CPU scheduling algorithm

[shawinke]

Hi all pls help me with the soln to this probelm, the catch is the interface (menu) needs to be Built in C++ as well.
any suggestions would be of great help as well.

thanks

It is a system written using a structured programming language (e.g. C, Turbo C) that simulates the following CPU Scheduling Algorithms:
• First Come First Serve
• Shortest Job First
• Round Robin
• Shortest Remaining Time First
The user must be given the option to choose from any of the algorithms (Menu). Jobs arrive in the queue through manual input with the following required information:

Job No. CPU Burst Time Arrival Time Status
1
2
3
4
5

Status can be Pending, Processing, Finished.

The system should be able to check for invalid inputs and provide appropriate error messages to the user.

The system then shows the movement of each job in the system (from the ready queue up to when it exits the system) plus drawing the GANTT Chart simultaneously.

At the end of the simulation, the system displays the following information:
• Waiting time for each job;
• Turnaround time for each job;
• Average waiting time for the system; and
• Average turnaround time for the system.

The system then asks the user if he wants to simulate the same algorithm, simulate another algorithm, or to quit the system.

[Ancient Dragon]

Now that you posted the requirements of the program, what do you want from us? We will not write your program for you.

[suganya4488]

i want the source code of CPU scheduling algorithm ( FCFS, SJF, priority ) in C++ language i need tis for my mini project

[Ancient Dragon]

And I'd like to have Bill Gates' $65 Million home :) (Actually not -- taxes and utilities are too expensive).

[payal garg]

i want the source code for cpu scheduling algorithms in c++

[Ancient Dragon]

while(true)
{
   Read previous post;
}

[sunny7]

ENJOY BUDDY:)
CODE:

// Header file for Cpu scheduling


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

class cpuschedule
{
	int n,Bu[20];
	float Twt,Awt,A[10],Wt[10],w;
public:
	//Getting the No of processes & burst time
	void Getdata();
	//First come First served Algorithm
	void Fcfs();
	//Shortest job First Algorithm
	void Sjf();
	//Shortest job First Algorithm with Preemption
	void SjfP();
	//Shortest job First Algorithm with NonPreemption
	void SjfNp();
	//Round Robin Algorithm
	void RoundRobin();
	//Priority Algorithm
	void Priority();
};
// Implementation file for Cpu scheduling

#include"cpuh.h"
//Getting no of processes and Burst time
void cpuschedule::Getdata()
{
	int i;
	cout<<"Enter the no of processes:";
	cin>>n;
	for(i=1;i<=n;i++)
	{
		cout<<"Enter The BurstTime for Process p"<<i<<"=	";
		cin>>Bu[i];
	}
}

//First come First served Algorithm
void cpuschedule::Fcfs()
{
	int i,B[10];
	Twt=0.0;
	for(i=1;i<=n;i++)
	{
		B[i]=Bu[i];
		cout<<"Burst time for process p"<<i<<"=	";
		cout<<B[i];
	}
	Wt[1]=0;
	for(i=2;i<=n;i++)
	{
		Wt[i]=B[i-1]+Wt[i-1];
	}

	//Calculating Average Weighting Time
	for(i=1;i<=n;i++)
		Twt=Twt+Wt[i];
	Awt=Twt/n;
	cout<<"Total   Weighting Time="<<Twt;
	cout<<"Average Weighting Time="<<Awt<<"";
}

//Shortest job First Algorithm
void cpuschedule::Sjf()
{
	int i,j,temp,B[10];
	Twt=0.0;
	for(i=1;i<=n;i++)
	{
		B[i]=Bu[i];
		cout<<"Burst time for process p"<<i<<"=	";
		cout<<B[i];
	}
	for(i=n;i>=1;i--)
	{
		for(j=1;j<=n;j++)
		{
			if(B[j-1]>B[j])
			{
				temp=B[j-1];
				B[j-1]=B[j];
				B[j]=temp;
			}
		}
	}

	Wt[1]=0;
	for(i=2;i<=n;i++)
	{
		Wt[i]=B[i-1]+Wt[i-1];
	}
	//calculating Average Weighting Time
	for(i=1;i<=n;i++)
		Twt=Twt+Wt[i];
	Awt=Twt/n;
	cout<<"Total   Weighting Time="<<Twt;
	cout<<"Average Weighting Time="<<Awt<<"";
}

//Shortest job First Algorithm with NonPreemption

void cpuschedule::SjfNp()
{
	int i,B[10],Tt=0,temp,j;
	char S[10];
	float A[10],temp1,t;
	Twt=0.0;
	w=0.0;
	for(i=1;i<=n;i++)
	{
		B[i]=Bu[i];
		cout<<"Burst time for process p"<<i<<"=	";
		cout<<B[i];
		S[i]='T';
		Tt=Tt+B[i];
		cout<<"Enter the Arrival Time for"<<i<<"th process=	";
		cin>>A[i];
	}

	for(i=n;i>=1;i--)
	{
		for(j=3;j<=n;j++)
		{
			if(B[j-1]>B[j])
			{
				temp=B[j-1];
				temp1=A[j-1];
				B[j-1]=B[j];
				A[j-1]=A[j];
				B[j]=temp;
				A[j]=temp1;
			}
		}
	}

	for(i=1;i<=n;i++)
	{
		cout<<"p"<<i<<"	"<<B[i]<<"	"<<A[i];
	}

	//For the 1st process
		Wt[1]=0;
		w=w+B[1];
		t=w;
		S[1]='F';

		while(w<Tt)
		{
			i=2;
			while(i<=n)
			{
				if(S[i]=='T'&&A[i]<=t)
				{
					Wt[i]=w;
					cout<<"WT"<<i<<"="<<Wt[i];
					S[i]='F';
					w=w+B[i];
					t=w;
					i=2;
				}
				else
					i++;
			}
		}

		for(i=1;i<=n;i++)
			cout<<"Wt"<<i<<"=="<<Wt[i];


		//calculating average weighting Time
		for(i=1;i<=n;i++)
			Twt=Twt+(Wt[i]-A[i]);
		Awt=Twt/n;
	cout<<"Total   Weighting Time="<<Twt<<"";
	cout<<"Average Weighting Time="<<Awt<<"";
}

//Priority Algorithm

void cpuschedule::Priority()
{
	int i,B[10],P[10],j;
	w=0.0;
	int max;
	Twt=0.0;
	max=1;
	for(i=1;i<=n;i++)
	{
		B[i]=Bu[i];
		cout<<"Burst time for process p"<<i<<"=	";
		cout<<B[i];
		cout<<"Enter the priority for process P"<<i<<"=	";
		cin>>P[i];
		if(max<P[i])
			max=P[i];
	}
	j=1;
	while(j<=max)
	{
		i=1;
		while(i<=n)
		{
			if(P[i]==j)
			{
				Wt[i]=w;
				w=w+B[i];
			}
			i++;
		}
		j++;
	}

	//calculating average weighting Time
	for(i=1;i<=n;i++)
		Twt=Twt+Wt[i];
	Awt=Twt/n;
	cout<<"Total   Weighting Time="<<Twt<<"";
	cout<<"Average Weighting Time="<<Awt<<"";
}

//Shortest job First Algorithm with Preemption
void cpuschedule::SjfP()
{
	int i,j,m,Wt[10],k,B[10],A[10],Tt=0,Wtm[10],temp;
	char S[20],start[20];
	int max=0,Time=0,min;
	float Twt=0.0,Awt;
	for(i=1;i<=n;i++)
	{
		B[i]=Bu[i];
		cout<<"Burst time for process P"<<i<<"=	"<<B[i];
		if(B[i]>max)
			max=B[i];
		Wt[i]=0;
		S[i]='T';
		start[i]='F';
		Tt=Tt+B[i];
		cout<<"Enter the Arrival Time for"<<i<<"th process=	";
		cin>>A[i];
		if(A[i]>Time)
			Time=A[i];
	}
	//cout<<"Max="<<max;
	int w=0,flag=0,t=0;
	i=1;
	while(t<Time)
	{
		if(A[i]<=t && B[i]!=0)
		{
			if(flag==0)
			{
				Wt[i]=Wt[i]+w;
				cout<<"Wt["<<i<<"]="<<Wt[i];
			}
			B[i]=B[i]-1;
			if(B[i]==0)
				S[i]='F';
			start[i]='T';
			t++;
			w=w+1;
			if(S[i]!='F')
			{
				j=1;flag=1;
				while(j<=n && flag!=0)
				{
					if(S[j]!='F' && B[i]>B[j] && A[j]<=t && i!=j )
					{
						flag=0;
						Wt[i]=Wt[i]-w;
						i=j;
					}
					else
					{
						flag=1;
					}
					j++;
				}
			}
			else
			{
				i++;
				j=1;
				while(A[j]<=t &&j<=n)
				{
					if(B[i]>B[j] && S[j]!='F')
					{
						flag=0;
						i=j;
					}
					j++;
				}
			}
		}
		else
			if(flag==0)
			i++;
	}


	cout<<"Printing remaining burst time";
	for(i=1;i<=n;i++)
		cout<<"B["<<i<<"]="<<B[i];
	cout<<"";

	while(w<Tt)
	{
		min=max+1;
		i=1;
		while(i<=n)
		{
			if(min>B[i] && S[i]=='T')
			{
				min=B[i];
				j=i;
			}
			i++;
		}
		i=j;
		if(w==Time && start[i]=='T')
		{
			w=w+B[i];
			S[i]='F';
		}
		else
		{
			Wt[i]=Wt[i]+w;
			w=w+B[i];
			S[i]='F';
		}
	}

cout<<"Weight info";

	for(i=1;i<=n;i++)
		cout<<"WT["<<i<<"]="<<Wt[i];
cout<<"after subtracting arrival time";
	for(i=1;i<=n;i++)
	{
		Wt[i]=Wt[i]-A[i];
		cout<<"WT["<<i<<"]="<<Wt[i];
	}
	//Calculating Average Weighting time
	for(i=1;i<=n;i++)
		Twt=Twt+Wt[i];
	Awt=Twt/n;
	cout<<"Average Weighting Time="<<Awt;



}

//Round Robin Algorithm
void cpuschedule::RoundRobin()
{

	int i,j,tq,k,B[10],Rrobin[10][10],count[10];
	int max=0;
	int m;
	Twt=0.0;
	for(i=1;i<=n;i++)
	{
		B[i]=Bu[i];
		cout<<"Burst time for process p"<<i<<"=	";
		cout<<B[i];
		if(max<B[i])
			max=B[i];
		Wt[i]=0;
	}
	cout<<"Enter the Time Quantum=";
	cin>>tq;
	//TO find the dimension of the Rrobin array
	m=max/tq+1;

	//initializing Rrobin array
	for(i=1;i<=n;i++)
	{
		for(j=1;j<=m;j++)
		{
			Rrobin[i][j]=0;
		}
	}
	//placing value in the Rrobin array
	i=1;
	while(i<=n)
	{
		j=1;
		while(B[i]>0)
		{
			if(B[i]>=tq)
			{
				B[i]=B[i]-tq;
				Rrobin[i][j]=tq;
				j++;
			}
			else
			{
				Rrobin[i][j]=B[i];
				B[i]=0;
				j++;
			}
		}
		count[i]=j-1;
		i++;
	}

	cout<<"Display";
	for(i=1;i<=n;i++)
	{
		for(j=1;j<=m;j++)
		{
			cout<<"Rr["<<i<<","<<j<<"]="<<Rrobin[i][j];
			cout<<"	";
		}
		cout<<"";
	}
	//calculating weighting time
	int x=1;
	i=1;
	while(x<=n)
	{
		for(int a=1;a<x;a++)
		{
			Wt[x]=Wt[x]+Rrobin[a][i];
		}
		i=1;
		int z=x;
		j=count[z];
		k=1;
		while(k<=j-1)
		{
			if(i==n+1)
			{
				i=1;
				k++;
			}
			else
			{
				if(i!=z)
				{
					Wt[z]=Wt[z]+Rrobin[i][k];
				}
				i++;
			}
		}
		x++;
	}
	for(i=1;i<=n;i++)
		cout<<"Weighting Time for process P"<<i<<"="<<Wt[i];

	//calculating Average Weighting Time
	for(i=1;i<=n;i++)
		Twt=Twt+Wt[i];
	Awt=Twt/n;
	cout<<"Total   Weighting Time="<<Twt;
	cout<<"Average Weighting Time="<<Awt<<"";
}

//Application file for cpu Scheduling
#include "cpuh.h"

void main()
{
	int ch,cho;
	cpuschedule c;
	do
	{
		cout<<"				 MENU";
		cout<<"1.Getting BurstTime";
		cout<<"2.FirstComeFirstServed";
		cout<<"3.ShortestJobFirst";
		cout<<"4.RoundRobin";
		cout<<"5.Priority";
		cout<<"6.EXIT";
		cout<<"Enter your choice";
		cin>>ch;
		switch(ch)
		{
		case 1:
			c.Getdata();
			break;
		case 2:
			cout<<"FIRST COME FIRST SERVED SCHEDULING";
			c.Fcfs();
			break;
		case 3:
			cout<<"SHORTEST JOB FIRST SCHEDULING";
			do
			{
				cout<<"1.SJF-Normel";
				cout<<"2.SJF-Preemptive";
				cout<<"3.SJF-NonPreemptive";
				cout<<"Enter your choice";
				cin>>cho;
				switch(cho)
				{
				case 1:
					c.Sjf();
					break;
				case 2:
					c.SjfP();
					break;
				case 3:
					c.SjfNp();
					break;
				}
			}while(cho<=3);
			break;
		case 4:
			cout<<"ROUND ROBIN SCHEDULING";
			c.RoundRobin();
			break;
		case 5:
			cout<<"PRIORITY SCHEDULING";
			c.Priority();
			break;
		case 6:
			break;
		}
	}while(ch<=5);
}

[sunny7]

// Header file for Cpu scheduling


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

class cpuschedule
{
	int n,Bu[20];
	float Twt,Awt,A[10],Wt[10],w;
public:
	//Getting the No of processes & burst time
	void Getdata();
	//First come First served Algorithm
	void Fcfs();
	//Shortest job First Algorithm
	void Sjf();
	//Shortest job First Algorithm with Preemption
	void SjfP();
	//Shortest job First Algorithm with NonPreemption
	void SjfNp();
	//Round Robin Algorithm
	void RoundRobin();
	//Priority Algorithm
	void Priority();
};
// Implementation file for Cpu scheduling

#include"cpuh.h"
//Getting no of processes and Burst time
void cpuschedule::Getdata()
{
	int i;
	cout<<"Enter the no of processes:";
	cin>>n;
	for(i=1;i<=n;i++)
	{
		cout<<"Enter The BurstTime for Process p"<<i<<"=	";
		cin>>Bu[i];
	}
}

//First come First served Algorithm
void cpuschedule::Fcfs()
{
	int i,B[10];
	Twt=0.0;
	for(i=1;i<=n;i++)
	{
		B[i]=Bu[i];
		cout<<"Burst time for process p"<<i<<"=	";
		cout<<B[i];
	}
	Wt[1]=0;
	for(i=2;i<=n;i++)
	{
		Wt[i]=B[i-1]+Wt[i-1];
	}

	//Calculating Average Weighting Time
	for(i=1;i<=n;i++)
		Twt=Twt+Wt[i];
	Awt=Twt/n;
	cout<<"Total   Weighting Time="<<Twt;
	cout<<"Average Weighting Time="<<Awt<<"";
}

//Shortest job First Algorithm
void cpuschedule::Sjf()
{
	int i,j,temp,B[10];
	Twt=0.0;
	for(i=1;i<=n;i++)
	{
		B[i]=Bu[i];
		cout<<"Burst time for process p"<<i<<"=	";
		cout<<B[i];
	}
	for(i=n;i>=1;i--)
	{
		for(j=1;j<=n;j++)
		{
			if(B[j-1]>B[j])
			{
				temp=B[j-1];
				B[j-1]=B[j];
				B[j]=temp;
			}
		}
	}

	Wt[1]=0;
	for(i=2;i<=n;i++)
	{
		Wt[i]=B[i-1]+Wt[i-1];
	}
	//calculating Average Weighting Time
	for(i=1;i<=n;i++)
		Twt=Twt+Wt[i];
	Awt=Twt/n;
	cout<<"Total   Weighting Time="<<Twt;
	cout<<"Average Weighting Time="<<Awt<<"";
}

//Shortest job First Algorithm with NonPreemption

void cpuschedule::SjfNp()
{
	int i,B[10],Tt=0,temp,j;
	char S[10];
	float A[10],temp1,t;
	Twt=0.0;
	w=0.0;
	for(i=1;i<=n;i++)
	{
		B[i]=Bu[i];
		cout<<"Burst time for process p"<<i<<"=	";
		cout<<B[i];
		S[i]='T';
		Tt=Tt+B[i];
		cout<<"Enter the Arrival Time for"<<i<<"th process=	";
		cin>>A[i];
	}

	for(i=n;i>=1;i--)
	{
		for(j=3;j<=n;j++)
		{
			if(B[j-1]>B[j])
			{
				temp=B[j-1];
				temp1=A[j-1];
				B[j-1]=B[j];
				A[j-1]=A[j];
				B[j]=temp;
				A[j]=temp1;
			}
		}
	}

	for(i=1;i<=n;i++)
	{
		cout<<"p"<<i<<"	"<<B[i]<<"	"<<A[i];
	}

	//For the 1st process
		Wt[1]=0;
		w=w+B[1];
		t=w;
		S[1]='F';

		while(w<Tt)
		{
			i=2;
			while(i<=n)
			{
				if(S[i]=='T'&&A[i]<=t)
				{
					Wt[i]=w;
					cout<<"WT"<<i<<"="<<Wt[i];
					S[i]='F';
					w=w+B[i];
					t=w;
					i=2;
				}
				else
					i++;
			}
		}

		for(i=1;i<=n;i++)
			cout<<"Wt"<<i<<"=="<<Wt[i];


		//calculating average weighting Time
		for(i=1;i<=n;i++)
			Twt=Twt+(Wt[i]-A[i]);
		Awt=Twt/n;
	cout<<"Total   Weighting Time="<<Twt<<"";
	cout<<"Average Weighting Time="<<Awt<<"";
}

//Priority Algorithm

void cpuschedule::Priority()
{
	int i,B[10],P[10],j;
	w=0.0;
	int max;
	Twt=0.0;
	max=1;
	for(i=1;i<=n;i++)
	{
		B[i]=Bu[i];
		cout<<"Burst time for process p"<<i<<"=	";
		cout<<B[i];
		cout<<"Enter the priority for process P"<<i<<"=	";
		cin>>P[i];
		if(max<P[i])
			max=P[i];
	}
	j=1;
	while(j<=max)
	{
		i=1;
		while(i<=n)
		{
			if(P[i]==j)
			{
				Wt[i]=w;
				w=w+B[i];
			}
			i++;
		}
		j++;
	}

	//calculating average weighting Time
	for(i=1;i<=n;i++)
		Twt=Twt+Wt[i];
	Awt=Twt/n;
	cout<<"Total   Weighting Time="<<Twt<<"";
	cout<<"Average Weighting Time="<<Awt<<"";
}

//Shortest job First Algorithm with Preemption
void cpuschedule::SjfP()
{
	int i,j,m,Wt[10],k,B[10],A[10],Tt=0,Wtm[10],temp;
	char S[20],start[20];
	int max=0,Time=0,min;
	float Twt=0.0,Awt;
	for(i=1;i<=n;i++)
	{
		B[i]=Bu[i];
		cout<<"Burst time for process P"<<i<<"=	"<<B[i];
		if(B[i]>max)
			max=B[i];
		Wt[i]=0;
		S[i]='T';
		start[i]='F';
		Tt=Tt+B[i];
		cout<<"Enter the Arrival Time for"<<i<<"th process=	";
		cin>>A[i];
		if(A[i]>Time)
			Time=A[i];
	}
	//cout<<"Max="<<max;
	int w=0,flag=0,t=0;
	i=1;
	while(t<Time)
	{
		if(A[i]<=t && B[i]!=0)
		{
			if(flag==0)
			{
				Wt[i]=Wt[i]+w;
				cout<<"Wt["<<i<<"]="<<Wt[i];
			}
			B[i]=B[i]-1;
			if(B[i]==0)
				S[i]='F';
			start[i]='T';
			t++;
			w=w+1;
			if(S[i]!='F')
			{
				j=1;flag=1;
				while(j<=n && flag!=0)
				{
					if(S[j]!='F' && B[i]>B[j] && A[j]<=t && i!=j )
					{
						flag=0;
						Wt[i]=Wt[i]-w;
						i=j;
					}
					else
					{
						flag=1;
					}
					j++;
				}
			}
			else
			{
				i++;
				j=1;
				while(A[j]<=t &&j<=n)
				{
					if(B[i]>B[j] && S[j]!='F')
					{
						flag=0;
						i=j;
					}
					j++;
				}
			}
		}
		else
			if(flag==0)
			i++;
	}


	cout<<"Printing remaining burst time";
	for(i=1;i<=n;i++)
		cout<<"B["<<i<<"]="<<B[i];
	cout<<"";

	while(w<Tt)
	{
		min=max+1;
		i=1;
		while(i<=n)
		{
			if(min>B[i] && S[i]=='T')
			{
				min=B[i];
				j=i;
			}
			i++;
		}
		i=j;
		if(w==Time && start[i]=='T')
		{
			w=w+B[i];
			S[i]='F';
		}
		else
		{
			Wt[i]=Wt[i]+w;
			w=w+B[i];
			S[i]='F';
		}
	}

cout<<"Weight info";

	for(i=1;i<=n;i++)
		cout<<"WT["<<i<<"]="<<Wt[i];
cout<<"after subtracting arrival time";
	for(i=1;i<=n;i++)
	{
		Wt[i]=Wt[i]-A[i];
		cout<<"WT["<<i<<"]="<<Wt[i];
	}
	//Calculating Average Weighting time
	for(i=1;i<=n;i++)
		Twt=Twt+Wt[i];
	Awt=Twt/n;
	cout<<"Average Weighting Time="<<Awt;



}

//Round Robin Algorithm
void cpuschedule::RoundRobin()
{

	int i,j,tq,k,B[10],Rrobin[10][10],count[10];
	int max=0;
	int m;
	Twt=0.0;
	for(i=1;i<=n;i++)
	{
		B[i]=Bu[i];
		cout<<"Burst time for process p"<<i<<"=	";
		cout<<B[i];
		if(max<B[i])
			max=B[i];
		Wt[i]=0;
	}
	cout<<"Enter the Time Quantum=";
	cin>>tq;
	//TO find the dimension of the Rrobin array
	m=max/tq+1;

	//initializing Rrobin array
	for(i=1;i<=n;i++)
	{
		for(j=1;j<=m;j++)
		{
			Rrobin[i][j]=0;
		}
	}
	//placing value in the Rrobin array
	i=1;
	while(i<=n)
	{
		j=1;
		while(B[i]>0)
		{
			if(B[i]>=tq)
			{
				B[i]=B[i]-tq;
				Rrobin[i][j]=tq;
				j++;
			}
			else
			{
				Rrobin[i][j]=B[i];
				B[i]=0;
				j++;
			}
		}
		count[i]=j-1;
		i++;
	}

	cout<<"Display";
	for(i=1;i<=n;i++)
	{
		for(j=1;j<=m;j++)
		{
			cout<<"Rr["<<i<<","<<j<<"]="<<Rrobin[i][j];
			cout<<"	";
		}
		cout<<"";
	}
	//calculating weighting time
	int x=1;
	i=1;
	while(x<=n)
	{
		for(int a=1;a<x;a++)
		{
			Wt[x]=Wt[x]+Rrobin[a][i];
		}
		i=1;
		int z=x;
		j=count[z];
		k=1;
		while(k<=j-1)
		{
			if(i==n+1)
			{
				i=1;
				k++;
			}
			else
			{
				if(i!=z)
				{
					Wt[z]=Wt[z]+Rrobin[i][k];
				}
				i++;
			}
		}
		x++;
	}
	for(i=1;i<=n;i++)
		cout<<"Weighting Time for process P"<<i<<"="<<Wt[i];

	//calculating Average Weighting Time
	for(i=1;i<=n;i++)
		Twt=Twt+Wt[i];
	Awt=Twt/n;
	cout<<"Total   Weighting Time="<<Twt;
	cout<<"Average Weighting Time="<<Awt<<"";
}

//Application file for cpu Scheduling
#include "cpuh.h"

void main()
{
	int ch,cho;
	cpuschedule c;
	do
	{
		cout<<"				 MENU";
		cout<<"1.Getting BurstTime";
		cout<<"2.FirstComeFirstServed";
		cout<<"3.ShortestJobFirst";
		cout<<"4.RoundRobin";
		cout<<"5.Priority";
		cout<<"6.EXIT";
		cout<<"Enter your choice";
		cin>>ch;
		switch(ch)
		{
		case 1:
			c.Getdata();
			break;
		case 2:
			cout<<"FIRST COME FIRST SERVED SCHEDULING";
			c.Fcfs();
			break;
		case 3:
			cout<<"SHORTEST JOB FIRST SCHEDULING";
			do
			{
				cout<<"1.SJF-Normel";
				cout<<"2.SJF-Preemptive";
				cout<<"3.SJF-NonPreemptive";
				cout<<"Enter your choice";
				cin>>cho;
				switch(cho)
				{
				case 1:
					c.Sjf();
					break;
				case 2:
					c.SjfP();
					break;
				case 3:
					c.SjfNp();
					break;
				}
			}while(cho<=3);
			break;
		case 4:
			cout<<"ROUND ROBIN SCHEDULING";
			c.RoundRobin();
			break;
		case 5:
			cout<<"PRIORITY SCHEDULING";
			c.Priority();
			break;
		case 6:
			break;
		}
	}while(ch<=5);
}

[KUMARI_3]

how to include context switching time input by the user?

[rproffitt]

For KUMARI.

Please read the entire thread. Also, consider https://www.cs.uic.edu/~jbell/CourseNotes/OperatingSystems/6_CPU_Scheduling.html