Question

As i am new to C# programming language i am a little confused about C# syntax.

A method which can get two values to compare those two values can be written as a.compareTo(b) instead of compareTo(a,b) How is it possible?

Assuming that compareTo returning an int the variable a is chained to int and gets compared! How?

Thank you in advance.

Answer 1

In C#, the int keyword actually represents a structure of type System.Int32. This type has several methods available on it, one of those being CompareTo(Int32) as you have seen.

CompareTo for an Int32 object takes in an integer value, compares that value to itself and returns the result, very simply like this:

public int CompareTo(int value)
{
    if (this < value)
    {
        return -1;
    }
    if (this > value)
    {
        return 1;
    }
    return 0;
}

The this keyword refers to the current instance of the Type that this method belongs to, in your case a.

The documentation for Int32 and its methods can be found here.