conditional-operator

I use C# ? operator when I have if-statements that affects one row and it's all good. But lets say I have this code (using classic if-statements): if(someStatement) { someBool = true; //someBools value is unknown } else { //Do nothing } This can be achieved on a one-liner by doing: someBool = (someStatement) ? true : someBool; But why can't I do something like this: someBool = (someStatement) ? true : ; //or possibly someBool = (someStatement) ? true; Is this possible in some way? If it is, is there any benefits of using one method over the other? And if not, why shouldn't you be able to do it

I'm learning F# coming from C# and I've just tried compiling an expression like let y = Seq.groupBy (fun x -> (x < p ? -1 : x == p ? 0: 1)) but see 'unexpected integer literal in expression'. Does F# have a ternary operator? If not, what should I use instead? Yes, it's called if .. then .. else In fact in F# everything is an expression, even an if .. then .. else block. In C# var x = true ? 0 : 1; In F# let x = if true then 0 else 1 So in your case: let y = Seq.groupBy (fun x -> if x < p then -1 else if x = p then 0 else 1) you can shorten it a bit with elif let y = Seq.groupBy (fun x -> if x

This question already has an answer here: ternary operator in matlab 7 answers Is there a one-liner in MATLAB for this? if a > b foo = 'r'; else foo = 'g'; end Not as elegant as a C style ternary operator but you can take advantage of the fact that matlab will automatically cast logicals into doubles in this situation. So you can just multiply your desired result for true ( r in this case) by your condition ( a > b ), and add that to the product of your desired result for false (i.e. g ) with the not of your condition: foo = (a > b)*c + (~(a > b))*d so if we let c = 'r' and d = 'g' then all we

I need to dynamically choose the width of a <p:panelGrid> based on a backing bean property. However it is not working for me. I have a feeling that I have some syntax error in my code. <p:panelGrid style="width:#{myBean.fromCCRM} ?70%:90%"> ... </p:panelGrid> siebz0r The entire statement needs to go inside #{...} . style="width:#{myBean.fromCCRM ? '70%' : '90%'}" 来源： https://stackoverflow.com/questions/12292397/how-to-use-el-conditional-operator-in-jsf-component-attribute

As per C precedence tables, the ternary conditional operator has right-to-left associativity. So, is it directly convertible to the equivalent if-else ladder? For example, can: x?y?z:u:v; be interpreted as: if(x) { if(y) { z; } else { u; } } else { v; } by matching an else ( : ) with the closest unpaired if ( ? )? Or does right-to-left associativity imply some other arrangement? interjay The example you gave could only be interpreted in one way (like the if statements you gave), whether the ternary operator had right-to-left or left-to-right associativity. Where the right-to-left associativity

Can you please run the below and explain? Object o = true ? new Integer(1) : new Double(2.0); System.out.println(o); I found that surprising as someone would expect 1 to be printed and not 1.0 It's not a surprise at all, although it might seem like one. The behaviour is specified in JLS §15.25 - Conditional Operator : Otherwise, if the second and third operands have types that are convertible (§5.1.8) to numeric types, then there are several cases: If one of the operands is of type byte or Byte and the other is of type short or Short , then the type of the conditional expression is short . [..