To add to what Mircea said, function definitions (implementations) usually go in a .cpp for two reasons:
By default, a header is recompiled each time that a .cpp#includes it, so defining large functions in headers can really slow down a compile. Some compilers optimize this, but it isn't guaranteed.
A header should be an interface, with implementation details going in a .cpp rather than cluttering the header.
However, there are two situations when function definitions go in a header:
If a function is simple, usually just a single line, it's expedient to just define it in the header.
A function template, or a function in a class template, is defined in a header.
As far as where to define functions is concerned, I prefer to define each class in its own header (Class.h) and implement its functions in Class.cpp. This isn't mandatory, because the .h and .cpp are not compiled into a single binary. Each .cpp, along with all the headers that it #includes, is compiled into its own binary, after which the linker merges them all.
Some C++ gurus say there is no rationale for putting each class in its own .h and .cpp. They're wrong, but there are exceptions:
A "helper" class (used only to implement another one) can be defined in the same .cpp as the only class that uses it.
Small, related classes can be defined in a common .h and implemented in a common .cpp.
However, each important class gets its own .h and .cpp. This makes code easy to find, even outside the IDE. Besides, anything else is arbitrary; no one would suggest that one big .cpp is good for a project with 10,000+ lines of code. Some kind of organization is needed, and the approach that I've described is the obvious one.
you are a tax calculator in company, and you should calculate the tax based on staff’s salary as follows:
-the salary is less than 600, the tax is0.
-the salary is greater than 600 and less than 800, the tax is 10% of the salary.
-the salary is greater than 800 and less than 1000, the tax is 13% of the salary.
-the salary is greater than 1000 and less than 1500, the tax is 18% of the salary.
-the salary is greater than 1500, tax is 20% of the salary.
Write a program in C++ to ask the user to enter the salary then calculate the tax using:
If-Only structure, If-Else structure, Switch-Case structure.
cout<< "Tax software developed by https://iq.direct" << endl;
cout<< "Enter Salary:";
double s = 0, t = 0;
cin >> s;
cout<<"you entered: " << s << endl;
if (s < 600)
t = 0;
if (s >= 600 && s < 800 )
t = s * 0.1;
if (s >= 800 && s < 1000 )
t = s * 0.13;
cout<< "The tax will be :" << t;
I could not test your "code" because there is a lot of problems with:
cannot convert from 'DWORD (__cdecl *)(DWORD_PTR,LPBYTE,LONG,LONG *)' to 'EDITSTREAMCALLBACK'
and so on.
Could you post a code (sample project) that would reproduce your problem?
You have to simplify your project code until it will reproduce the problem. Just make a very simple project with your RichEdit without any TCP/IP and other IPCs.
Test it. If you won't find the reason of the trouble while debugging this test project then post it to me or/and to the community.
For the class parameter the documentation says a redefined name (not sure what that means) the reason I am asking I am using a control for which I have a specific WNDCLASS which I registered however the CDialog::Create fails with that control statement in the resource definition
Last Visit: 31-Dec-99 18:00 Last Update: 22-Sep-23 19:35