Examining the Compilation Process. Part 1.

“As mentioned earlier, the first step that the compiler does is
it sends our source code through the C Preprocessor. The C
Preprocessor is responsible for 3 tasks: text substitution,
stripping comments, and file inclusion. Text substitution and file
inclusion is requested in our source code using preprocessor
directives. The lines in our code that begin with the
“#” character are preprocessor directives.”

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