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Machine Usage Problem

ISC 2004 Computer Science Practical, Question 3 · Simulation and records

The question

The manager of a company wants to analyse the machine usage from the records to find the utilization of the machine. He wants to know how long each user used the machine. When the user wants to use the machine he must login to the machine and after finishing the work he must log off the machine.

Each log record consists of:
 User identification number.
 Login time and date.
 Logout time and date.
Time consists of:
 Hours
 Minutes

Date consists of:
 Day
 Month

You may assume all logins and logouts are in the same year and there are 100 users at the most. The time format is 24 hour machine hours and minutes.

Design a program: (a) To find the duration for which each user has logged. Output all records along with the duration in hours (format hours: minutes).

(b) Output the record of the user who logged for the
    longest duration. You may assume that no user will
    login for more than 48 hours.

Test your program for the following data values and some more random data.

SAMPLE DATA:

INPUT:
Number of users: 3
USER            LOGIN           LOGOUT
IDENTIFICATION  TIME & DATE     TIME & DATE
149             20:10 20-12     2:50 21-12
173             12:30 20-12     12:30 21-12
142             16:20 20-12     16:30 20-12

OUTPUT:
USER            LOGIN           LOGOUT          DURATION
IDENTIFICATION  TIME & DATE     TIME & DATE     HOURS:MINS
149             20:10 20-12     2:50 21-12      6:40
173             12:30 20-12     12:30 21-12     24:00
142             16:20 20-12     16:30 20-12     00:10
THE USER WHO LOGGED IN FOR THE LONGEST DURATION
173             12:30 20-12     12:30 21-12     24:00

Question: ISC 2004 Computer Science Paper 2 (Practical), Question 3, set by the Council for the Indian School Certificate Examinations (CISCE). Solution and video: Vinay Singh.

Java solution

ISC2004Q3.java Download GitHub

import java.util.*;

class UserLog{
    private int id[];
    private String loginTime[], loginDate[], logoutTime[], logoutDate[];
    int duration[], maxIndex;
    private static int month[]={31,28,31,30,31,30,31,31,30,31,30,31};
    public UserLog(int id[],String loginTime[], String loginDate[], String logoutTime[],String logoutDate[]){
        this.id=id;
        this.loginTime=loginTime;
        this.loginDate=loginDate;
        this.logoutTime=logoutTime;
        this.logoutDate=logoutDate;
        duration = new int[id.length];
        process();
    }
    private void process(){
        String temp[];
        int hr, min, dd,mm,finalMinutes, initialMinutes, delta, maxDelta=0;
        for( int i=0; i<id.length; i++){
            temp = loginTime[i].split(":");
            hr=Integer.parseInt(temp[0]);
            min=Integer.parseInt(temp[1]);

            temp = loginDate[i].split("-");
            dd=Integer.parseInt(temp[0]);
            mm=Integer.parseInt(temp[1]);

            initialMinutes = getMinutes(dd, mm, hr, min);

            temp = logoutTime[i].split(":");
            hr=Integer.parseInt(temp[0]);
            min=Integer.parseInt(temp[1]);

            temp = logoutDate[i].split("-");
            dd=Integer.parseInt(temp[0]);
            mm=Integer.parseInt(temp[1]);

            finalMinutes = getMinutes(dd, mm, hr, min);
            delta = finalMinutes-initialMinutes;
            duration[i]=delta;
            if(delta>maxDelta){
                maxDelta=delta;
                maxIndex=i;
            }

        }
    }
    private static int getMinutes(int dd, int mm, int hr, int min){
        int days=dd;
        for( int i=0; i<mm-1;i++){
            days+=month[i];
        }
        return (days*24*60)+(hr*60)+min;
    }
    public String toString(){
        String output="";
        output+="USER\t\tLOGIN\t\tLOGOUT\tDURATION\n";
        output+="IDENTIFICATION\tTIME & DATE\tTIME & DATE\tHOURS:MINS\n";
        for( int i=0; i<id.length;i++){
            output+=id[i]+"\t\t"+loginTime[i]+" "+loginDate[i]+"\t"+logoutTime[i]+" "+logoutDate[i]+"\t"+formatTime(duration[i])+"\n";
        }
        output+="THE USER WHO LOGGED IN FOR THE LONGEST DURATION\n";
        output+=id[maxIndex]+"\t\t"+loginTime[maxIndex]+" "+loginDate[maxIndex]+"\t"+logoutTime[maxIndex]+" "+logoutDate[maxIndex]+"\t"+formatTime(duration[maxIndex])+"\n";
        return output;
    }
    private String formatTime(int minutes){
        int hr=minutes/60;
        int min = minutes%60;
        return hr+":"+min+(min<10?"0":"");
    }
}
public class ISC2004Q3 {
    public static void main(String[] args) {
        Scanner in = new Scanner( System.in );
        System.out.println("INPUT:");
        System.out.print("Number of users: ");
        int users = in.nextInt();
        int id[] = new int[users];
        String loginTime[] = new String[users];
        String loginDate[] = new String[users];
        String logoutTime[] = new String[users];
        String logoutDate[] = new String[users];
        System.out.println("USER\t\tLOGIN\t\tLOGOUT");
        System.out.println("IDENTIFICATION\tTIME & DATE\tTIME & DATE");
        for( int user=0; user<users; user++){
            id[user] = in.nextInt();
            loginTime[user] = in.next();
            loginDate[user] = in.next();
            logoutTime[user] = in.next();
            logoutDate[user] = in.next();
        }
        UserLog log = new UserLog(id, loginTime, loginDate,logoutTime,logoutDate);
    
        System.out.println("OUTPUT:\n"+log);


        in.close();
    }
}

Machine Usage Problem

The question

Java solution

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