CODEWITHSUNDEEP
c++
user3573388
user3573388

Reputation: 191

C++ conditions inside return statement

Is there a way to do this

bool retA = true, retB=false retC=true,retD=false;

return ( (if RetA -> A) + (if RetB -> B) + (if RetC -> C) + (if RetD -> A) )

Basically if {A,B,C,D] = {1,2,3,4}, return value is 1+0+3+0 = 4. You can do this with 16 different if/else statements, but the code is not pretty.

Upvotes: 2

Views: 155

Answers (1)

T.J. Crowder
T.J. Crowder

Reputation: 1074335

I think you're looking for the conditional operator, which looks like this:
testExpression ? trueExpression : falseExpression.

So:

return (retA ? A : 0) + (retB ? B : 0) + (retC ? C : 0) + (retD ? D : 0);

All of the languages syntactically derived from B have the conditional operator (C, C++, Java, JavaScript, and several others).

Side note: You were using A after the RetD condition, but I figure you meant D. Also, no need for the outer pair of (), so I left them off.

You'll sometimes hear the conditional operator called "the ternary operator," which is fine but isn't quite correct: It's a ternary operator (that is, an operator that accepts three operands) just like * is a binary operator (an operator that accepts two operands). As far as I know, the conditional is C++'s only ternary operator, but in theory someday there could be more...

Upvotes: 8

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