CODEWITHSUNDEEP
c++arraysclassconstructor
limbostack
limbostack

Reputation: 13

How to create object arrays with classes that have constructors in C++

class Time {
private:
    int hour = 0;
    int minute = 0;
public:
    Time(int hour, int minute);
    void setHour(int hour);
    void setMinute(int minute);
    int getHour();
    int getMinute();
    void print();
    void advance();
};
Time::Time(int h, int m) // DONE
{
    hour = h;
    minute = m;
    if (hour > 23) 
    {
        hour = 0;
    }
    if (minute > 59) 
    {
        minute = 0;
    }
}
void Time::setHour(int h) // DONE
{
    if (h > 23) 
    {
        hour = 0;
    }
    else 
    {
        hour = h;
    }
}
void Time::setMinute(int m) // DONE
{
    if (m > 59) 
    {
        minute = 0;
    }
    else 
    {
        minute = m;
    }
}
int Time::getHour() // DONE
{
    return hour;
}
int Time::getMinute() // DONE
{
    return minute;
}
void Time::print() // DONE
{
    string period;
    string minutezero;
    
    if (hour > 12) 
    {
        hour = hour - 12;
        period = "PM";
    }
    else if (hour < 13) 
    {
        period = "AM";
    }
    if (hour == 0) 
    {
        hour = 12;
        period = "AM";
    }
    if (minute < 10)
    {
        cout << hour << ":" << "0" << minute << " " << period;
    }
    else if (minute > 9)
    {
        cout << hour << ":" << minute << " " << period;
    }

}
void Time::advance() // DONE
{
    minute = minute + 1;
    if (minute == 60) 
    {
        minute = 0;
        hour = hour + 1;
    }
    if (hour == 24) 
    {
        hour = 0;
    }
}

On my int main function, I would like to create an array like Time t[5] that will hold 5 time objects. How would I code this?

Here is what my module says word for word:

**Modify Time class to set up constructor(s) so the following Time objects can be created in the driver. Set up a Time array as specified below and print the times in the driver as well (can add to regular version and submit one version).

Time t1; // hour: 0, minute: 0, 12:00 AM

Time t2(8); // hour: 8, minute: 0, 8:00 AM

Time t3(13, 30); // hour: 13, minute: 30, 1:30 PM

Time t4(25, 5); // hour: 0, minute: 5, 12:05 AM

Time t4(12, 60); // hour: 12, minute: 0, 12:00 PMI**

Upvotes: 0

Views: 50

Answers (2)

3CxEZiVlQ
3CxEZiVlQ

Reputation: 38341

For example

#include <algorithm>
#include <vector>
#include <iterator>
 
int main(){
    std::vector<Time> t;
    std::fill_n(std::back_inserter(t), 5, Time(0, 0));
}

Or use pointers

std::array<std::unique_ptr<Time>, 5> t;  // std::unique_ptr<Time> t[5];

According to the requirement Time t1; // hour: 0, minute: 0, 12:00 AM you have to add and implement the default constructor Time::Time(), or yet better if you make only one Time::Time(int hour = 0, int minute = 0) with default parameter values.

A bit update:

class Time {
private:
    int hour = 0;
    int minute = 0;
public:
    Time(int hour = 0, int minute = 0);
    // skipped

Upvotes: 0

K. Gabor
K. Gabor

Reputation: 36

As paddy pointed out in a comment you need a default constructor that would look something like this:

Time::Time() : hour(0), minute(0) { }

And you also need a constructor with only the hour as a parameter

Time::Time(int h) : hour(h), minute(0) {
    if (hour > 23) hour = 0;
}

After that your class would look something like this

public:
    Time();
    Time(int h);
    Time(int hour, int minute);
    void setHour(int hour);
    ...

Upvotes: 1

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