OS First Come First Serve Exp-1

FCFS.cpp

#include<iostream.h>
#include<conio.h>

int main() {

	int n,burst[20],wait[20],tat[20],avgwt=0,avgtat=0,i,j;

	clrscr();

	cout<<"Enter total number of processes(maximum 20):";
	cin>>n;

	cout<<"\nEnter Process Burst Time\n";
	for(i=0;i<n;i++)
	{   //Get Process burst time from user
		cout<<"P["<<i+1<<"]:";
		cin>>burst[i];
	}

	wait[0]=0;    //waiting time for first process should be set to 0.

	//calculating waiting time for every process.
	for(i=1;i<n;i++){

		wait[i]=0;// Set wait = 0 before adding burst time.
		for(j=0;j<i;j++)
			wait[i]+=burst[j];
	}

	cout<<"\nProcess\tBurst Time\tWaiting Time\tTurnaround Time";

	//calculating turnaround time
	for(i=0;i<n;i++){
		tat[i]=burst[i]+wait[i];
		avgwt+=wait[i];
		avgtat+=tat[i];
		cout<<"\nP["<<i+1<<"]"<<"\t\t"<<burst[i]<<"\t\t"<<wait[i]<<"\t\t"<<tat[i];
	}

	avgwt/=n;
	avgtat/=n;

	cout<<"\n\nAverage Waiting Time:"<<avgwt;
	cout<<"\nAverage Turnaround Time:"<<avgtat;

	getch();
	return 0;
}