Help with pragma and #define

[steady vault]

I dont quite understand both if these so can anyone explain what are they and what they do

[prime steppe]

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[hollow topaz]

https://en.cppreference.com/w/cpp/preprocessor/replace.html
https://en.cppreference.com/w/cpp/preprocessor/impl

are you talking about pragma once vs header guards?

[honest valley]

pragma once makes it so that

compiler won't open and read the file again after the first #include of the file in the translation unit

Look up examples of it being used and it could help you learn it

[ornate loom]

Define is simply a macro directive meaning whatever you define will be substituted into wherever in your source code you declare that definition. All before compilation

[steady vault]

So its kinda like a func?

[ornate loom]

you can define macros that REPRESENT functions yes but they themselves are not functions think of it sort of like a search and replace tool

[steady vault]

Oh alr thx

!solved