Comments on: C program for SJF CPU Scheduling Algorithm

By: Jyoti

Jyoti — Wed, 28 Mar 2012 04:24:22 +0000

Thank u very much for ur programs. It helped me a lot in my OS subject….
Thank u………..

By: kj

kj — Thu, 15 Mar 2012 09:44:38 +0000

import java.io.*;
import java.awt.*;
import java.applet.*;

public class Scorebar extends Applet
{
int sri[]={3,3,1,4,6,2,9,1,0,3,8,7,8,3,5,1,10,2,3,0,5,8,2,5,6,11,3,7,7,4,5,6,4,5,11,4,3,6,3,2,2,1,2,4,3,9,4,9,12,4};
int ind[]={2,4,7,6,4,1,2,8,8,2,3,2,7,5,7,5,6,0,3,1,10,1,3,5,1,6,5,8,4,9,2,3,3,4,8,2,5,7,4,5,0,2,2,4,5,13,5,4,15,4};

public void init()
{

}
public void paint(Graphics g)
{
try
{
int j=-5;
for(int i=0;i<50;i++)
{
g.setColor(Color.red);
g.fillRect(j+5,200,5,sri[i]*10);
g.setColor(Color.blue);
j=j+5;
g.fillRect(j+5,200,5,ind[i]*10);
j=j+5;
}
}catch(Exception e){}
}
}

By: msgd

msgd — Thu, 15 Mar 2012 09:25:43 +0000

import java.awt.*;
import java.applet.*;
public class UserIn extends Applet
{
TextField text1, text2;
public void init()
{
Label lob1=new Label();
Label lob2=new Label();
Label lob3=new Label();
Label lob4=new Label();
Label lob5=new Label();
Label lob6=new Label();
Label lob7=new Label();
Label lob8=new Label();
Label lob9=new Label();
lob1.setText(“BE”);
lob2.setText(“ES”);
lob3.setText(“DMS”);
lob4.setText(“DS”);
lob5.setText(“PSQT”);
lob6.setText(“FDL”);
lob7.setText(“DS LAB”);
lob8.setText(“BE LAB”);
lob9.setText(“ECS LAB”);
text1=new TextField(8);
text2=new TextField(8);
add(lob1);
add (text1);
add(lob2);
add (text2);
text1.setText (“0″);
text2.setText (“0″);
}
public void paint(Graphics g)
{
int x=0, y=0, z=0;
String s1=null, s2=null, s=null;
g.drawString(“Input a number in each box”,10,45);
try
{
s1=text1.getText();
x= Integer.parseInt(s1);
s2=text2.getText();
y= Integer.parseInt(s2);
}
catch (Exception ex) { System.out.println(ex);}
z= x + y;
s=String.valueOf(z);
g.drawString (“The Sum is: “+s,10,75);
}
public boolean action (Event event, Object object)
{
repaint ();
return true;
}
}

By: Ravi Kumar

Ravi Kumar — Wed, 14 Mar 2012 01:16:05 +0000

b) SJF:
AIM: A program to simulate the SJF CPU scheduling algorithm
PROGRAM:
#include
#include
#include
void main()
{
int et[20],at[10],n,i,j,temp,st[10],ft[10],wt[10],ta[10];
int totwt=0,totta=0;
float awt,ata;
char pn[10][10],t[10];
clrscr();
printf(“Enter the number of process:”);
scanf(“%d”,&n);
for(i=0;i {
printf("Enter process name, arrival time & execution time:");
flushall();
scanf("%s%d%d",pn[i],&at[i],&et[i]);
}
for(i=0;i for(j=0;j {
if(et[i] {
temp=at[i];
at[i]=at[j];
at[j]=temp;
temp=et[i];
et[i]=et[j];
et[j]=temp;
strcpy(t,pn[i]);
strcpy(pn[i],pn[j]);
strcpy(pn[j],t);
}
}
for(i=0;i {
if(i==0)
st[i]=at[i];
else
6
st[i]=ft[i-1];
OS Lab Manual K. Ravi Chythanya
wt[i]=st[i]-at[i];
ft[i]=st[i]+et[i];
ta[i]=ft[i]-at[i];
totwt+=wt[i];
totta+=ta[i];
}
awt=(float)totwt/n;
ata=(float)totta/n;
printf("\nPname\tarrivaltime\texecutiontime\twaitingtime\ttatime");
for(i=0;i printf("\n%s\t%5d\t\t%5d\t\t%5d\t\t%5d",pn[i],at[i],et[i],wt[i],ta[i]);
printf("\nAverage waiting time is:%f",awt);
printf("\nAverage turnaroundtime is:%f",ata);
getch();
}
OUTPUT:
Input:
Enter the number of processes: 3
Enter the Process Name, Arrival Time & Burst Time: 1 4 6
Enter the Process Name, Arrival Time & Burst Time: 2 5 15
Enter the Process Name, Arrival Time & Burst Time: 3 6 11
Output:
Pname arrivaltime executiontime waitingtime tatime
1 4 6 0 6
3 6 11 4 15
2 5 15 16 31
Average Waiting Time: 6.6667
Average Turn Around Time: 17.3333

By: Tamie Caffarelli

Tamie Caffarelli — Mon, 12 Mar 2012 14:04:19 +0000

Business, that’s easily defined – it’s other people’s money.
Individuals will buy anything that is ‘one to a customer.’

By: amey

amey — Wed, 22 Feb 2012 14:57:27 +0000

please upload pre-emptive algorithms pgm-fcfs,srtf,rr,priority

By: sri

sri — Mon, 06 Feb 2012 14:43:28 +0000

plz do try 2 post codes for preemptive scheduling also

By: murali krishna

murali krishna — Sat, 31 Dec 2011 04:49:00 +0000

i want all cpu scheduling algorithms with programmes
tell me any site
but remeber one thing i want small programmes

By: Ivan

Ivan — Mon, 12 Dec 2011 12:40:40 +0000

Fucking syntax errors . don’t know how to fix it .

By: preetam

preetam — Sun, 04 Dec 2011 11:53:23 +0000

Can any1 help me wid c code for multilevel round roubin scheduling pls???