Adding convertions

Code:

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package syfah;
import java.util.Scanner;

public class Adding{
          public static int convert(char c){
                      if(c == 'A') return 10;
                      else if(c == 'B') return 11;
                      else if(c == 'C') return 12;
                      else if(c == 'D') return 13;
                      else if(c == 'E') return 14;
                      else if(c == 'F') return 15;
                    return c;
                }
    public static void main(String [] args){
        Scanner kbd = new Scanner(System.in);

        System.out.print("Enter How many Numbers to be added: ");
        int inputting = Integer.parseInt(kbd.next());
        String [] num = new String[inputting];
        int []x = new int[inputting];
        int a = 0;
        int ans= 0;
        int z = 0;
       
        for(int i = 0; i<inputting; i++){
          System.out.print("Enter Number "+(i+1) + ": ");
            num[i]= kbd.next();
           
            int l = num[i].length();
            int v = 0;
            for(int j = l-1; j>=0; j--){
                if(Character.isLetter(num[i].charAt(v))){
                    a = convert(num[i].charAt(v));
                }
                  else
                    a = Integer.parseInt(Character.toString(num[i].charAt(v)));
                z = z + (a*(int)Math.pow(x[i], j));
                v++;
            }
          ans = ans + z;
            z = 0;
        }
        System.out.print("Enter Base of Sum: ");
        int Lastbase = Integer.parseInt(kbd.next());
        int x2 = ans;
        int t = 0;
        String LastAns = "";
        if( Lastbase >= 10){
            while(x2 != 0){
                t = x2% Lastbase;
                x2 = x2/ Lastbase;
                if(t >= 10){
                  if(t == 10)
                        LastAns = "A" + LastAns;
                    else if(t == 11)
                        LastAns = "B" + LastAns;
                    else if(t == 12)
                        LastAns= "C" + LastAns;
                    else if(t == 13)
                        LastAns = "D" + LastAns;
                    else if(t == 14)
                        LastAns = "E" + LastAns;
                    else if(t == 15)
                        LastAns = "F" + LastAns;
                }
                else
                    LastAns = Integer.toString(t) +LastAns;
            }
        }
        else{
            while(x2 != 0){
                t = x2% Lastbase;
                x2 = x2/ Lastbase;
              LastAns = Integer.toString(t) + LastAns;
            }
        }
        String output = "Summation of the Following Numbers:";
        for(int i = 0; i < inputting; i++){
            output = output +"\n"+num[i]+" base "+x[i];
        }
        output = output+"\nSum = "+LastAns;
      System.out.println(output+" with base "+ Lastbase);
    }


}

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Problems:

1. well i know how to put restriction that the user should only input not less than 2 and not more than 16 as base but my problem is how can i implement it inside my code.

2. how can i edit my code that it will ask the base of the first number to be inputted
and checks if its valid

ex.
i input originalbase of: 2
so if i inputted 1st number to be added like this: 10129223
it will make the user to input a new 1st number to be added to the 2nd and so on.

or simply it check if it matches the base inputted.

the desired out put is kinda like this:

Code:

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Enter How many Numbers to be added: 3
Enter Number 1: f5
Enter Original Base: 1: 16
<--- and so on ---->

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Quote:

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input not less than 2 and not more than 16 as base but my problem is how can i implement it inside my code.

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You can do that with an if(condition) test. where the condition tests if the number is in the correct range.

Quote:

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how can i edit my code that it will ask the base of the first number to be inputted and checks if its valid

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Why can't you do just that:
Ask for a number
check if the number if valid

Then what if its not valid?

ok let me first fix it step by step here..
i already coded for the restriction of bases entered
to restrict the less than 2 or greater than 16
but somehow i kinda fail

Code:

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int originalBase = -2;
        while(originalBase <2 || originalBase >16){
            for(int i = 0 ; i< inputting; i++){
            System.out.println("Enter Original Base: "+(i+1) + ": ");
            originalBase = Integer.parseInt(kbd.next());
            x[i]= Integer.parseInt(kbd.next());
            if(originalBase <2){
                System.out.println("its too low");
            }else if(originalBase >16){
                System.out.println("its too high");

            }
          System.out.println("Enter Number "+(i+1) + ": ");
            num[i]= kbd.next();
         


            int l = num[i].length();
            int v = 0;
            for(int j = l-1; j>=0; j--){
                if(Character.isLetter(num[i].charAt(v))){
                    a = convert(num[i].charAt(v));
                }
                  else
                    a = Integer.parseInt(Character.toString(num[i].charAt(v)));
                z = z + (a*(int)Math.pow(x[i], j));
                v++;
            }
          ans = ans + z;
            z = 0;
        }
        }

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the output was like this
if i inputted the right one it needs 2x to move to inputting the number to be added

Code:

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Enter How many Numbers to be added:
2
Enter Original Base: 1:
15
15
Enter Number 1:
2321
Enter Original Base: 2:
15
15
Enter Number 2:
2321
Enter Base of Sum:
16
Summation of the Following Numbers:
2321 base 15
2321 base 15
Sum = 3A40 with base 16

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and this is the output if i inputted the wrong one

Code:

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Enter How many Numbers to be added:
2
Enter Original Base: 1:
1
17
its too low
Enter Number 1:

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instead of asking the user again since its too high or too low it goes straight in asking the number to be added
and again it needs to be inputted 2x

Have you tried designing your program using something like a flowchart to work out the logic BEFORE writing the code?
Your problem seems to be a logic problem. You need to work out your logic BEFORE writing the code.
Take a piece of paper and a pencil and design the logic THEN write the code.

Doesn't this thread belong in the 'New To Java' forum? imho radix conversion is CE 101.

kind regards,

Jos