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Call by reference

CPlusPlusAnnoyed (11)
This program is supposed to be scoring goals. The first two, eichel and kane are different from the last one, hodgson. A function was added to main called score_goals, it can't be apart of the member functions. Anyways, score_goals (hodgson, 7) gets hodgson to score 7 goals and when I put in hodgson.print() the 7 goals are supposed to be referenced there as well but when I make void score_goals (Hockey player, int &goals) call by reference like it should be, it doesn't work. It says that there's an error.

main
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#include <cstdlib>
#include <iostream>
#include "Hockey.h"
using namespace std;


void tripping ();
void fighting ();
void score_goal ();
void assist_goal ();
void print ();
void score_goals (Hockey player, int &goals);
      
int main(int argc, char *argv[])
{
	Hockey eichel, kane, hodgson;
	
	
    cout << "Eichel stats: ";
    eichel.score_goal ();
    eichel.score_goal ();
    eichel.assist_goal ();
    eichel.tripping ();
    eichel.print ();

    cout << "\n\nKane stats: ";
	kane.assist_goal ();
	kane.assist_goal ();
	kane.assist_goal ();
	kane.fighting ();
	kane.fighting ();
	kane.print ();
	
	score_goals (hodgson, 7);
	cout << "\n\nHodgson stats: ";
	hodgson.print();
	
    cout << "\n\n";
    system("PAUSE");
    return EXIT_SUCCESS;
}

void score_goals (Hockey player, int &goals)
	{
		int count;
		for (count = 0; count < goals; count++)
			player.score_goal();
		cout << "\n\nPlayer in function: ";
		player.print ();
		cout <<"\n\n";
	}


header
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#include <iostream>
using namespace std;

// Hockey class keeping track of a player's goals, assists,
// penalties and penalty minutes
class Hockey
{
      private:
        int goals,            // number of goals
            assists,          // number of assists
            penalties,        // number of penalties
            penalty_minutes;  // total of penalty minutes
      public:
         Hockey (); 
         void tripping ();
         void fighting ();
         void score_goal ();
         void assist_goal ();
         void print ();
};

// Records the fact that the player has scored another goal
void Hockey::score_goal ()
{
     goals++;
}

Hockey::Hockey ()
{
     goals=0;
     assists=0;
     penalties=0;
     penalty_minutes=0;
}

void Hockey::tripping ()
{
     penalties++;
     penalty_minutes += 2;
     
}

void Hockey::fighting ()
{
     penalties++;
     penalty_minutes++;
     penalty_minutes++;
     penalty_minutes++;
     penalty_minutes++;
     penalty_minutes++;
}

void Hockey::assist_goal ()
{
     assists++;
}

// Prints the player's current statistics
void Hockey::print ()
{
     cout << "\n\nGoals:   " << goals;
     cout << "\nAssists: " << assists;
     if (penalties == 1)
       cout << "\n" << penalties << " penalty for " 
            << penalty_minutes << " minutes.";
     else
        cout << "\n" << penalties << " penalties for " 
          << penalty_minutes << " minutes.";
}
Last edited on
Zhuge (4664)
Why do you have to pass goals by reference? Do you understand what that is supposed to mean?
CPlusPlusAnnoyed (11)
Yes I understand what it means but my professor told me that it has to be passed by reference. I didn't understand it myself. If score_goals was made apart of the member functions then things would be accomplished much more easily but he requested it to be by reference.
MikeyBoy (5631)
I'm not sure you do understand what it means. If you did, you'd understand why:

 
 
score_goals (hodgson, 7);


can't possibly make any sense. How would a reference to an integer literal possibly work? What is it that you think you're doing here?
Last edited on
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