Priority based cpu scheduling in c program - Priority based cpu scheduling in operating system

Aim:To  implement Priority based cpu scheduling algorithm.

Program:

 #include<stdio.h>

#include<conio.h>

void main()

{

                int bt[10],wt[10],tt[10],pt[10],i,j,n,stt,swt=0,temp1,temp2;

                float awt,att;

                clrscr();

                printf("enter no of processes \n");

                scanf("%d",&n);

                printf("enter %d process times \n",n);

                for(i=0;i<n;i++)

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

                printf("enter %d process priorites \n",n);

                for(i=0;i<n;i++)

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

                printf("\n CPU time and priorities before sorting");

                for(i=0;i<n;i++)

                                printf("%d \t %d \n",bt[i],pt[i]);

                for(i=0;i<n;i++)

                {

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

                                {

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

                                                {

                                                                temp1=bt[i];

                                                                bt[i]=bt[j];

                                                                bt[j]=temp1;

                                                                temp2=pt[i];

                                                                pt[i]=pt[j];

                                                                pt[j]=temp2;

                                                }

                                }

                }

                printf("\n CPU times and priorities after sorting \n");

                for(i=0;i<n;i++)

                                printf("%d \t %d \n",bt[i],pt[i]);

                tt[0]=bt[0];

                wt[0]=0;

                stt=0;

                for(i=1;i<n;i++)

                {

                                wt[i]=tt[i-1];

                                tt[i]=wt[i]+bt[i];

                                stt+=tt[i];

                                swt+=wt[i];

                }

                awt=(float)swt/n;

                att=(float)stt/n;

                printf("\n CPU time \t priority \t wtime \t ttime \n");

                for(i=0;i<n;i++)

                                printf("%d \t %d \t %d \t %d \n",bt[i],pt[i],wt[i],tt[i]);

                printf("\n average waiting time is %f",awt);

                printf("\n average turn around time is %f",att);

                getch();

}

Output: