Teledyne LeCroy LeCroy Analyzers File Based Decoding Manual - Manual (Page 37)

File-based Decoding User Manual Chapter 10: Functions
LeCroy Corporation
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Chapter 10: Functions
A function is a named statement or a group of statements that are executed as one unit.
All functions have names. Function names must contain only alphanumeric characters
and the underscore (
_ ) character, and they cannot begin with a number.
A function can have zero or more parameters, which are values that are passed to the
function statement(s). Parameters are also known as arguments. Value types are not
specified for the arguments or return values. Named arguments are local to the function
body, and functions can be called recursively.
The syntax for a function declaration is
name(<parameter1>, <parameter2>, ...)
{
<statements>
}
The syntax to call a function is
name(<parameter1>, <parameter2>, ...)
So, for example, a function named add can be declared like this:
add(x, y)
{
return x + y;
}
and called this way:
add(5, 6);
This would result in a return value of 11.
Every function returns a value. The return value is usually specified using a return
statement, but if no return statement is specified, the return value is the value of the
last statement executed.
Arguments are not checked for appropriate value types or number of arguments when a
function is called. If a function is called with fewer arguments than were defined, the
specified arguments are assigned, and the remaining arguments are assigned to null. If
a function is called with more arguments than were defined, the extra arguments are
ignored. For example, if the function add is called with just one argument
add(1);
the parameter x is assigned to 1, and the parameter y is assigned to null, resulting in a
return value of 1. But if add is called with more than two arguments
add(1, 2, 3);
x
is assigned to 1, y to 2, and 3 is ignored, resulting in a return value of 3.