c - Why is the use of "declared data types" encouraged and "processor-dependent data types" discouraged? -

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i found note in software development plan:

use of declared types encouraged. use of processor dependent types such char, int, , long discouraged.

what point of statement? why use of declared types encouraged? example of declared type in context bool instead of bool.

data types int, long, etc. have size platform dependent. result 1 can discourage usage of types, platform independence...

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