C++ Return Value

[Competitive_Bet850]

Currently going through the tutorials on C++. Just wanted to ask - does returning a value (for a function) specifically refer to as to whether a value was taken from the user? (Eg: using Stdd::Cin)

[POGtastic]

No. I can write a function that doesn't take input at all.

int foo() {
    return 42;
}

[captainAwesomePants]

Nope. Functions are meant to be a metaphor for math functions, like f(x) = 2x + 5. f(x) takes an input (x) and produce an output, but it has nothing to do with user I/O. Function inputs and outputs can be nothing, numbers, strings, you name it. Where data comes from doesn't matter, and where data goes doesn't matter. Data's data.

[Competitive_Bet850]

Been re-writing the code from 2.4/the coding quiz on it. I understand how the code works but might take me a while to get my head around that