linked list errors

[ironeagle]

I have a program that creates a linked list and is required to count the number of elements in the list. This is what I have thus far.

// code snipped per FAQ and Posting Guidelines
struct listrec* temp; 
 
int main() 
{ 
int sum = 0; 
cout << "The list size is " << listsize(*temp); 
 
 
} 
 
 
int listsize(listrec *p) 
{ 
struct listrec* temp = p; 
int num=0; 
do{ 
temp = temp -> next; 
num++; 
}while(temp!= NULL); 
return num; 
 
 
} 
 

I get the following error on compilation.

Linker error] undefined reference to `listsize(listrec)'

Please advise.

[sicarie]

I have a program that creates a linked list and is required to count the number of elements in the list. This is what I have thus far.

// code snipped per FAQ and Posting Guidelines
struct listrec* temp; 
 
int main() 
{ 
int sum = 0; 
cout << "The list size is " << listsize(*temp); 
 
 
} 
 
 
int listsize(listrec *p) 
{ 
struct listrec* temp = p; 
int num=0; 
do{ 
temp = temp -> next; 
num++; 
}while(temp!= NULL); 
return num; 
 
 
} 
 

I get the following error on compilation.

Linker error] undefined reference to `listsize(listrec)'

Please advise.

Try moving the declaration for struct listrec* temp inside main

[ironeagle]

Try moving the declaration for struct listrec* temp inside main

I did have it in there, but I moved it to the top now and I get the following error:
35 D: cannot convert `listrec' to `listrec*' in initialization

int main()
{ struct listrec* temp;

e1.value = 4;
e1.next = &e2;
e2.value = 5;
e2.next = &e3;
e3.value = 3;
e3.next = NULL;

int sum = listsize(*temp);

cout << "The list size is " << sum;

system("pause");
return 0;
}

[ironeagle]

I think I have been going at this all wrong. Let me state the rquirements:
Write a function called listsize that takes a pointer to start of linked list and returns number of elements.
Write a main to create linked list of 4,5,3 as value1,value2,value3 and the call the function to calculate the size and print it.
Here is what I have:
#include <iostream>
using namespace std;
struct listrec
{
int value;
struct listrec *next;
};


int listsize(int);
struct listrec *p;
int main()
{
struct listrec e1,e2,e3;
e1.value = 4;
e1.next = &e2;
e2.value = 5;
e2.next = &e3;
e3.value = 3;
e3.next = NULL;
int x =0;

int sum = listsize(&x);

cout << "The list size is " << sum;

system("pause");
return 0;
}
int listsize(int &x)
{

int num=0;

while(*p!= NULL);
{
*p = *p -> next;
num++;

}
return num;
}

new error:
26 D: invalid conversion from `int*' to `int'
D: In function `int listsize(int&)':
39 no match for 'operator!=' in '*p != 0'

[svlsr2000]

I think I have been going at this all wrong. Let me state the rquirements:
Write a function called listsize that takes a pointer to start of linked list and returns number of elements.
Write a main to create linked list of 4,5,3 as value1,value2,value3 and the call the function to calculate the size and print it.
Here is what I have:
#include <iostream>
using namespace std;
struct listrec
{
int value;
struct listrec *next;
};


int listsize(int);
struct listrec *p;
int main()
{
struct listrec e1,e2,e3;
e1.value = 4;
e1.next = &e2;
e2.value = 5;
e2.next = &e3;
e3.value = 3;
e3.next = NULL;
int x =0;

int sum = listsize(&x);

cout << "The list size is " << sum;

system("pause");
return 0;
}
int listsize(int &x)
{

int num=0;

while(*p!= NULL);
{
*p = *p -> next;
num++;

}
return num;
}

new error:
26 D: invalid conversion from `int*' to `int'
D: In function `int listsize(int&)':
39 no match for 'operator!=' in '*p != 0'

declaration int listsize(int); is not same as int listsize(int &);, you have listsize as int listsize(int); and defined it as int listsize(int&);