Different way to define input parameter with an array

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Alessio Merlo asked Feb 26, '20 Alessio Merlo commented Feb 27, '20

Different way to define input parameter with an array

Hi,

I am sure to be stupid, but I don't find the error in my usercommand.

I attached a model where:

1. I create a usercommand which prints input parameter;

2. I execute the usercommand in a script console defining in different way the input parameter;

3. the command results in output console are foolish!

Where is my error? Help me!

compiler-issue.fsm

Software Version:

FlexSim 20.0.2

usercommand compiler

compiler-issue.fsm (23.3 KiB)

Answer 1 · 2020-02-26T18:09:02Z

Matthew Gillespie answered Feb 26, '20 Alessio Merlo commented Feb 27, '20

If you just pass in just the values of cnt++ and cnt2++, you'll see what's going on:

print("First Execution");
command1(1,2);

print("Second Execution");
int cnt = 1;
command1(cnt++,cnt++);

print("Third Execution");
int cnt2 = 0;
command1(cnt2++,cnt2++);

This produces the following output:

First Execution
param1:= 1
param2:= 2
Second Execution
param1:= 2
param2:= 1
Third Execution
param1:= 1
param2:= 0

Notice that cnt++ and cnt2++ are being evaluated from back to front.

You shouldn't depend on the order that the cnt++ expressions are being evaluated. We don't guarantee that they'll be the same between 64 and 32 bit, or that they'll even ever be evaluated in a certain order.

· 1

Alessio Merlo commented · Feb 27, 2020 at 08:09 AM

Thanks @Matthew Gillespie! I will keep in mind next time!

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