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HexToOct.java

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package Conversions;

import java.util.Scanner;

/**

* Converts any Hexadecimal Number to Octal

* @author Tanmay Joshi

public class HexToOct {

/**

* This method converts a Hexadecimal number to a decimal number

* @param s The Hexadecimal Number

* @return The Decimal number

public static int hex2decimal(String s) {

String str = "0123456789ABCDEF";

s = s.toUpperCase();

int val = 0;

for (int i = 0; i < s.length(); i++) {

char a = s.charAt(i);

int n = str.indexOf(a);

val = 16 * val + n;

}

return val;

}

/**

* This method converts a Decimal number to a octal number

* @param q The Decimal Number

* @return The Octal number

public static int decimal2octal(int q) {

int now;

int i = 1;

int octnum = 0;

while (q > 0) {

now = q % 8;

octnum = (now * (int) (Math.pow(10, i))) + octnum;

q /= 8;

i++;

}

octnum /= 10;

return octnum;

}

/**

* Main method that gets the hex input from user and converts it into octal.

* @param args arguments

public static void main(String args[]) {

String hexadecnum;

int decnum, octalnum;

Scanner scan = new Scanner(System.in);

System.out.print("Enter Hexadecimal Number : ");

hexadecnum = scan.nextLine();

// first convert hexadecimal to decimal

decnum = hex2decimal(hexadecnum); //Pass the string to the hex2decimal function and get the decimal form in variable decnum

// convert decimal to octal

octalnum = decimal2octal(decnum);

System.out.println("Number in octal: " + octalnum);

}