What is the logic behind this code? The output is 34.

Question

string str = "012345";
str = str.Substring(0);
str = str.Substring(2);
str = str.Substring(0,3);
str = str.Substring(1,2);
Console.Write(str);

I want to understand it.

Answer 1

Originally
<str> = "012345"

// From index 0 to the last
str = str.Substring(0); // "012345"

// From index 2 to the last
str = str.Substring(2); // "2345"

// From index 0, 3 characters
str = str.Substring(0,3); // "234"

// From index 1, 2 characters
str = str.Substring(1,2); // "34"

Answer 2

Thank you Ipang. I was really confused.

Answer 3

No problem bro 👌