C Sharp —

checked and unchecked

These two operators control overflow checking for mathematical operations. Because these operators deal specifically with error handling, they are covered in Chapter 12, "Error Handling with Exceptions." -

Mathematical Operators

The C# language supports the basic mathematical operators that almost all programming languages support: multiplication (*), division (/), addition (+), subtraction (-), and modulus (%). The first four operators are obvious in their meaning; the modulus operator produces the remainder from integer division. The following code illustrates these mathematical operators in use: -

using System;
class MathOpsApp
{
    public static void Main()
    {
        // The System.Random class is part of the .NET
        // Framework class library. Its default constructor
        // seeds the Next method using the current date/time.
        Random rand = new Random();
        int a, b, c;
        a = rand.Next() % 100; // Limit max to 99.
        b = rand.Next() % 100; // Limit max to 99.
        Console.WriteLine("a={0} b={1}", a, b);
        c = a * b;
        Console.WriteLine("a * b = {0}", c);
        // Note the following code uses integers. Therefore,
        // if a is less than  b, the result will always
        // be 0. To get a more accurate result, you would
        // need to use variables of type double or float.
        c = a / b;
        Console.WriteLine("a / b = {0}", c);
        c = a + b;
        Console.WriteLine("a + b = {0}", c);
        c = a - b;
        Console.WriteLine("a - b = {0}", c);
        c = a % b;
        Console.WriteLine("a % b = {0}", c);
    }
}