ps.c

#include<stdio.h>
int p[30],bt[30],tot_tat=0,pr[30],wt[30],n,tot_wt=0,tat[30],PR_wt=0,PR_tat=0;
float awt,avg_tat,avg_wt;
void main()
{
int i;
printf("\nEnter the no.of processes \n");
scanf("%d",&n);
for(i=0;i<n;i++)
{
printf("Enter burst time and priority of process[%d]:",i+1);
scanf("%d%d",&bt[i],&pr[i]);
p[i] = i;
}
sort();
WT_TAT(&PR_tat,&PR_wt);
printf("\n\nTotal Turn around Time:%d",PR_tat);
printf("\nAverage Turn around Time :%d ", PR_tat/n);
printf("\nTotal Waiting Time:%d",PR_wt);
printf("\nTotal avg. Waiting Time:%d",PR_wt/n);
}
int sort()
{
int t,i,j,t2,t1;
for(i=0;i<n;i++)
{
for(j=i+1;j<n;j++)
{
if(pr[i]>pr[j])
{
swap(&bt[j],&bt[i]);
swap(&p[j],&p[i]);
swap(&pr[j],&pr[i]);
}
}
}
return 0;
}
int swap(int *a, int *b)
{
int t;
t = *a;
*a = *b;
*b = t;
return 0;
}
int WT_TAT(int *a, int *b)
{
int i;
for(i=0;i<n;i++)
{
if(i==0)
tat[i] = bt[i];
else
tat[i] = tat[i-1] + bt[i];
tot_tat=tot_tat+tat[i];
}
*a = tot_tat;
wt[0]=0;
for(i=1;i<n;i++)
{
wt[i]=wt[i-1]+bt[i-1];
tot_wt = tot_wt+wt[i];
}
*b = tot_wt;
printf("\nPROCESS\t\tBURST TIME\tPRIORITY\tTURN AROUND TIME\tWAITING TIME");
for(i=0; i<n; i++)
printf("\nprocess[%d]\t\t%d\t\t%d\t\t%d\t\t%d",p[i]+1,bt[i],pr[i],tat[i],wt[i]);
return 0; 
}