Find Turnaround Time And Waiting Time

Implementation of CPU scheduling algorithms to find turnaround time and waiting time.

Burst Time : Every process in a computer system requires some amount of time for its execution. Burst time is the total time taken by the process for its execution on the CPU.
Waiting Time : Waiting time is the total time spent by the process in the ready state waiting for CPU.

Waiting Time = Turn Around Time – Burst Time

Arrival Time : Arrival time is the time when a process enters into the ready state and is ready for its execution.
Turnaround Time : Turnaround time is the total amount of time spent by the process from coming in the ready state for the first time to its completion.

Turnaround time = Burst time + Waiting time  or  Turnaround time = Exit time – Arrival time

Program

#include<iostream.h>
#include<conio.h>
#define MAXLIMIT 20
void main(){
   clrscr();
   int n,burst_time[20],waiting_time[20],turnaround_time[20],avg_waiting_time=0,avg_turnaround_time=0,i,j;
   cout<<"Enter Total Number of Processes (Max 20): ";
   cin>>n;
   //Number of Process
   if(n>=MAXLIMIT){
	cout<<"----Sorry :( MaxLimit is 20 You Enter "<<n<<" ----";
   //End If
   }else{
    cout<<"\nEnter Process Burst Time\n";
    for(i=0;i<n;i++)
    {
	cout<<"P["<<i+1<<"]: ";
	cin>>burst_time[i];
    }
    waiting_time[0]=0;
    //Waiting Time for First Process is 0
    //Calculating Waiting Time
    for(i=1;i<n;i++){
	waiting_time[i]=0;
	for(j=0;j<i;j++)
	waiting_time[i]+=burst_time[j];
    } 
    cout<<"\nProcess\t\tBurst Time\tWaiting Time\tTurnaround Time";
    //Calculating Turnaround time
    for(i=0;i<n;i++){
	turnaround_time[i] = burst_time[i]+waiting_time[i];
	avg_waiting_time += waiting_time[i];
	avg_turnaround_time += turnaround_time[i];
	cout<<"\nP["<<i+1<<"]"<<"\t\t"<<burst_time[i]<<"\t\t"<<waiting_time[i]<<"\t\t"<<turnaround_time[i];
    }
    avg_waiting_time/=i;
    avg_turnaround_time/=i;
    cout<<"\n\nAverage Waiting Time:"<<avg_waiting_time;
    cout<<"\nAverage Turnaround Time:"<<avg_turnaround_time;
   }//End Else
    getch();
    //Hold Program Execution For Display
}

Program Output