Associativity from right to left in ternary operator

This is a discussion on Associativity from right to left in ternary operator within the C++ Programming forums, part of the General Programming Boards category; hi, i am little bit confusion regarding the Associativity from right to left in ternary operator. Associativity comes to picture ...

  1. #1
    kotin
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    Associativity from right to left in ternary operator

    hi,

    i am little bit confusion regarding the Associativity from right to left in ternary operator.

    Associativity comes to picture when Operators on the same line in the chart have the same precedence.
    ex
    z=a+b+c+d+e; then according to associativity it start from left to right.

    same way can u give one example for right to left of tenrary operator if the operands have same precedence?

    i look for your further replys

  2. #2
    Registered User slingerland3g's Avatar
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    Tertiary operation is defined as such

    (condition) ? <if true do this> : <if false do this>


    The basis of performing either the left side of the ':' or the right side operation is all governed by the condition being either true, chose left, or false, chose right.

    That make since?

  3. #3
    Registered User
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    It means stuff like this:
    Code:
     a? b: c? d: e
    Is the same as this:
    Code:
    (a?b:(c?d:e)
    Instead of this:
    Code:
    ((a?b:c)?d:e)
    It's executed from left to right. A first. Then b or c. Then if C was executed, then d or e.
    Last edited by King Mir; 12-11-2009 at 12:13 PM.
    It is too clear and so it is hard to see.
    A dunce once searched for fire with a lighted lantern.
    Had he known what fire was,
    He could have cooked his rice much sooner.

  4. #4
    Captain Crash brewbuck's Avatar
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    The associativity of the ternary operator is right-to-left. For instance:

    Code:
    a ? b : c ? d : e ? f : g;
    Nests like this:

    Code:
    a ? b : ( c ? d : ( e ? f : g ) )
    I have used this before as an alternative to:

    Code:
    if( a ) b;
    else if( c ) d;
    else if( e ) f;
    else g;
    When doing so, I write it this way:

    Code:
      a ? b
    : c ? d
    : e ? f
    : g;
    Last edited by brewbuck; 12-11-2009 at 12:14 PM.
    Code:
    //try
    //{
    	if (a) do { f( b); } while(1);
    	else   do { f(!b); } while(1);
    //}

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