C Program for Priority CPU Scheduling Algorithm

OUTPUT:
enter no of processes: 5

enter process1 name: aaa
enter process time: 4
enter priority:5
enter process2 name: bbb
enter process time: 3
enter priority:4
enter process3 name: ccc
enter process time: 2
enter priority:3
enter process4 name: ddd
enter process time: 5
enter priority:2
enter process5 name: eee
enter process time: 1
enter priority:1

p_name P_time priority w_time
eee 1 1 0
ddd 5 2 1
ccc 2 3 6
bbb 3 4 8
aaa 4 5 11

total waiting time=26
avg waiting time=5.20

#include

#include

void main()

{

  char p[10][5],temp[5];

  int i,j,pt[10],wt[10],totwt=0,pr[10],temp1,n;

    float avgwt;

  clrscr();

printf("enter no of processes:");

scanf("%d",&n);

  for(i=0;i
  {

  printf("enter process%d name:",i+1);

  scanf("%s",&p[i]);

  printf("enter process time:");

  scanf("%d",&pt[i]);

  printf("enter priority:");

  scanf("%d",&pr[i]);

  }

  for(i=0;i
  {

 for(j=i+1;j
  {

   if(pr[i]>pr[j])

   {

   temp1=pr[i];

  pr[i]=pr[j];

  pr[j]=temp1;

  temp1=pt[i];

  pt[i]=pt[j];

  pt[j]=temp1;

  strcpy(temp,p[i]);

  strcpy(p[i],p[j]);

  strcpy(p[j],temp);

  }

  }

  }

  wt[0]=0;

  for(i=1;i
  {

   wt[i]=wt[i-1]+et[i-1];

   totwt=totwt+wt[i];

   }

   avgwt=(float)totwt/n;

   printf("p_name\t p_time\t priority\t w_time\n");

    for(i=0;i
    {

   printf(" %s\t %d\t %d\t %d\n" ,p[i],pt[i],pr[i],wt[i]);

   }

   printf("total waiting time=%d\n avg waiting time=%f",tot,avg);

getch();

   }

OUTPUT:

enter no of processes: 5
enter process1 name: aaa

enter process time: 4

enter priority:5

enter process2 name: bbb

enter process time: 3

enter priority:4

enter process3 name: ccc

enter process time: 2

enter priority:3

enter process4 name: ddd

enter process time: 5

enter priority:2

enter process5 name: eee

enter process time: 1

enter priority:1
p_name  P_time  priority  w_time

eee	1	1	   0

ddd	5	2	   1

ccc	2	3	   6

bbb	3	4	   8

aaa	4	5	   11
total waiting time=26

avg waiting time=5.20
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Tags: clrscr, name, priority 1, process, time, time priority