C++ Eclipse Question

[JC0133]

First off I am running my program in Eclipse on Virtual box in Linux.

My program crashes when I add an additional array. I have not even used this array. So I am wondering if I am using too much memory.

Here are my data structures I create at the top of the program.

//used in task 0
class CFG_Rules {

public:
string LHS;
string RHS[500];
int ruleNumber;
};

//used in task 1
class CFG_Rules1 {

public:
string LHS;
string RHS[500];
int numberOfRHSeachRule;
};
//used in task 1
class FIRST_SETS {

public:
string firstSetsNonTerminals;
vector<string> vFirst;
set<string> sFirst;
int numberOfSets;
};

//used in task 1
class CFG_Rules2 {

public:
string LHS;
string RHS[500];
int numberOfRHSeachRule;
};

//used in task 2
class FOLLOW_SETS {
public:
string followSetsNonTerminals;
set<string> sFollow;
int numberOfFollowSets;
};



I create some arrays in main here

//creating data structure of rules
CFG_Rules myRules[1000];
//creating data structure of rules for task1
CFG_Rules1 myRules1[1000];
//creating data structure of First Sets for task 1
FIRST_SETS firstSets[1000];
//creating data structure of rules for task2
FOLLOW_SETS followSets[1000];

The issue comes here

the entire program works.

But once I create this array
CFG_Rules2 myRules2[1000];

The program crashes when I run it.

I don't even use this array. When I remove it, the program works when I run it.

Any ideas of what is happening?? Am I running out of memory in Eclipse??

 

[Ken g6]

1000 objects, each containing 500 strings, times at most 5? That's 2,500,000 strings. Which, on one hand, is a large number, but on the other hand, if the strings were 400 bytes, they'd all fit in a gigabyte.

You might be running out of stack space (for local variables), as opposed to heap space. If you create the rules arrays with new, you might find you have a lot more space. You could also delete the arrays when you're done with them, as their use appears to be sequential.

But do you really need a fixed size, for the inner arrays of Strings in particular?

 

[JC0133]

No I can simply use vectors

 

[mv2devnull]

You can use vectors. Good. Convert every plain array into a vector.