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Write a C program to perform Priority Scheduling
Q:

Write a C program to perform Priority Scheduling

robaa
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2022-11-25
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Write a C program to perform Priority Scheduling.  Here’s a Simple program for priority scheduling algorithm in C Programming Language.

The Priority Scheduling Program in C Language is normally implemented in Operating Systems to schedule multiple process entering the CPU for execution. This code is for Priority Scheduling Non – Preemptive Algorithm in C Programming.

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robaa
2022-11-25
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What is Priority Scheduling Algorithm?

In a Priority based Scheduling Algorithm in Operating Systems, every process is assigned a Priority Number. Based on this Priority Number, the processes are executed. This scheduling algorithm is normally very useful in real-time systems. The process having the highest priority (1) is executed first and then priority 2, 3 and so on.

Below is the source code for C Program to input values into an array and display them which is successfully compiled and run on Windows System to produce desired output as shown below :

SOURCE CODE : :

#include<stdio.h>
#include<conio.h>
void main()
 {
   int x,n,p[10],pp[10],pt[10],w[10],t[10],awt,atat,i;
   printf("Enter the number of process : ");
   scanf("%d",&n);
   printf("\n Enter process : time priorities \n");
   for(i=0;i<n;i++)
    {
      printf("\nProcess no %d : ",i+1);
      scanf("%d  %d",&pt[i],&pp[i]);
      p[i]=i+1;
    }
  for(i=0;i<n-1;i++)
   {
     for(int j=i+1;j<n;j++)
     {
       if(pp[i]<pp[j])
       {
         x=pp[i];
         pp[i]=pp[j];
         pp[j]=x;
         x=pt[i];
         pt[i]=pt[j];
         pt[j]=x;
         x=p[i];
         p[i]=p[j];
         p[j]=x;
      }
   }
}
w[0]=0;
awt=0;
t[0]=pt[0];
atat=t[0];
for(i=1;i<n;i++)
 {
   w[i]=t[i-1];
   awt+=w[i];
   t[i]=w[i]+pt[i];
   atat+=t[i];
 }
printf("\n\n Job \t Burst Time \t Wait Time \t Turn Around Time   Priority \n");
for(i=0;i<n;i++)
  printf("\n %d \t\t %d  \t\t %d \t\t %d \t\t %d \n",p[i],pt[i],w[i],t[i],pp[i]);
awt/=n;
atat/=n;
printf("\n Average Wait Time : %d \n",awt);
printf("\n Average Turn Around Time : %d \n",atat);
getch();
}

OUTPUT : :

Enter the number of process : 4

 Enter process : time priorities

Process no 1 : 3
1

Process no 2 : 4
2

Process no 3 : 5
3

Process no 4 : 6
4


 Job     Burst Time      Wait Time       Turn Around Time   Priority

 4               6               0               6               4

 3               5               6               11              3

 2               4               11              15              2

 1               3               15              18              1

 Average Wait Time : 8

 Average Turn Around Time : 12

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