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Wont Let Me Divide By Sum Made By Arrays

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2 replies to this topic

#1 HelpMePlz

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Posted 26 April 2012 - 11:53 AM

I have a total which I have arrived at by using the following codes:

For j := 0 to 100 do begin
                                  temp3 := (UsersShares[j] * Week1SharePrices[j]);
                                  PortWorthWeek1 := PortWorthWeek1 + temp3;
                                  end;  

For some reason lazarus won't let me divide something by PortWorthWeek1.

Any ideas why? It's not a problem with the division or anything as it works with everything else but for some reason it wont let me divide anything bythis number.

This is the code I am using to try and divide using PortWorthWeek1

PortPerChange := (((PortWorth - PortWorthWeek1) * 100) / PortWorth);

But the program crashes when it trys to run this piece of code.

Thanks for the help!

The funny thing is that it works for pretty much the exact same code when used with arrays:

PercentageChange := (((SharePrices[j] - Week1SharePrices[j]) * 100) / SharePrices[j]);

That runs just fine.
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#2 WingedPanther73

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Posted 26 April 2012 - 02:56 PM

Where are your declarations? It's almost impossible to know what's going on with so little code.

Also, are you getting a compile-time or run-time error?

Finally, where do you set PortWorth? It will default to 0, a no-no for dividing.
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#3 Luthfi

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Posted 26 April 2012 - 07:26 PM

In this case, it's helpful to know that types were the involved variables. Every types, especially numeric, has range limitation that your code might had violated. Please post their declarations.

Anyway, you can try to analyze the problem by placing breakpoint on this line:
PortPerChange := (((PortWorth - PortWorthWeek1) * 100) / PortWorth);

then run the program. When the program is paused on the breakpoint, you can check the value of each variable then find out if the math calculation is okay (no divide by zero) or possibility of range violation.
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