C++ Program (Source Code) for Round Robin (RR) CPU Scheduling Algorithm

round-robin.cpp

/*
Compatible with C++, C++14, C++17
Tested at https://www.onlinegdb.com/online_c++_compiler
*/
#include <iostream>

using namespace std;
 
int main(){
     int i,j,k=0,p=0,q,temp,s=0,idle=0,done=0;
     float sum=0;
 
     //taking input
 
     cout<<"Please enter the number of proces : ";
     cin>>p;                                                       
 
     int a[p][4];
     int b[p][5];
 
     cout<<"Please enter the Time Quantum : ";
     cin>>q;
 
     cout<<"\n\nProcess\tArrival\tBurst\n-------\t-------\t-----\n";
     for(i=0;i<p;i++){
          for(j=0;j<3;j++){
               cin>>a[i][j];
               }
          a[i][3]=a[i][2];//storing total time of each process to another cell 
          }
 
     cout<<"\n\nTime-Line is as follows (Verticle View)....\n\n";
 
     i=a[0][1];
 
     while(done!=p){
          if(k==p)
               k=0;
 
          if(a[k][1]<=i){
               if(a[k][2]!=0){
                    if(a[k][2]>=q){
                         printf("%5d-----------\n        |p-%-4d|\n",i,a[k][0]);
                         a[k][2]-=q;
                         i+=q;
                         }
                    else{
                         printf("%5d-----------\n        |p-%-4d|\n",i,a[k][0]);
                         i+=a[k][2];
                         a[k][2]=0;
                         }
 
                    if(a[k][2]==0){
                         b[s][0]=a[k][0];
                         b[s][1]=a[k][1];
                         b[s][2]=i;
                         b[s][3]=a[k][3];
                         b[s][4]=((i-a[k][1])-a[k][3]);        
                         sum+=((i-a[k][1])-a[k][3]);
                         s++;
                         done++;
                         }
                    idle=0;
                    }
               k++;             
               }
          else{
               if(idle==0){
                    idle=1;
                    k=0;
                    }
               else if(idle==1){
                    printf("%5d-----------\n        |Idle  |\n",i); 
                    idle=2;
                    i++;     
                    }   
               else
                    i++;           
               }
          }
 
     printf("%5d-----------\n",i); 
 
     cout<<endl<<endl;
 
 
     cout<<"Table of processes with completion record as they were completed\n\n";
     cout<<"\n\nProcess\tArrival\tFinish\tTotal\tWait\n------------------------------------\n";
 
     for(i=0;i<s;i++)
          cout<<b[i][0]<<"\t"<<b[i][1]<<"\t"<<b[i][2]-1<<"\t"<<b[i][3]<<"\t"<<b[i][4]<<"\n";
 
     cout<<"\n\nAvg. Wait time = "<<sum/p<<endl<<endl;
     cout<<"__________________________________________________________\nProgrammed by : Tanmay Chakrabarty, onlineclassnotes.com.\n\n";
      
     //system("pause");
     return 0;
     }

@ishwarisonparote glad to know