General Function Form
in general,
the form of a user-defined function is as follows:
nfunction names follow the same rules as variables:
consist of letters, digits, and underscores
and must start with a letter
nnote that there may be:
pmore than one parameter, separated by commas
pno parameters at all, in which case the function name is
followed by ()
pmore than one statement inside the curly braces
,separated by semicolons
function
FUNCTION_NAME(PARAMETER_1, PARAMETER_2,..., PARAMETER_n)
// Assumes:
DESCRIPTION OF ASSUMPTIONS MADE ABOUT PARAMETERS
// Returns:
DESCRIPTION OF VALUE RETURNED BY FUNCTION
{
STATEMENTS_TO_PERFORM_(AND_RETURN)_THE
DESIRED_COMPUTATION;
}
function difference(num1,
num2)
// Assumes: num1 and num2
are numbers
// Returns: the difference
between num1 and num2
{
return (num1 – num2);
}