HELP please!!?! How to make this work?

[amityville9889]

I'm trying to write a program that converts from binary to decimal and vice versa. Here's what I have so far:


import java.io.*;
public class binMain {

/**
* @param args
*/
public static void main(String[] args) throws IOException{
// TODO Auto-generated method stub

BufferedReader keyboard = new BufferedReader (new InputStreamReader (System.in));



double input = 0;

char choice = ' ';





while(choice!='Q' && choice!= 'q')
{ //start of while
System.out.println("He110!! Ready make a conversion?!?");
System.out.println("Make a selection!!!!!!!");
System.out.println("a - Input the number you want to convert.");
System.out.println("b - Convert from Binary to Decimal");
System.out.println("c - Convert from Decimal to Binary");
System.out.println("q - quit!!!!!!!no wai--");


choice = keyboard.readLine().charAt(0);

switch(choice)
{//start of switch
case'A':
case'a':
{

}
break;

case'B':
case'b':
{

}
break;

case'C':
case'c':
{

}
break;

case'Q':
case'q':
{System.out.println("Thanks converting!! ");}
break;

}//end of switch
}//end of while
}



---------------------------------------------------------------
i know i have to use an array and i'm lost on the math. Any help would be greatly appreciated. Thanks

[ggomez]

mmm

forums are for doubts not to get homeworks

Code: Select all

public class Convertion {

    public Convertion() {
    }
   
    public int toDec(String x)
    {
       int b=1;
       int s=0;
       int e=0;
       for(int a=x.length()-1;a>=0;a--)
       {
          e=Integer.valueOf(String.valueOf(x.charAt(a)));
          s=s+(e*b);
          b=b*2;
       }
       return s;
    }
   
    public String toBin(int x)
    {
       return Integer.toBinaryString(x);
    }
   
    public static void main(String arg[])
    {
       Convertion c=new Convertion();
       System.out.println(c.toDec("100"));
       
    }
   
}