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< Operator (C# Reference)

All numeric and enumeration types define a "less than" relational operator (<) that returns true if the first operand is less than the second, false otherwise.

User-defined types can overload the < operator (see operator). If < is overloaded, > must also be overloaded. When a binary operator is overloaded, the corresponding assignment operator, if any, is also implicitly overloaded.

// cs_operator_less_than.cs
using System;
class MainClass
    static void Main() 
        Console.WriteLine(1 < 1.1);
        Console.WriteLine(1.1 < 1.1);