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? and : in C programming

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feiutm9898

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Hi.

What is the meaning of "?" and ":" in C programming.

Hope can get your comment.

-----------------------------------------------------------------

Job[ id ].Flag.process= ( Option & Mask ) ? 1 : 0;

-----------------------------------------------------------------
 

Hi,
It is the short form of if else condition. that is -

if(Option & Mask){
Job[ id ].Flag.process=1;
}
else{
Job[ id ].Flag.process=0;
}
 

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    feiutm9898

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if true, use the first one. if false, use the second one.

If you don't understand or aren't comfortable in using it, then use if else statements. Anything that makes your code readable is good. Writing a compact code aren't necessary good, especially in the long run.
 

The Conditional Operator:

?:
Click to expand...

General Comments:

This operator takes three operands, each of which is an expression. They are arranged as follows:

expression1 ? expression2 : expression3
Click to expand...

The value of the whole expression equals the value of expression2 if expression1 is true. Otherwise, it equals the value of expression3.

Examples:

(5 > 3) ? 1 : 2 has the value 1.

(3 > 5) ? 1 : 2 has the value 2.

(a > b) ? a : b has the value of the larger of a or b.
Click to expand...
 

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    feiutm9898

    Points: 2
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slavako explained it in a very right manner!

simply you can replace the two by if and else if exp 1 is true the is equivalent to exp2 else its equal to exp3.
 

Search for conditional expression in the C bible (aka Kerningham and ritchie) and you will find the answer by yourself and learn more!!!
 

This is a handy construct for a conditional return statement.
for example,

return (A == B) ? True : False;

is neater then

if(A == B)
return True;
else
return False;
 

Even better, if True is 1 and False is 0, then:
return A == B;
is neater than:
return (A == B) ? True : False;
 

This is also called as ternary operator.
 

Nice one echo47, but it was just an example.
You can of course also nest them.
 

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