what does whitespace actually mean in programming lang.

Question

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Answer 1

Nothing.. they are useful for humans, for readability.

When you compile, first the preprocessor leave those spaces and do some other stuffs, like include sources..
#include <iostream > //is a preprocessor directive.
or define..
#define MaxValue 10000// PP substitute MaxValue with 10000

After PP steps the compiler do its stuffs.

Answer 2

its just spaces in your code

example

int i = 123;
int i =[.............ignored..........]123;

Answer 3

can you please delete the duplicates of this question?