The functions

Functions are blocks of code that can be called several times and from multiple locations in the graph code. A function is a subroutine which, unlike a procedure, returns a value at the end of its execution. A function declares itself exactly as a procedure. - Proc Name(s) For example: - Proc Test(x) "Proc" is the keyword that always identifies a procedure or function. The "Test" label is the name of the function. The parameter "x" is the data that is passed to the function code. The parameters of a function are declared as local variables of the function. In general, the structure of a function is identical to that of a procedure, so also refer to the chapter that talks about Procedures. In order for a procedure to become a function and return a value, it is necessary to valorize the variable "result" within it. For example: - Proc Test(x) - result = x*2 - EndProc A function, because it returns a value, can be used as an expression in assignments and operations. For example: - I = Test(30) The "I" variable contains the value 60, since the "Test" function returns a value and assigns it the data "x*2", in this case "30*2". - I = Test(30)+7 In this case, the variable "I" contains the value 67 because an addition operation is carried out before the assignment. A function can be called up as a procedure. In this case, the return value is ignored. - Test(4) A function can be used as a parameter of a procedure or another function. For example: - I = Test(Test(2)) The value assigned to "i" will be 8. The "Test" function has been used as a parameter of itself. A procedure or function may recall itself in a recursive cycle, direct or indirect. Recursive cycles are monitored to avoid infinite loops. You can use recursion up to 256 times.