I need a program in java using 2 methods, named decimalToHex and toHexChar. The

Question

I need a program in java using 2 methods, named decimalToHex and toHexChar. The first method decimalToHex will recieve an integer value from main method and build the hexadecimal string. It will utilize the second method toHexChar to convert an integer to a single hex digit in a character. Include  notes/comments that explain each block of code!

Remember the Hexadecimal digits are 0 1 2 3 4 5 6 7 8 9 A B C D E F

Where a decimal 10=A, 11=B, 12=C, 13=D,14=E,15=F.

A Hexadecimal value of decimal 123 is 7B.

This problem will use modulus operator %. For example,

123 % 16 = 11 ---> B and 123/16=7

7 % 16 = 7----> 7 and 7/16=0 and we stop.

hence decimal 123 --->hexadecimal 7b

Sample Run/OUTPUT:

Enter a number (or -1 to exit): 123

The hexadecimal of 123 is 7B.

Enter a number (or -1 to exit): -1

Thank you!

The program will need to include 2 additional methods outside of the main()

method as below:

Method: Signature:

decimalToHex public static String decimalToHex(int decimal)

toHexChar public static char toHexChar(int hexValue)

Explanation / Answer

import java.util.*;
public class test
{
public static String decimalToHex(int decimal)
{
StringBuilder ans = new StringBuilder("");
while(decimal!=0)
{
ans.append(toHexChar(decimal%16));
decimal = decimal/16;
}
return ans.reverse().toString();
}
public static char toHexChar(int hexValue)
{
switch(hexValue)
{
case 1: return '1';
case 2: return '2';
case 3: return '3';
case 4: return '4';
case 5: return '5';
case 6: return '6';
case 7: return '7';
case 8: return '8';
case 9: return '9';
case 10: return 'A';
case 11: return 'B';
case 12: return 'C';
case 13: return 'D';
case 14: return 'E';
case 15: return 'F';
}
return ' ';
}
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
int number = 0;
System.out.println("Enter a number (or -1 to exit): ");
number = in.nextInt();
while(number!=-1)
{
System.out.println("The hexadecimal of " + number + " is " + decimalToHex(number));
System.out.println("Enter a number (or -1 to exit): ");
number = in.nextInt();
}
System.out.println("Thank you!");
}
}

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