Single Server Queueing System

#include<bits/stdc++.h>
#define M 100
#define sf(a) scanf("%d", &a)
#define pf(a) printf("%d", a)
#define sc scanf
#define pc printf
#define pb push_back
#define pi1 acos(-1)
#define pi2 3.14151317
#define loop0(i,n) for(i=0;i<n;i++)
#define loop1(i,n) for(i=0;i<n-1;i++)
/*
@ Author- Sabbir Ahmed Shibli
@ ID- 15101076
@ Department of CSE, University of Asia Pacific
*/
using namespace std;
int main()
{
    int n,i=0,sum=0;
    float avgWaitingTime,serverUtil;
    int interArrival[M];
    int arrivalTime[M];
    int serviceTime[M];
    int serviceBegins[M];
    int serviceEnds[M];
    int waitingTime[M];
    int idleTime[M];
    printf("Enter the amount of customers: ");
    scanf("%d", &n);
    loop0(i,n) {
        if(i==0)
            interArrival[i]=0;
        else
            interArrival[i]=rand()%n;
    }
    loop0(i,n) {
        serviceTime[i]=rand()%4+1;
    }
    loop0(i,n) {
        if(i==0)
            arrivalTime[i]=0;
        else
            arrivalTime[i]=arrivalTime[i-1]+interArrival[i];
    }
    loop0(i,n) {
        if(i==0) {
            serviceBegins[i]=0;
            serviceEnds[i]=serviceTime[0];
        }
        else {
            if(serviceEnds[i-1]>=arrivalTime[i])
                serviceBegins[i]=serviceEnds[i-1];
            else
                serviceBegins[i]=arrivalTime[i];
            serviceEnds[i]=serviceBegins[i]+serviceTime[i];
        }
    }
    loop0(i,n) {
        waitingTime[i]=serviceEnds[i]-serviceBegins[i];
    }
    loop0(i,n) {
        sum += waitingTime[i];
    }
    avgWaitingTime=sum/float(n);
    sum=0;
    loop1(i,n) {
        idleTime[i]=serviceBegins[i+1]-serviceEnds[i];
    }
    loop1(i,n) {
        sum+=idleTime[i];
    }
    serverUtil=((serviceEnds[n-1]-sum)/float(serviceEnds[n-1]))*100;

    /// Printing all the columns

    // Inter Arrival Time
    printf("InterArrival Time: ");
    loop0(i,n) {
        printf("%d ", interArrival[i]);
    }
    printf("\n");
    // Service Time
    printf("Service Time: ");
    loop0(i,n) {
        printf("%d ", serviceTime[i]);
    }
    printf("\n");
    // Arrival Time
    printf("Arrival Time: ");
    loop0(i,n) {
        printf("%d ", arrivalTime[i]);
    }
    printf("\n");
    // Service Begins
    printf("Service Beginning Time: ");
    loop0(i,n) {
        printf("%d ", serviceBegins[i]);
    }
    printf("\n");
    // Service Ends
    printf("Service Ending Time: ");
    loop0(i,n) {
        printf("%d ", serviceEnds[i]);
    }
    printf("\n");
    // Waiting Time
    printf("Waiting Time: ");
    loop0(i,n) {
        printf("%d ", waitingTime[i]);
    }
    printf("\n");
    printf("Average Waiting Time: %.02lf s.\n", avgWaitingTime);
    printf("Server Utilization: %.02lf %%\n", serverUtil);

    return 0;
}