Check runtime overflow

checked operator checks the runtime overflow.

The checked operator tells the runtime to generate an OverflowException.


using System;

class Program
{
    static void Main(string[] args)
    {
        int i = int.MinValue;

        int result = checked(i - 1);

        Console.WriteLine("i=" + i);

        Console.WriteLine("result="+result);
        Console.WriteLine("result is int.MaxValue:" + (result == int.MaxValue));


    }
}

The output:


Unhandled Exception: System.OverflowException: Arithmetic operation resulted in
an overflow.
   at Program.Main(String[] args)

Other than expression checking shown in the code above, checked operator can also check a block of code.


using System;

class Program
{
    static void Main(string[] args)
    {
        int i = int.MinValue;

        checked {
            int result = i - 1;

            Console.WriteLine("i=" + i);

            Console.WriteLine("result=" + result);
            Console.WriteLine("result is int.MaxValue:" + (result == int.MaxValue));
        }
    }
}

The output:


Unhandled Exception: System.OverflowException: Arithmetic operation resulted in
an overflow.
   at Program.Main(String[] args)

« Integral type overflow

Turn on the overflow checking by compiling »

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