class Grades
{
public:

// function to prompt for 10 grades using while loop
void getGrade()
{
int total = 0;
int grade;
int counter = 1;
int average = total / 10;

while ( counter <= 10 )
{
cout <> grade;
if (( grade 100 ))
cout << "Invalid scoren";
else
{
total += grade;
counter++;
}
}

cout << "nThe average grade is: " << total / 10 << "n";
}
}; // end class

#include
#include “grades.h”
using namespace std;

int main()
{
Grades myGrades; // create an object of class Grades
myGrades.getGrade(); // call the member function of object myGrades
system(“pause”);
return 0;
}
here I tried to link grades.h header files but shows link error so,i copied header file to include directory in dev cpp .then it worked,but it looks so weird, how to link without coping header file to include directory

public:
int add(int ,int );

}
int algebra::add(int a,int b)
{
return (a+b);
}

#include
#ifndef “algehra.h”
#include “algebra.h”
using namespace std;
int main()
{
int a,b;
cin>>a>>b;
algebra aa;

cout<<"addtioon=";
aa.add(a,b);
system("pause");
return 0;
}
#endif

I’m getting this error

Compiler: Default compiler
Building Makefile: “C:\Dev-Cpp\Makefile.win”
Executing make…
make.exe -f “C:\Dev-Cpp\Makefile.win” all
g++.exe -c ADD.cpp -o ADD.o -I”C:/Dev-Cpp/lib/gcc/mingw32/3.4.2/include” -I”C:/Dev-Cpp/include/c++/3.4.2/backward” -I”C:/Dev-Cpp/include/c++/3.4.2/mingw32″ -I”C:/Dev-Cpp/include/c++/3.4.2″ -I”C:/Dev-Cpp/include”

g++.exe main.o ADD.o -o “Project1.exe” -L”C:/Dev-Cpp/lib”

ADD.o(.text+0×100):ADD.cpp: multiple definition of `add(int, int)’
main.o(.text+0×100):main.cpp: first defined here
collect2: ld returned 1 exit status

make.exe: *** [Project1.exe] Error 1

Execution terminated

I’m using bloodshed

I’m learning c++ and having tough time compiling the following code. Can some please help?

This is the error i’m getting –

$ c++ main.cpp
/tmp/ccKDQaIR.o(.text+0×128): In function `main’:
: undefined reference to `add(int, int)’
collect2: ld returned 1 exit status

This is my code –

main.cpp

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

int main() {
        std::cout << "Sum of 3 and 4 is : " << add(3,4) << std::endl;
}

add.h

#ifndef GUARD_add_h
#define GUARD_add_h

int add(int, int);

#endif

add.cpp

#include "add.h"

int add(int a, int b) {
        return (a + b);
}

This is the version of my c++ compiler –
gcc version 3.4.6 20060404 (Red Hat 3.4.6-9)

Thanks!

First off you don’t need add.cpp, because add.h is your”library for the function”
-If you are following along with the tutorial you need to edit the add.h file.
-It needs to be as follows:

#ifndef ADD_H
     #define ADD_H

     int add(int x, int y) // function prototype for add.h
     {
        return x + y;  // without this the function doesn't know what you want it to do
     }

      #endif

Reason for the change…a function must be declared in order to work.

int add(int x, int y);