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What is this?

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What is this? C programming forum discussing all C derivatives, including C#, C++, Object-C, and even plain old vanilla C. These languages are low level languages, and used on projects such as device drivers, compilers, and even whole computer operating systems.

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  #1  
Old October 11th, 2002, 10:38 AM
Houdini Houdini is offline
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Question What is this?
Where can I find documentation for the folllowing code. I know all about argv and argc. What is the "(x) ? x : x" part?

(i < argc-1) ? " " : ""

I've also seen integers used in place the chars as well.

Anyone?
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Old October 11th, 2002, 10:58 AM
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It's a conditional expression.

expr1 ? expr2 : expr3

expression expr1 is evaluated first. If it's true then expr2 is evaluated and if it's not then expr3 is evaluated.
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Old October 11th, 2002, 11:12 AM
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Ahhhh.
So its short hand for an if..else basically.
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Old October 11th, 2002, 01:15 PM
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Well, sort of. But an if-else construct is a statement, whereas the ternary ?: operator results in an expression. Example:

a = (x < y) ? x : y;

So yes, it's like an if-else statement in the sense that there's a conditional expression involved, but that's about it.
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