OS-FCFS

#include<stdio.h>
#include<conio.h>
void main()
{
    int n,bt[20],wt[20],tat[20],avwt=0,avtat=0,i,j;
    clrscr();
    printf("\n----FCFS-----\n");
    printf("\nEnter total number of processes:");
    scanf("%d",&n);

    printf("\nEnter Process Burst Time\n");
    for(i=0;i<n;i++)
    {
    printf("P[%d]:",i+1);
    scanf("%d",&bt[i]);
    }

    wt[0]=0;    //wt for first process is 0

    //calculating waiting time
    for(i=1;i<n;i++)
    {
    wt[i]=0;
    for(j=0;j<i;j++)
        wt[i]+=bt[j];
    }

    printf("\nProcess\t\tBurst Time\tWaiting Time\tTurnaround Time");

    //calculating turnaround time
    for(i=0;i<n;i++)
    {
    tat[i]=bt[i]+wt[i];
    avwt+=wt[i];
    avtat+=tat[i];
    printf("\nP[%d]\t\t%d\t\t%d\t\t%d",i+1,bt[i],wt[i],tat[i]);
    }

    avwt/=i;
    avtat/=i;

    printf("\n\nAverage Waiting Time:%d",avwt);
    printf("\nAverage Turnaround Time:%d",avtat);

    getch();
}