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+---- Thread: Problem with a member function of a class (/showthread.php?tid=2330)
Problem with a member function of a class - charnet3d - 10-29-2009
Hi everybody,
I have been assigned a homework in C++, in which I have to create a class vector3d. Here's my code:
Code:
#include <iostream>
#include <math.h>
using namespace std;
class vector3d
{
float x;
float y;
float z;
public:
inline vector3d(float x = 0, float y = 0, float z = 0)
{
this->x = x;
this->y = y;
this->z = z;
}
vector3d& operator=(const vector3d& v)
{
x = v.x;
y = v.y;
z = v.z;
}
float norm() const
{
return sqrt(pow(x, 2) + pow(y, 2) + pow(z, 2));
}
void norm_compare(const vector3d & v, vector3d * r)
{
if (this->norm() > v.norm)
*r = *this;
else
*r = v;
}
void print() const
{
cout << "x:" << x << endl;
cout << "y:" << y << endl;
cout << "z:" << z << endl;
}
};
int main()
{
vector3d v;
vector3d v2(2, 5);
vector3d v3;
v2.norm_compare(v, &v3);
v3.print();
return 0;
}I don't know what's wrong with it, it gives me the error "invalid use of member (did you forget the `&' ?)" in the first line "if (this->norm() > v.norm())" inside the member function norm_compare.
When I take away "v.norm" and replace it with a 0 it doesn't give the error, I don't understand, because that's supposed to work!
Thanks in advance for your help ^^
RE: Problem with a member function of a class - Gaijin - 10-29-2009
Well "norm" is a function and you forgot "()".
Code:
if (this->norm() > v.norm)
// TO
if (this->norm() > v.norm())That complied on my pc with dev-c++.
RE: Problem with a member function of a class - charnet3d - 10-31-2009
ohhh what a mistake!!
Such subtleties make you go crazy, and the compiler notifies you about something far bigger hehe
Really thank very much, that saved me a lot of pain ^^