May 4, 2012

C Program to implement FCFS algorithm.

Write a C Program to implement FCFS algorithm.
First Come First Served(FCFS) algorithm is the CPU scheduling algorithm. In FCFS process is served when they are arrived in order, i.e First In First Out(FIFO). FCFS is the simple scheduling algorithm, but it takes typically long/varying waiting time.
Read more about C Programming Language . and read the C Programming Language (2nd Edition) by K and R.

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#include<stdio.h>
#include<conio.h>
main()
{
    int n,i,j,sum=0;
    int arrv[10],ser[10],start[10];
    int finish[10],wait[10],turn[10];
    float avgturn=0.0,avgwait=0.0;
    start[0]=0;
    clrscr();
    printf("Enter the number of processes:");
    scanf("%d",&n);
    for(i=0;i<n;i++)
    {
        printf("Enter the arriwal and service time of %d process:",i+1);
        scanf("%d%d",&arrv[i],&ser[i]);
    }
    for(i=0;i<n;i++)
    {
        sum=0;
        for(j=0;j<i;j++)
        sum=sum+ser[j];
        start[i]=sum;
    }
    for(i=0;i<n;i++)
    {
        finish[i]=ser[i]+start[i];
        wait[i]=start[i];
        turn[i]=ser[i]+wait[i];
    }
    for(i=0;i<n;i++)
    {
        avgwait+=wait[i];
        avgturn+=turn[i];
    }
    avgwait/=n;
    avgturn/=n;
    printf("\narraival service Start Finish Wait Turn\n");
    for(i=0;i<n;i++)
    printf("%d\t%d\t%d\t%d\t%d\t%d\n",arrv[i],ser[i],start[i],
    finish[i],wait[i],turn[i]);
    printf("\nAverage waiting time=%f",avgwait);
    printf("\nAverage turn around time=%f",avgturn);
    getch();
}
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