Can someone tell me what I'm doing wrong?

[Patch97236]

My gcc compiler is screaming at me when I run this code, what am I doing wrong here? There is also a supplied.o file for the other functions.

arr.h file:

#include "arr.h"

arr.h file:
[code]
//arr.h
#include <iostream>
#include <cstring>
#include <cctype>

const int SIZE = 5;	//size of the array of head pointers

struct node
{
    int data;
    node * next;
};


/* These functions are already written and can be called to test out your code */
void build(node * head[]);  //supplied
void display(node * head[]);  //supplied
void destroy(node * head[]); //supplied

/* *****************YOUR TURN! ******************************** */
//Write your function prototype here:
int sum(node * head[]);
void removeTwo(node * head[]);

#include "arr.h"

int sum(node * head[])
{
	int total = 0;
	
	for(int i = 0; i < 5; i++)
	{
		node *temp = head[i];
		while(temp != NULL)
		{
			total += temp->data;
			temp = temp-> next;

		}
	}
	
	return total;
}


void removeTwo(node * head[])
{

	for(int i = 0; i < 5; i++)
	{	
		node *temp = head[i];
		node * prev = temp; 


		while(temp != NULL)
		{
			if(temp->data == 2)
			{
				if(temp == head[i])
				{
					prev->next = head[i]->next;
					delete temp;
					temp = prev->next;
					prev = temp;
					*head = temp;
				}
				else if(temp->next == NULL)
				{
					delete temp;
					prev->next = NULL;
				}
				else
				{
					prev->next = temp->next;
					delete temp;
					temp = prev->next;
					prev = temp;

				}
			}
			temp = temp->next;
			prev = temp;
		}
	
	}

	

}

main.cpp file:

#include <iostream>
#include "arr.h"

using namespace std;

int main()
{
    node * head[SIZE] = {0,0,0,0,0};
    build(head);
    display(head);

    //PLEASE PUT YOUR CODE HERE to call the function assigned

	int total = sum(head);
	//cout << "Sum of array of linked list is:" << endl;
	cout << total << '\n' << endl;

	removeTwo(head);
	//cout << "The array of linked list after removing two: " << endl;

    

    display(head);
    destroy(head);
    
    return 0;
}

[Peter87]

What is the error message? If it is something like "undefined reference" about the "other functions" you are probably not linking the supplied .o file correctly.

[coder777]

The if clause on line 35 in removeTwo(...) is certainly wrong.

				if(temp == head[i])
				{
					if(head[i]->next)
					{
						temp = head[i]->next;
						head[i]->next = temp->next;
						delete temp;
						temp = head[i];
					}
					else
						??? // Problem here: What to do with the content of head[i]?
				}