Question

Can someone please tell me why the code below is not working?

    int prePos = 0;
    int preNeg = 0;

    int postPos = 0;
    int postNeg = 0;

    for (int i = 0; i < pin1.GetLength(0); i++)
    {
        preNeg++ ? pin1[i, 0] < 0 : prePos++; //not working
        pin2[i, 0] < 0 ? postNeg++ : postPos++; //not working
    }

So the condition is if pin1[i, 0] is smaller than zero, preNeg get incremented by one. Else prePos should be inceremeted. I can do this by normal if else but why this ternary is not working?

Answer 1

    preNeg++ ? pin1[i, 0] < 0 : prePos++; //not working
    pin2[i, 0] < 0 ? postNeg++ : postPos++; //not working

Because ternary operator returns a value that is assigned to a variable or property;

like

int a = true ? 1 : 0;

a will have 1

syntax of ternary operator is

var variable = condition ? 
              value_to_return_in_variable_if_condition_true :  
              value_to_return_in_variable_if_condition_false;

Moreover ternary operator is used to assign value to a single variable. not to two variables.