Keep main( ) small and readable by writing functions that are either modules
or are for hiding details. main() should be a skeleton of the program
Write modules whenever possible.
Do not allow functions that are modules to be dependent upon #defines.
Pass values to these functions rather than using symbolic constant names
within the function's code. This makes a function more general and promotes
See the changes made to GetRandomNumber( ) as an example.
GetRandomNumber() in the Cards example below has the necessary values
passed in as arguments and is now independent code (GOOD), which is essential
for it to be a module.
Remove any large section of code that accomplishes one purpose from main(
) and place it in an appropriately-named function for hiding details.
Replace any numbers (constants) that "magically appear" in main( ) and
in any "hiding-details" functions with symbolic constants (meaningfully named
#defines) for readability.
number" is the disparaging terms used by computer programmers
for "a special constant used for some specific purpose". It's
magic because its value or presence is inexplicable without some