include
.
This include command tells the
preprocessor that we need information from selected libraries known as header files. By the
time we type our C program (in some editors), all the preprocessor allocations will have taken
place automatically.
This means that the preprocessor actually analyzes these statements before
the analysis of the C program itself takes place
.
Preprocessor statements are identified by the presence of a pound sign, #, which must be the first
nonspace character on the line.
In C, a programmer inserts a directive
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