c++ Class Header - "error: expected unqualified-id before ')' token" [closed] - c++

Question

Closed. This question needs debugging details. It is not currently accepting answers.
Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
Closed 8 years ago.
Improve this question
I must be overlooking something simple but I have so much to do in so little time that I might just be overworked. Anyway, here's where I'm getting the error.
#include<iostream>
#include<algorithm>
#ifndef Numbers
#define Numbers
class Numbers{
public:
Numbers(){capacity=5; used=0; data = new unsigned long[capacity];}
It's simply a constructor for the class Numbers. The private area of the class is as follows.
private:
unsigned long *data;
std::size_t used;
std::size_t capacity;
};
Again, it's probably something simple that I just can't see and I'm sure others run into the problem as well.
EDIT: error is as follows
numbers.h:9:11: error: expected unqualified-id before ')' token
Numbers(){capacity=5; used=0; data = new unsigned long[capacity];}
^

Answer 1

Run through the preprocessor, this:
#ifndef Numbers
#define Numbers
class Numbers{
public:
Numbers(){capacity=5; used=0; data = new unsigned long[capacity];}
becomes this :
class {
public:
() {capacity=5; used=0; data = new unsigned long[capacity];}
Your class name is the same as your include-guard fencepost macro. Since Numbers will be replaced with.. nothing.. you get no class name, nor constructor name. Don't do that.
Try:
#ifndef MYAPP_NUMBERS_H
#define MYAPP_NUMBERS_H
#include <iostream>
#include <algorithm>
class Numbers
{
public:
Numbers()
{
capacity=5;
used=0;
data = new unsigned long[capacity];
}
...etc...