fcfs.cpp

#include<iostream>
using namespace std;
int main(){
 int at[10],bt[10],wt[10],tat[10],n,burst,complete,temp1,temp2,p[10],temp3,comp;
 float avg_tat,avg_wt,TAT,WT;
 cout<<"Enter the no. of procss:"<<endl;
 cin>>n;
 for(int i=0;i<n;i++){
 cout<<"Enter the arrival time and burst time of process"<<i+1<<" ";
 cin>>at[i];
 cin>>bt[i];
 p[i]=i+1;
 }
 for(int i=0;i<n;i++){
 for(int j=0;j<n;j++){
 if(at[i]<at[j]){
 temp1=at[i];
 at[i]=at[j];
 at[j]=temp1;
 temp2=bt[i];
 bt[i]=bt[j];
 bt[j]=temp2;
 temp3=p[i];
 p[i]=p[j];
 p[j]=temp3;
 }
 }
 }
 cout<<"arranged order of process according to arrival time:"<<endl;
 for(int i=0;i<n;i++){
 cout<<"process"<<p[i]<<" "<<at[i]<<" "<<bt[i]<<endl;
 }
 complete=0;
 for(int i=0;i<n;i++){
 if(at[i]==0){
 wt[i]=at[i];
 complete=bt[i];
 tat[i]=complete-at[i];
 }
else if(at[i]>complete){
 complete++;
 i=i-1;
 }
 else{
 complete+=bt[i];
 tat[i]=complete-at[i];
 wt[i]=tat[i]-bt[i];
 }
 }
 for(int i=0;i<n;i++){
 TAT+=tat[i];
 WT+=wt[i];
 }
 avg_tat=TAT/n;
 avg_wt=WT/n;
 cout<<"process\t"<<"waiting\t"<<"tat\t"<<endl;
 for(int i=0;i<n;i++){
 cout<<p[i]<<"\t"<<wt[i]<<"\t"<<tat[i]<<endl;
 }
 //cout<<TAT<<" "<<WT<<endl;
 cout<<"Average turnaraound time is: "<<avg_tat<<endl;
 cout<<"Average waiting time is: "<<avg_wt<<endl;
}