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Lesson 1















Automated Internet

Automated Editors

Sample Scripts

Precompiled Functions

System Features

  Help Page - return

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Command return Purpose Returns (optionally, a value) from a function. Aliases return, ret, rtn Syntax return [<return_value>] Options None. Arguments <return_value> A value of the same type as the function type. See the help page for fun. If the function is declared as type 'null', this argument should not be specified. This argument can be specified using either a constant, variable, function call (to another function), inline command, or an expression consisting of any of these. In all cases, the argument must result in a value of the same type as the function type. Stream Input Ignored. Stream Output None. Stream Error Any errors are written here. Description function...end is a programming construct that allows to separate a certain functionality into a separate part of the code. This makes the code more manageable. A function often returns a value, and the return command is used for that purpose. If, in the flow of execution of a function, the end command is encountered before encountering a return command, the default value of of the same type as the function type, will be returned. For example, an integer function, that has no return command, will return 0. There is often a need to write functions that return no value. These functions perform some actions, but don't return a value to the caller. The purpose of these functions is just to sepearate a functionality. The type of 'null' should be used for these functions. Similarly, there are functions that provide output to the user, but return no value to the caller. These functions are also declared to be of type 'null'. See the example function EvenOdd2 below. Restrictions Redirection is not allowed on function, return and end commands. If redirection is specified, it will be ignored. However, commands within the function can have their individual redirections. Valid Examples function integer square # This function calculates the square of the number # passed as variable $num. var int num var int sqr set $sqr = $num*$num return $sqr end The above function calculates the square of an integer number. Once declared, this function can now be called with the following command. echo square(num(5)) The above command will print the square of 5. The function can now be called in this manner in any place where an integer value is required (beacause the function's type is integer). The return command in the above function can also be written using an expression, as follows. return ($num*$num) Here is a function that determines if an integer number is an even number or an odd number. function string EvenOdd var int num if ( (($num/2)*2) == $num ) return "even" else return "odd" endif end This function can now be called as echo EvenOdd(num(5)) The above command will print "odd". If we want to write the output directly to the user and not return any value to the caller, the above function can be written as follows. function null EvenOdd2 var int num if ( (($num/2)*2) == $num ) echo $num " is even" else echo $num " is odd" endif end This function can now be called as follows. var integer i while ($i <= 10) do echo EvenOdd2(num($i)) set $i = $i + 1 done Invalid Examples Consider the following function. function string EvenOdd3 var int num if ( (($num/2)*2) == $num ) return 0 else return 1 endif end When this function is called, an error is produced. This is because, the function's type is string, and the return command is returning a value of type integer. Now, consider the following function. function integer square2 var int num var int sqr set $sqr = $num*$num end When this function is called, it will return 0. This is beacuse, there is no return command in the function. So when the function ends (with the end command), the default value of type integer will be returned, which is 0. See Also fun script exit break continue

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