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- import java.util.*;
- public class RoundRobin
- {
- static Scanner console = new Scanner (System.in);
- public static void main (String[]args)throws Exception
- {
- System.out.println("ROUND ROBIN SCHEDULING");
- System.out.println("\n\nNOTE: Quantum Time to be entered \n\tmust be higher than the lowest Job's CPU Burst Value \n\tand must be lower than the highest Job's CPU Burst Value");
- int number;
- System.out.print("\n\nEnter no. of Jobs from 1 - 10: ");
- number = console.nextInt();
- if (number < 1 || number > 10)
- {
- System.out.println("Enter no. of jobs from 1 to 10 only!");
- System.out.print("\nEnter number of jobs (1 to 10 only):");
- number=console.nextInt();
- }
- if (number >= 1 || number <= 10)
- {
- int ctr;
- int pass;
- int keep;
- int[] cpub = new int[number];
- int[] mirrorc = new int[number];
- int[] tat = new int[number];
- for (ctr=0; ctr<number; ctr++)
- {
- System.out.print("\nEnter CPU Burst of Job "+ (ctr+1) +": ");
- cpub[ctr] = console.nextInt();
- mirrorc[ctr] = cpub[ctr];
- }
- if (cpub[ctr]<1)
- {
- System.out.print("\nEnter CPU Bursts not equal to or lesser than 0!");
- System.out.print("Enter CPU Burst of Job "+ (ctr+1) +": ");
- cpub[ctr] = console.nextInt();
- }
- for (pass = 0; pass < number-1; pass++)
- {
- for (ctr = 0; ctr < number-1; ctr++)
- {
- if (cpub[ctr] > cpub[ctr + 1])
- {
- keep = cpub[ctr] = cpub[ctr+1];
- }
- }
- }
- for (pass = 0; pass < number-1; pass++)
- {
- for (ctr = 0; ctr < number-1; ctr++)
- {
- if (mirrorc[ctr] > mirrorc[ctr + 1])
- {
- keep = mirrorc[ctr] = mirrorc[ctr+1];
- }
- }
- }
- System.out.print("\nEnter Quantum Time: ");
- int qt = console.nextInt();
- if (qt < mirrorc[ctr] || qt > mirrorc[ctr-1])
- {
- System.out.println("Invalid QT! Enter QT higher than the \nlowest job and lower than the highest job.");
- System.out.print("\nEnter Quantum Time: ");
- qt = console.nextInt();
- }
- System.out.println("Arrangement of Jobs:");
- int x;
- x = ((mirrorc[number-1]) / qt) + 1;
- int y;
- for (y = x; y >= 1; y --)
- {
- for (ctr = 0; ctr < number; ctr++);
- {
- if(cpub[ctr] > qt)
- {
- cpub[ctr] = cpub[ctr] - qt;
- System.out.println("\t" + (ctr + 1) + " " + qt);
- }
- else if (cpub[ctr] >= 1 && cpub[ctr] < qt)
- {
- System.out.println("\t"+(ctr + 1)+" " +cpub[ctr]);
- cpub[ctr] = 0;
- }
- else if (cpub[ctr] == qt)
- {
- System.out.println("\t"+(ctr + 1)+" " + cpub[ctr]);
- cpub[ctr] = 0;
- }
- else if (cpub[ctr] == 0)
- {
- System.out.println("...");
- }
- }
- }
- }
- }
- }
I'm getting this output, which displays the error just after entering CPU Bursts of jobs... the quantum time doesn't even show up:
Expand|Select|Wrap|Line Numbers
- ROUND ROBIN SCHEDULING
- NOTE: Quantum Time to be entered
- must be higher than the lowest Job's CPU Burst Value
- and must be lower than the highest Job's CPU Burst Value
- Enter no. of Jobs from 1 to 10 only: 3
- Enter CPU Burst of Job 1: 4
- Enter CPU Burst of Job 2: 6
- Enter CPU Burst of Job 3: 2
- Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 3
- at RoundRobin.main(RoundRobin.java:38)
- Process completed.
