Access members of linked list array passed to function

Question

I am using visual studio for C, where I am making an array of Nodes containing int datatypes (startCount and endCount) from a doubly linked list. So I am inserting the nodes from a d-linked list into this array. Then I am trying to sort it by partitioning it. And I get the following errors:

left of '->startCount' must point to struct union
expression must have pointer-to-class type

for the following code in the while statement:

int PartitionArray(DListNode*** sortArray){
........
while((*sortArray[left]->startCount - *sortArray[left]->endCount) < (pivot->startCount - pivot->endCount)){
left++;
}
........
}

where in main I have:
int main(){
DListNode **sortArray;
PartitionArray(sortArray);
}

I don't understand how I am suppose to access the values of the nodes through the array passed by reference.

Joao · Accepted Answer · 2013-11-02 06:05:00Z

1

Depending on how you have defined your data structures, you may be dereferencing the variables the wrong way. As the * operator has a lower precedence, you may need to use

(*sortArray)[left]->startCount

or

(*sortArray[left])->startCount

or

(*sortArray)[left].startCount

or

(*sortArray[left]).startCount

instead of

*sortArray[left]->startCount

answered Nov 2, 2013 at 6:05

Joao

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2 Comments

ddwong Over a year ago

Thank you! Now I have another question: I am getting a segmentation fault when I set an element in sortArray to a pointer to a node inside the funciton: int PartitionArray(DListNode*** sortArray){ DList Node = curNode; sortArray[1] = curNode; } I get a segmentation fault.

Joao Over a year ago

It seems that sortArray may not have been initialized. I would need to see the code before calling PartitionArray() to understand how the data structures are being handled.

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