C++ strigs

Question

how string comparisons work in C++ for example:std::cout<<("Annie">"Andy");
why this gives 0 when i executed my program

Answer 1

Can't compare that way now.
You should understand that "Annie" and "Andy" are constant char literal in memory, those are not string (as in std::string).

If you want to compare constant char literals, then go with strcmp() from <cstring> which handles C-String including such constant char literals.

http://www.cplusplus.com/reference/cstring/strcmp/

On the other hand, if those two were actual std::string objects, then you can do comparison by using comparison operators (before C++20),

https://en.cppreference.com/w/cpp/string/basic_string/operator_cmp

Or, if you rather want the comparison to calculate such a value usable by sorting algorithms, you can use std::string::compare() function.

https://en.cppreference.com/w/cpp/string/basic_string/compare

Answer 2

That wrote number because you ddin't set the flag std::boolalpha. If it's true the program will write a boolean as "true" or "false", if its not it will write a number.

Answer 3

i didn't understand at all. can you explain me basically

Answer 4

Set flag like this:

Std::boolalpha=false;
So then

Cout << true <<endl;

Will write 1 in console

If you set it like

Std::boolalpha = true;
That will write exactly "true" in console, got it?