iOS Ternary Operator

I saw someone ask User? YES: What does NO mean, just talk about a ternary operator

1. Basic format: (Relational expression)? Expression 1: Expression 2;

　　　  Execution process: The relational expression is true and return expression 1 The relational expression is false and return expression 2

for example

    MZUserApplication *USER;
    if (USER?YES:NO){
        NSLog(@"yes");
        
    }else{
        NSLog(@"no");
        
    }

Explanation: Since USER is not initialized and is a null pointer, it returns expression 2, that is, print no

Give another example

    int A = 5;
    int B = 3;

    int C = A>B?A:B;
    NSLog(@"%i",C);

Since A>B is true, return the first expression, that is, C = 5, print 5

Classmates understand