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Conditional Expression Operator ?: error

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rhaguiuda

Joined: 05 Sep 2007
Posts: 46
Location: Londrina - Brazil

Conditional Expression Operator ?: error

Posted: Fri Jul 25, 2008 8:50 am

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I can't understand why this code generates an error:

Code:

(input(PIN_A1)) ? i = 1 : i = 0;

Error: Line 214(23,24): Expecting :

My compiler version is: 4.017

Can someone help me?
Thanks!!!

ckielstra

Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

Posted: Fri Jul 25, 2008 9:24 am

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You syntax is wrong, it should be:

Code:

i = (input(PIN_A1)) ? 1 : 0;

Several companies I've worked for don't allow the ?: construction because it often leads to difficult to read code and does not reduce the size of the generated code. The following code fragment does the same and is easier to read:

Code:

if (input(PIN_A1))
i = 1;
else
i = 0;

or in this particular case can even be optimized to:

Code:

i = input(PIN_A1);

As a side note: the compiler versions before v4.030 contain large numbers of bugs and I wouldn't use them.

rhaguiuda

Joined: 05 Sep 2007
Posts: 46
Location: Londrina - Brazil


Posted: Fri Jul 25, 2008 11:04 am

Ckielstra, thanks very much. The code works great now!

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