hexaunddec

package lab.pkg7;
import java.util.*;

public class Lab7 {

//John Semanduyev                                     Due December 11, 2018
//CISC 1115 TR11                                                      LAB 7

    //method converts hexadecimal to decimal using string as reference
    public static int Hex2Dec(String input) {
        String ref= "0123456789ABCDEF";
        int num=0;
        for (int i=0;i<input.length();i++) {
            char a = input.charAt(i);
            int b= ref.indexOf(a);
            num=16*num+b;
        }
        return num;
    }

    //method converts decimal to hexadeciml using array as reference
    public static void Dec2Hex(int z) {
        char[] hexadecimal= {'0','1','2','3','4','5','6','7','8','9','A','B','C'
        ,'D','E','F'};
        int rem=0;
        String value = "";
        while (z>0) {
            rem=z%16;
            value=hexadecimal[rem]+value;
            z=z/16;
        }
        System.out.println("The hexadecimal value is " +value);
    }

    //main program puts it all together and displays everything
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        char s; String in; int num; String holder;
        do{
            System.out.println("Enter a string to convert from "
                    + "hexadecimal to decimal");
            in =input.nextLine();
            System.out.println("The decimal value is " + Hex2Dec(in));
            System.out.println("Enter a number to convert from"
                    + " decimal to hexadecimal");
            num=input.nextInt();
            Dec2Hex(num);
            System.out.println("Enter 's' to go again, any other "
                    + "character to end");
            s=input.next().charAt(0);
            holder=input.nextLine();
        }while(s!='s');
    }
}

/*
run:
Enter a string to convert from hexadecimal to decimal
16A
The decimal value is 362
Enter a number to convert from decimal to hexadecimal
362
The hexadecimal value is 16A
Enter 's' to go again, any other character to end
f
Enter a string to convert from hexadecimal to decimal
16A
The decimal value is 362
Enter a number to convert from decimal to hexadecimal
362
The hexadecimal value is 16A
Enter 's' to go again, any other character to end
f
Enter a string to convert from hexadecimal to decimal
6754A
The decimal value is 423242
Enter a number to convert from decimal to hexadecimal
423242
The hexadecimal value is 6754A
Enter 's' to go again, any other character to end
*/