c - what is difference between these two library and processsor directives? -


what difference in working of these 2 directives?

#include<stdio.h>

and 

#define pi 3.14

please explain difference between these library , processor directives?

the first 1 tells compiler include header file. second 1 defines constant "pi" replaced everywhere in code "3.14" preprocessor.

read more #define here

read more #include here

you should try , homework yourself.


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