Header-Handling C++ - not the expected Output! Handling 3 Files ... [SOLVED]

Question

Hi there!

Got 3 files:

TestClass.h
TestClass.cpp
CallingTestClass.cpp

TestClass.h: sample Class declared in this Header-file.

#ifndef TESTCLASS_H
#define TESTCLASS_H
#include <string>
using namespace std;
class TestClass{
public:
TestClass(){}
string aString;
int aInt;
void setSum(int a);
private:
void privateMethod();
int privateSum;

};
#endif

TestClass.cpp: defining the methods and so on in the sourcefile

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

TestClass::TestClass()
{
aString = "Hi there!";
};

void TestClass::setSum(int a ){
privateSum = a;
};

CallingTestClass: creating a obj of the TestClass (Constructor is called and sets the string var to "Hi there!" - then Output this string ... but nothing appears! Seems like the defined constructor of TestClass.cpp isnt called! MS does it the same way, by defining a sample method ... https://docs.microsoft.com/en-us/cpp/cpp/header-files-cpp?view=vs-2019

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

using namespace std;

int main(int argc, char* argv[]){

TestClass* objOne = new TestClass();

cout << objOne->aString;

return 0;
}

Answer 1

Edited the Tasks.JSON of VSCode to search for multiple *.cpp files in Dir to compile.
And after that was doing it the right way, i tried the way u mentioned - via terminal with g++ TestClass.cpp CallingTestClass.cpp -o CallingTestClass

Thanks for help!

Ps.: to include it like:
#include "TestClass.cpp" is probably very uncommon, isnt it?!

Answer 2

Okay - did it as u say!
Removed the {} behind the constructor-declaration, that was false, of course.

Now - if i want to run the project - it cant compile. Before, it did.

When i add: #include"Testclass.cpp" to the CallingTestClass-File - everthing works.
But why, isnt that handled the same way by MS, if u check the link?

I thought the header implements the declaration, the sourcefile implements the definition and then i include the header-file ... ?!

Answer 3

On Linux using MS Visual Code and GCC (g++).