Question

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What is a Question Mark “?” and Colon “:” Operator Used for?
Question mark in java code

I am writing codes for a RBG to HSV converter.
I have this line:

var d = (r==minRGB) ? g-b : ((b==minRGB) ? r-g : b-r);

i dont really understand what the “?” and the “:” means here.

Answer 1

Its Ternary Operator:

C = condition? A : B

is equivalent to

 if (condition){
  C=  A;
 } else{
   C=  B;
 }

It also support nesting i.e. C = condition1? A : condition2?D:E, which is equivalent to

 if (condition1){
   C=  A;
 } else if (condition2){
   C=  D;
 } else{
   C= E;
 }