Shortest Job First(SJF)

Description

This code is used to implement the Shortest Job First Scheduling Algorithm.

More Info

Submitted On
By	Adri Jovin
Level	Advanced
User Rating	4.3 (13 globes from 3 users)
Compatibility	C
Category	Algorithms
World	C / C++
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Source Code

//Source Code produced by Adri Jovin.J.J
#include<stdio.h>
main()
{
float avgwt,avgtt;
char pname[10][10],c[10][10];
int wt[10],tt[10],bt[10],at[10],t,q,i,n,sum=0,sbt=0,ttime,j,ss=0;
printf("\n\n Enter the number of processes:");
scanf("%d",&n);
printf("\n\n Enter the NAME,BURSTTIME and ARRIVALTIME of the processes");
for(i=0;i<n;i++)
{
printf("\n\n NAME :");
scanf("%s",&pname[i]);
printf("\n\nBURST TIME :");
scanf("%d",&bt[i]);
printf("\n\n ARRIVAL TIME :");
scanf("%d",&at[i]);
}
for(i=0;i<n;i++)
for(j=i+1;j<n;j++)
{
if(at[i]==at[j])
if(bt[i]>bt[j])
{
t=at[i];
at[i]=at[j];
at[j]=t;
q=bt[i];
bt[i]=bt[j];
bt[j]=q;
strcpy(c[i],pname[i]);
strcpy(pname[i],pname[j]);
strcpy(pname[j],c[i]);
}
if(at[i]!=at[j])
if(bt[i]>bt[j])
{
t=at[i];
at[i]=at[j];
at[j]=t;
q=bt[i];
bt[i]=bt[j];
bt[j]=q;
strcpy(c[i],pname[i]);
strcpy(pname[i],pname[j]);
strcpy(pname[j],c[i]);
}
}
wt[0]=0;
for(i=0;i<n;i++)
{
wt[i+1]=wt[i]+bt[i];
sum=sum+(wt[i]-at[i]);
sbt=sbt+(wt[i+1]-at[i]);
tt[i]=wt[i]+bt[i];
ss=ss+bt[i];
}
printf("\n\n GANTT CHART");
printf("\n\n ------------------------------------------------------------------\n");
for(i=0;i<n;i++)
{
printf("|\t%s\t",pname[i]);
sbt=sbt+wt[i+1];
tt[i]=wt[i]+bt[i];
ss=ss+bt[i];
}
printf("\n\nGANTT CHART");
printf("\n--------------------------------------------------------------------\n");
for(i=0;i<n;i++)
{
printf("|\t%s\t",pname[i]);
}
printf("\n--------------------------------------------------------------------\n");
for(i=0;i<n;i++)
{
printf("%d\t\t",wt[i]);
}
printf("%d\n",ss);
printf("\n--------------------------------------------------------------------\n");
printf("\n\n Total WAITING TIME of the process=%d",sum);
printf("\n\nTotal TURNAROUND TIME of the process=%d",sbt);
avgwt=(float)sum/n;
avgtt=(float)sbt/n;
printf("\n\nAverage WAITING TIME of the process=%f",avgwt);
printf("\n\nAverage TURNAROUND TIME of the process=%f",avgtt);
}