Description

Convert the given decimal number into an equivalent octal number means
convert the number with base value 10 to base value 8.

C/C++

/* C Program to convert Decimal to Octal */
//Save it as ConvertDecimalToOctal.c

#include<stdio.h>
int main(){

    int dec, rem, octalNum=0, count=1;

    printf("Enter a decimal number : ");
    scanf("%d", &dec);

    //Storing the decimal value to temporary variable
    int temp = dec;

    while(dec != 0) {

        //Calculation of remainder
        rem = dec % 8;

        //Calculation of octal value
        octalNum += (rem * count);

        // storing exponential value
        count *= 10;

        dec /= 8;
    }

    //Restoring the decimal value
    dec = temp;

    printf("The Octal value of %d is %d", dec, octalNum);

    return 0;
}

Input:
Enter a decimal number : 19

Output:
The octal of 19 is 23

Java

/* Java Program to convert Decimal to Octal */
//Save it as ConvertDecimalToOctal.java

import java.io.*;
import java.util.Scanner;

public class ConvertDecimalToOctal {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        
        System.out.println("Enter a decimal number : ");
        int dec = scanner.nextInt();
        
                //Storing the decimal value to temporary variable
        int temp = dec;
        
        int rem, octalNum=0, count=1;
        
        while(dec != 0) {
            
                        //Calculation of remainder
            rem = dec % 8;
            
                        //Calculation of octal value
            octalNum += (rem * count);
            
                        // storing exponential value
            count *= 10;
            
            dec /= 8;
        }
        
                //Restoring the decimal value
        dec = temp;
        
        System.out.println("The octal of " + dec + " is "+ octalNum);
        
        
        /* 
            There is predefined function in Java to convert decimal to octal
            Integer.toOctalString(decimalNumber)
        */
        
    }
}

Input:
Enter a decimal number : 
19

Output:
The octal of 19 is 23

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