FAQ: Functions: Scope & Flexibility - Default Arguments

This community-built FAQ covers the “Default Arguments” exercise from the lesson “Functions: Scope & Flexibility”.

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There’s a typo

But the following does NOT work for add_num(3); the computer assumes that 3 still corresponds to num1 :

should probably read:

But the following does NOT work for add_nums(3); the computer assumes that 3 still corresponds to num1 :

as there is no mention of add_num() anywhere else.

Why the default values should only be included on the .hpp and not the relative .cpp file too?

1 Like

I have the same doubt, have you figured it out?

Can it be specified in any of both files?


what does it mean by "remove all unnecessary false arguments?

add it to the bugs section in get unstuck I already had informed about the bug on the website

The default argument is false so there is no need to add false there.

@text3185827510 and @gerardomtz_h

Example :

// Declaration
void intro(std::string name, std::string lang = “C++”);

// Definition
void intro(std::string name, std::string lang) {
std::cout << "Hi, my name is "
<< name
<< " and I’m learning "
<< lang
<< “.\n”;

You have to ‘DECLARE’ things in declaration not in definition because you had already ‘declared’ it while declaring your function.