Initialize an array within a struct

[slicktacker]

Hi all,

I'm implementing a list of arrays like so:

struct Cell {
int arrayValues[5];
Cell *next;
};
Cell *head;

How do I write the structure such that all arrayValues are set to 0? I'm trying to use a for loop

for(int i = 0; i < 5; i++)
head->valueArray[i] = 0;
outside of the struct but I'm not sure what I'm doing. Thanks for your help!

[7stud]

That is what constructors are for:
#include <iostream>
using namespace std;

struct Cell
{
Cell()
{
for(int i=0; i<5; ++i)
{
data[i] = 0;
}

next = 0;

}

int data[5];
Cell* next;
};


int main ()
{
Cell c; //This statement calls the constructor
cout<<c.data[4]<<endl; //0

cout<<">>>Hit Enter to Quit";
cin.get();
return 0;
}


You can accomplish the same thing outside the struct like this:

#include <iostream>
using namespace std;

struct Cell
{
int data[5];
Cell* next;
};


int main ()
{
Cell c;

for(int i=0; i<5; ++i)
{
c.data[i] = 0;
}

c.next = 0;

cout<<c.data[4]<<endl; //0

cout<<">>>Hit Enter to Quit";
cin.get();
return 0;
}

[slicktacker]

Ah, thanks a lot! I never knew about constructors in structs. Thanks again!

[treuss]

I never knew about constructors in structs.C++ structs are exactly the same as C++ classes, with the tiny difference that the default visibility for struct members is public (private for class members).