Question

Write a Java program that prompts the user for the page size used in a virtual memory system; this will be a power of two between 512 (2⁹) and 16384 (2¹⁴), inclusive. Your program should check the user input for page size to make sure it is one of the allowable inputs (must be a power of 2 and cannot be smaller than 512 or larger than 16384), and should then prompt the user for a virtual address (assume 32-bit virtual addressing, so your code must be able to accept any input between 0 and 4294967295, which is 2³²-1). Given this input, the program must output the virtual page number and the offset within the page. Sample output might look like this:

Please enter the system page size:

1024

Please enter the virtual address:

10000

This address is in virtual page:

9

At offset:

784

Answer 1

import java.util.Scanner;

public class Paging {
public static void main(String args[]){
Scanner sc = new Scanner(System.in);
System.out.print("Enter the system page size: ");
//reading the size
int size = sc.nextInt();
long adddress = 0;
long pageNumber = 0;

//checking if given size is valid
if(size >= 512 && size <=16384){
System.out.print("Enter the virtual address: ");
adddress = sc.nextLong();
//reading address and checking that is in given range
if(adddress >= 0 && adddress <= 4294967295L){
   //finding page number
pageNumber = adddress/size;
System.out.println("This address is in virtual page: "+pageNumber);
//finding offset
System.out.println("At offset: " + (adddress-(pageNumber*size)));
}
else{
System.out.println("Invalid input");
}
}
else{
System.out.println("Invalid input");
}
}
}

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Answer 2

Sure! Here's a Java program that prompts the user for the page size and virtual address, and then calculates the virtual page number and offset:

javaCopy codeimport java.util.Scanner;public class VirtualMemorySystem {    public static void main(String[] args) {        Scanner scanner = new Scanner(System.in);        // Prompt for page size
        System.out.print("Please enter the system page size: ");        int pageSize = scanner.nextInt();        // Check if page size is valid
        if (!isValidPageSize(pageSize)) {
            System.out.println("Invalid page size. Page size must be a power of 2 between 512 and 16384.");            return;
        }        // Prompt for virtual address
        System.out.print("Please enter the virtual address: ");        long virtualAddress = scanner.nextLong();        // Calculate virtual page number and offset
        int virtualPageNumber = calculateVirtualPageNumber(virtualAddress, pageSize);        int offset = calculateOffset(virtualAddress, pageSize);        // Output the results
        System.out.println("This address is in virtual page: " + virtualPageNumber);
        System.out.println("At offset: " + offset);
    }    // Check if the page size is valid
    private static boolean isValidPageSize(int pageSize) {        return (pageSize >= 512 && pageSize <= 16384) && ((pageSize & (pageSize - 1)) == 0);
    }    // Calculate the virtual page number
    private static int calculateVirtualPageNumber(long virtualAddress, int pageSize) {        return (int) (virtualAddress / pageSize);
    }    // Calculate the offset
    private static int calculateOffset(long virtualAddress, int pageSize) {        return (int) (virtualAddress % pageSize);
    }
}

In this program, we first prompt the user to enter the page size, then we check if the input is a valid page size using the isValidPageSize() method. If the page size is valid, we prompt the user to enter the virtual address. We then calculate the virtual page number and offset using the calculateVirtualPageNumber() and calculateOffset() methods, respectively. Finally, we output the results to the console.