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SimplIQ Software Manual 4BThe SimplIQ User Programming Language

MAN-SIMSW (Ver. 1.4)

5-24

y2 = y1 + y2 ;

Executable code

Return

Function end

Before a function call, the function must be declared, either as a function prototype or a

function definition.

Example 13:

function [int y1, int y2] = func (float x1, int x2;)

Function prototype

…

function main ()

Function main definition

int a, b;

Local variable definition

[a,b] = func (2.3, -9.0);

Function call

Return

Function main end

…

function [int y1, int y2] = func (float x1, int x2)

Function definition

… Function body

Return

Function end

If a function is declared without a body, its call is illegal.

Example 14:

function [int y1, int y2] = func (float x1, int x2) ;

Function prototype

…

function main ()

Function main definition

int a, b;

Local variable definition

[a,b] = func (2.3, -9.0);

Function call

Return

Function main end

…

In this example, function func has a prototype, but no body, so its call is illegal.

5.8.2 Dummy Variables

The input and output arguments of a function are called dummy variables. A true variable

is substituted for the dummy variable when a function is called.

Example:

function [float mean, float std]=statistic();

In this function, variables mean and std are dummy variables (full example in section

5.8.3).

5.8.3 Count of Output Variables

A function may return multiple values, although in certain cases, not all outputs need be

computed. The nargout keyword can therefore be used to indicate which of the results

actually need to be evaluated.

The number of outputs is the number of items in the left side of the expression during the

function call. If this number exceeds the maximum number of defined output arguments for

the function, or the maximum admissible number of output arguments, an error will be

declared.