C/C++ Program for First Come First Served (FCFS) Scheduling Algorithm

Here you will get a C/C++ program for first come first served (fcfs) scheduling algorithm.

What is First Come First Served (FCFS) Scheduling Algorithm?

First Come First Served (FCFS) is a Non-Preemptive scheduling algorithm. FIFO (First In First Out) methodology

allocates need to process in the request in which they demand the processor.

The procedure that demands the CPU first is distributed the CPU first. This is effectively actualized with a FIFO line for dealing with the undertakings. As the procedure

come in, they are put toward the finish of the line. As the CPU completes each errand, it expels it

from the beginning of the line and heads on to the following undertaking.

C Program

#include<stdio.h>
 
int main()
{
    int n,bt[20],wt[20],tat[20],avwt=0,avtat=0,i,j;
    printf("Enter total number of processes(maximum 20):");
    scanf("%d",&n);
 
    printf("\nEnter Process Burst Time\n");
    for(i=0;i<n;i++)
    {
        printf("P[%d]:",i+1);
        scanf("%d",&bt[i]);
    }
 
    wt[0]=0;    //waiting time for first process is 0
 
    //calculating waiting time
    for(i=1;i<n;i++)
    {
        wt[i]=0;
        for(j=0;j<i;j++)
            wt[i]+=bt[j];
    }
 
    printf("\nProcess\t\tBurst Time\tWaiting Time\tTurnaround Time");
 
    //calculating turnaround time
    for(i=0;i<n;i++)
    {
        tat[i]=bt[i]+wt[i];
        avwt+=wt[i];
        avtat+=tat[i];
        printf("\nP[%d]\t\t%d\t\t%d\t\t%d",i+1,bt[i],wt[i],tat[i]);
    }
 
    avwt/=i;
    avtat/=i;
    printf("\n\nAverage Waiting Time:%d",avwt);
    printf("\nAverage Turnaround Time:%d",avtat);
 
    return 0;
}

C++ Program

#include<iostream>
 
using namespace std;
 
int main()
{
    int n,bt[20],wt[20],tat[20],avwt=0,avtat=0,i,j;
    cout<<"Enter total number of processes(maximum 20):";
    cin>>n;
 
    cout<<"\nEnter Process Burst Time\n";
    for(i=0;i<n;i++)
    {
        cout<<"P["<<i+1<<"]:";
        cin>>bt[i];
    }
 
    wt[0]=0;    //waiting time for first process is 0
 
    //calculating waiting time
    for(i=1;i<n;i++)
    {
        wt[i]=0;
        for(j=0;j<i;j++)
            wt[i]+=bt[j];
    }
 
    cout<<"\nProcess\t\tBurst Time\tWaiting Time\tTurnaround Time";
 
    //calculating turnaround time
    for(i=0;i<n;i++)
    {
        tat[i]=bt[i]+wt[i];
        avwt+=wt[i];
        avtat+=tat[i];
        cout<<"\nP["<<i+1<<"]"<<"\t\t"<<bt[i]<<"\t\t"<<wt[i]<<"\t\t"<<tat[i];
    }
 
    avwt/=i;
    avtat/=i;
    cout<<"\n\nAverage Waiting Time:"<<avwt;
    cout<<"\nAverage Turnaround Time:"<<avtat;
 
    return 0;
}

Output

Remark underneath in the event that you discovered anything erroneous or missing in above fcfs program in C and C++.