Priority

 #include <stdio.h>

struct process

{

int pid; int btime;int pri; int

wtime;int ttime;

} p[10], temp;

main()

{

int i,j,k,n,ttur,twat;float awat,atur;

printf("Enter no. of process : ");scanf("%d", &n);

for(i=0; i<n; i++)

{

printf("Burst time for process P%d (in ms) : ", (i+1));scanf("%d", &p[i].btime);

printf("Priority for process P%d : ", (i+1));scanf("%d", &p[i].pri);

p[i].pid = i+1;

}

for(i=0; i<n-1; i++)

{

for(j=i+1; j<n; j++)

{

if((p[i].pri > p[j].pri) ||

(p[i].pri == p[j].pri && p[i].pid > p[j].pid) )

{

temp = p[i]; p[i] = p[j]; p[j] =temp;

}

}

}

p[0].wtime = 0; for(i=0; i<n; i++)

{

p[i+1].wtime = p[i].wtime + p[i].btime;p[i].ttime = p[i].wtime +

p[i].btime;

}

ttur = twat = 0; for(i=0; i<n; i++)

{

ttur += p[i].ttime;twat += p[i].wtime;

}

awat = (float)twat / n;atur = (float)ttur / n;

printf("\n\t Priority Scheduling\n\n");for(i=0; i<38; i++)

printf("-");

printf("\nProcess B-Time Priority T-TimeW-Time\n");for(i=0; i<38; i++)

printf("-"); for (i=0; i<n; i++)

 printf("\nP%-4d\t%4d\t%3d\t%4d\t%4d", p[i].pid,p[i].btime,p[i].pri,p[i].ttime,p[i].wtime);

 printf("\n"); for(i=0; i<38; i++)

 printf("-");

printf("\n\nAverage waiting time: %5.2fms", awat);printf("\nAverage turn around time :

%5.2fms\n", atur);

printf("\n\nGANTT Chart\n");printf("-");

for(i=0; i<(p[n-1].ttime + 2*n); i++)printf("-");

printf("\n|"); for(i=0; i<n; i++)

{

k = p[i].btime/2; for(j=0; j<k; j++)

printf(" "); printf("P%d",p[i].pid); for(j=k+1;

j<p[i].btime; j++)

printf(" ");

printf("|");

}

printf("\n-");

for(i=0; i<(p[n-1].ttime + 2*n); i++)printf("-");

printf("\n0"); for(i=0; i<n; i++)

{

for(j=0; j<p[i].btime; j++)printf(" ");

printf("%2d",p[i].ttime);

}

}

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