Question

Modify the virtual translator program: virtual.java

Modify it so it loops ten times asking the user for the ten virtual address from the work sheet we did the week before spring break.

Once you have it working run it in a script command capturing the output. Make sure the script file has a .txt extension and upload the output.

//Java Program

import java.util.Scanner;

public class virtual{

   public static void main(String[] args){

   int[] virtualAddressPace={2,1,6,0,4,3,-1,-1,-1,5,-1,7,-1,-1,-1,-1};

   Scanner input = new Scanner(System.in);
   System.out.print("Enter a virtual address: ");
   int vAdd = input.nextInt();

   System.out.println("Address as Hex " + Integer.toHexString(vAdd));
   System.out.println("Address as Binary " + Integer.toBinaryString(vAdd));

   int maskUpper = 0xFFFFF000;
   int maskLower = 0xFFFF0FFF;

   int highBits = vAdd & maskUpper;
   int lowBits = vAdd & maskLower;

   System.out.println("High Bits " + Integer.toHexString(highBits));
   System.out.println("Low Bits " + Integer.toHexString(lowBits));

   highBits = highBits >> 12;

   System.out.println("High Bits shifted: " + Integer.toHexString(highBits));

  
   int pIndex = virtualAddressPace[highBits];

   if (pIndex >= 0){

       pIndex = pIndex << 12;
       int physicalMemory = pIndex + lowBits;
       System.out.println("The physcial address is: " + physicalMemory);
   }
   else{
       System.out.println("Page Fault");
   }

   }
}

Answer 1

just add a do while loop

import java.util.Scanner;

public class virtual{

   public static void main(String[] args){

   int[] virtualAddressPace={2,1,6,0,4,3,-1,-1,-1,5,-1,7,-1,-1,-1,-1};

int count = 0;

   do{

   Scanner input = new Scanner(System.in);
   System.out.print("Enter a virtual address: ");
   int vAdd = input.nextInt();

   System.out.println("Address as Hex " + Integer.toHexString(vAdd));
   System.out.println("Address as Binary " + Integer.toBinaryString(vAdd));

   int maskUpper = 0xFFFFF000;
   int maskLower = 0xFFFF0FFF;

   int highBits = vAdd & maskUpper;
   int lowBits = vAdd & maskLower;

   System.out.println("High Bits " + Integer.toHexString(highBits));
   System.out.println("Low Bits " + Integer.toHexString(lowBits));

   highBits = highBits >> 12;

   System.out.println("High Bits shifted: " + Integer.toHexString(highBits));

  
   int pIndex = virtualAddressPace[highBits];

   if (pIndex >= 0){

       pIndex = pIndex << 12;
       int physicalMemory = pIndex + lowBits;
       System.out.println("The physcial address is: " + physicalMemory);
   }
   else{
       System.out.println("Page Fault");
   }

   }

}while(count<10);
}

For running a txt file containing java code use bean shell.