FCFS

#include<stdio.h>
struct process
{
        char pname[30];
        int btime,wtime,tatime;
}arr[50];
int main()
{
        int n,i,ttatime=0,twtime=0,index;
        printf("Enter the number of processes:");
        scanf("%d",&n);
        for(i=1;i<=n;i++)
        {
                index=i-1;
                printf("Enter process #%d name:",i);
                scanf("%s",&arr[index].pname);
                printf("Enter burst time:");
                scanf("%d",&arr[index].btime);
                if(i==1)
                {
                        arr[index].wtime=0;
                        arr[index].tatime=arr[index].btime;
                }
                else
                {
                        arr[index].wtime=arr[index-1].tatime;
                        arr[index].tatime=arr[index].wtime+arr[index].btime;
                }
                ttatime+=arr[index].tatime;
                twtime+=arr[index].wtime;
        }
        for(i=1;i<=n;i++)
        {
                index=i-1;
                printf("PROCESS NAME:%s\nBURST TIME:%d\nWAITING TIME:%d\nTURNAROUND TIME:%d\n\n",arr[index].pname,arr[index].btime,arr[index].wtime,arr[index].tatime);
        }
        printf("Average waiting time:%f\nAverage turnaround time:%f\n",(float)twtime/n,(float)ttatime/n);
        return 0;
}
/*
Output:
[cse2a42@localhost ~]$ cc fcfs.c
[cse2a42@localhost ~]$ ./a.out
Enter the number of processes:3
Enter process #1 name:A
Enter burst time:5
Enter process #2 name:B
Enter burst time:10
Enter process #3 name:C
Enter burst time:15
PROCESS NAME:A
BURST TIME:5
WAITING TIME:0
TURNAROUND TIME:5

PROCESS NAME:B
BURST TIME:10
WAITING TIME:5
TURNAROUND TIME:15

PROCESS NAME:C
BURST TIME:15
WAITING TIME:15
TURNAROUND TIME:30

Average waiting time:6.666667
Average turnaround time:16.666667


*/