0 to 7.
Pictorial Presentation: Decimal to Octal number

Sample Solution:
Java Code:
import java.util.Scanner;
public class Exercise21 {
public static void main(String args[])
{
int dec_num, rem, quot, i=1, j;
int oct_num[] = new int[100];
Scanner scan = new Scanner(System.in);
System.out.print("Input a Decimal Number: ");
dec_num = scan.nextInt();
quot = dec_num;
while(quot != 0)
{
oct_num[i++] = quot%8;
quot = quot/8;
}
System.out.print("Octal number is: ");
for(j=i-1; j>0; j--)
{
System.out.print(oct_num[j]);
}
System.out.print("\n");
}
}
Sample Output:
Input a Decimal Number: 15 Octal number is: 17
Flowchart:

Java Code Editor:
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Previous: Write a Java program to convert a decimal number to hexadecimal number.
Next: Write a Java program to convert a binary number to decimal number.
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Java: Tips of the Day
getEnumMap
Converts to enum to Map where key is the name and value is Enum itself.
public static <E extends Enum<E>> Map<String, E> getEnumMap(final Class<E> enumClass) { return Arrays.stream(enumClass.getEnumConstants()) .collect(Collectors.toMap(Enum::name, Function.identity())); }
Ref: https://bit.ly/3xXcFZt
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