CODEWITHSUNDEEP
c++oopconstructor
jonathan9879
jonathan9879

Reputation: 155

Constructor in for loop

I have just started with OO and I have a question about constructors. This would just create the same object "Team a" over and over with a different parameter i, correct?

for (int i = 1; i < n+1; i++) Team a (i); // construct teams

How can I create different "Teams", i.e. Team a, Team b ... Team h if I know how many teams there has to be? Can't the parameter i be the attribute and the name at the same time (Team 1, Team 2..)?

Thanks in advanced for any tip or help!

Pd: this is the constructor I'm using (if you need more code please write it in the comments):

public:
//constructors
Team(int n); // (this will set number to n and points, goals_scored, goals_lost to 0)

Upvotes: 0

Views: 3138

Answers (3)

Galik
Galik

Reputation: 48605

You can use a std::vector:

std::vector<Team> teams;

for(int i = 0; i < n; ++i)
    teams.emplace_back(i + 1); // makes Team(i + 1) in vector

Note: the std::vector uses zero based indexing so your team #1 is index 0:

teams[0]; // team #1
teams[1]; // team #2
teams[n]; // team #n + 1

Upvotes: 3

vcp
vcp

Reputation: 962

You would like to use map from STL:

std::map <string, Team> Teams;
for (int i = 1; i < n+1; i++)
{
  std::string noStr = std::to_string(i);
  std::string teamName = "Team " + noStr; // "Team 1", "Team 2", ..., "Team N"
  Teams[teamName] = Team(i); // Store Team object in the map 
}

Now you can access any team using its name :

// For team 5 object
Teams["Team 5"]

Upvotes: 1

MagunRa
MagunRa

Reputation: 563

1st question: yes it would produce n times a variable a of type Team. But(!) It is local to the for loop at each iteration. You wont be able to use them later.

2nd question: pure numbers cant be names. This does not work: 

int 1 = 1; // not(!) valid

You can use something like this:

int a_1 = 1 ;
int a_2 = 2;

But you can't produce this by a variable:

for (int i = 1; i < n+1; i++){
    int a_i = 1; // defines a local variable "a_i" 
    int i = i ;// not valid i is already defined
}

You should use a container (e.g. a vector) of teams.

Upvotes: 0

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