problem to understand the code

j == (intJaggedArray3[i].Length - 1) ? "" : " "  

this is conditional statement in which  intJaggedArray3[i].Length – 1 getting an array length -1 if its try it print nothing also its false it will print nothing.

This is what this line is doing  

Note:-The conditional operator (?:) returns one of two values depending on the value of a Boolean expression. Following is the syntax for the conditional operator.

condition ? first_expression : second_expression;

However, the high-level ternary statement is useful because it allows you to condense multiple if-statements and reduce nesting. It does not actually eliminate branching. It simplifies the high-level representation of the branching.

C# program that uses ternary operator

using System;

class Program

{

    static void Main()

    {

        //

        // If the expression is true, set value to 1.

        // Otherwise, set value to -1.

        //

        int value = 100.ToString() == "100" ?

            1 :

            -1;

        Console.WriteLine(value);

    }

}

Output

1