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Help with C++ expression

Started by penetrator Apr 4, 2005 at 5:50 PM 4 replies 1.4k views

Original Post

Apr 4, 2005 at 5:50 PM

Hi, could you please explain what the following expression does ? value = (float) X + ( ( nTri == 1 || nTri == 2 || nTri == 5 ) ? Resolution : Scale );

DigitalDelusion

Apr 4, 2005 at 5:53 PM

it does this:

value = (float)X;if( nTri == 1 || nTri == 2 || nTri == 5 )//nTri == 1, 2, or 5  value += Resolution;else  value += Scale;

why it does it otoh I have no idea :p

Evil Steve

382

Evil Steve

Apr 4, 2005 at 5:54 PM

value = (float) X + ( ( nTri == 1 || nTri == 2 || nTri == 5 ) ? Resolution : Scale );
is the same as:

if(nTri==1 || nTri==2 || nTri==5)   value = (float) X + Resolution;else   value = (float) X + Scale;

Just in a shorter form.

EDIT: Bah, beaten [smile]

bkt

Apr 4, 2005 at 10:18 PM

Inline if-statements are god.

Xipher

Apr 5, 2005 at 12:50 AM

actually, the ? : is a trinary operator, not so much an inline if statment.

Miserable

Apr 5, 2005 at 1:09 AM

The key difference between the ternary operator and an if-statement is actually what the OP implies in the topic name: It's an expression, not a statement.

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