i have to write main function to test my project \" SIMPLES_GRADES\" and i use X

Question

i have to write main function to test my project " SIMPLES_GRADES" and i use Xcode 6.2

here is my main.cc

#include <iostream>

#include "p0.h"

using namespace std;

int main()

{

SIMPLEST_GRADES g;

g.SIMPLEST_READ();

g.SIMPLEST_AVE(2);

return 0;

}

here is my header file

#ifndef p0_p0_h

#define p0_p0_h

#include <stdio.h>

class SIMPLEST_GRADES

{

public:

SIMPLEST_GRADES(void);

void SIMPLEST_READ(void);

void SIMPLEST_AVE(int);

private:

int n;

int id[20];

int e1_grades[20];

int e2_grades[20];

int e3_grades[20];

float average;

};

#endif

Here is the error massage:

Undefined symbols for architecture x86_64:

"SIMPLEST_GRADES::SIMPLEST_AVE(int)", referenced from:

_main in main.o

"SIMPLEST_GRADES::SIMPLEST_READ()", referenced from:

_main in main.o

"SIMPLEST_GRADES::SIMPLEST_GRADES()", referenced from:

_main in main.o

ld: symbol(s) not found for architecture x86_64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

Explanation / Answer

Yes, we will get warnings like .. undefined reference to SIMPLEST_AVE(int) etc..

because .. we are using header file here .. but in this header file we are trying to build class methods ..

But c++ wont accept ... we must define in in another .cpp format to overload the methods.

Second one: we declared function prototypes, but function implementations are missing.

Third one: This include statement fails "#ifndef p0_p0_h"

Fourth one: When writing methods .. we must "::" operator.

ex:  void SIMPLEST_GRADES::SIMPLEST_AVE(int num) { }

You not declared in this format, so it was giving error .. undefined reference error ..

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