http://kor.i2p/books/The%20C%20Programming%20Language%20by%20K&R/chapter2.html
We tend to
use short names for local variables, especially loop indices, and longer names
for external variables. 2.2 Data Types and Sizes There are only a few basic data types in C: char a single byte, capable of holding one character in the local character set int an integer, typically reflecting the natural size of integers on the host machine float single-precision floating point double double-precision floating point In addition, there are a number of qualifiers that can be applied to...