Always initialize counters and totals.

Declare each variable on a separate line.

Unary operators should be placed next to their operands with no intervening spaces.

Control counting loops with integer values.

Indent the statement in the body of each control structure.

The keystroke combinations for entering end-of-file are system dependent. i.e. Ctrl + D for Linux and Ctrl + Z for Windows.

Testing for the symbolic constant EOF rather than -1 makes programs more portable. The ANSI standard states that EOF is a negative integer value (but not necessarily -1). Thus EOF could have different values on different systems.

Because ints vary in size between systems use long integers if you expect to process integers outside the range -32768 to +32767 and you would like to be able to run the program on        several different computer systems.

For compatibility with earlier versions of C++ standard, the bool value true can also be represented by any non-zero value and the bool value false can also be represented as the value 0.