/* A Programmer's Introduction to C# (Second Edition) by Eric Gunnerson Publisher: Apress L.P. ISBN: 1-893115-62-3 */ // 25 - Operator OverloadingA Complex Number Class // copyright 2000 Eric Gunnerson using System; struct Complex { float real; float imaginary; public Complex(float real, float imaginary) { this.real = real; this.imaginary = imaginary; } public float Real { get { return(real); } set { real = value; } } public float Imaginary { get { return(imaginary); } set { imaginary = value; } } public override string ToString() { return(String.Format("({0}, {1}i)", real, imaginary)); } public static bool operator==(Complex c1, Complex c2) { if ((c1.real == c2.real) && (c1.imaginary == c2.imaginary)) return(true); else return(false); } public static bool operator!=(Complex c1, Complex c2) { return(!(c1 == c2)); } public override bool Equals(object o2) { Complex c2 = (Complex) o2; return(this == c2); } public override int GetHashCode() { return(real.GetHashCode() ^ imaginary.GetHashCode()); } public static Complex operator+(Complex c1, Complex c2) { return(new Complex(c1.real + c2.real, c1.imaginary + c2.imaginary)); } public static Complex operator-(Complex c1, Complex c2) { return(new Complex(c1.real - c2.real, c1.imaginary - c2.imaginary)); } // product of two complex numbers public static Complex operator*(Complex c1, Complex c2) { return(new Complex(c1.real * c2.real - c1.imaginary * c2.imaginary, c1.real * c2.imaginary + c2.real * c1.imaginary)); } // quotient of two complex numbers public static Complex operator/(Complex c1, Complex c2) { if ((c2.real == 0.0f) && (c2.imaginary == 0.0f)) throw new DivideByZeroException("Can't divide by zero Complex number"); float newReal = (c1.real * c2.real + c1.imaginary * c2.imaginary) / (c2.real * c2.real + c2.imaginary * c2.imaginary); float newImaginary = (c2.real * c1.imaginary - c1.real * c2.imaginary) / (c2.real * c2.real + c2.imaginary * c2.imaginary); return(new Complex(newReal, newImaginary)); } // non-operator versions for other languages public static Complex Add(Complex c1, Complex c2) { return(c1 + c2); } public static Complex Subtract(Complex c1, Complex c2) { return(c1 - c2); } public static Complex Multiply(Complex c1, Complex c2) { return(c1 * c2); } public static Complex Divide(Complex c1, Complex c2) { return(c1 / c2); } } public class AComplexNumberClass { public static void Main() { Complex c1 = new Complex(3, 1); Complex c2 = new Complex(1, 2); Console.WriteLine("c1 == c2: {0}", c1 == c2); Console.WriteLine("c1 != c2: {0}", c1 != c2); Console.WriteLine("c1 + c2 = {0}", c1 + c2); Console.WriteLine("c1 - c2 = {0}", c1 - c2); Console.WriteLine("c1 * c2 = {0}", c1 * c2); Console.WriteLine("c1 / c2 = {0}", c1 / c2); } }
ASP.NET & Csharp (C#)
ASP.NET & Csharp (C#) , Here you can find my posts about .NET c# .
Demonstates using checked keyword to detect an overflow 2
/* C# Programming Tips & Techniques by Charles Wright, Kris Jamsa Publisher: Osborne/McGraw-Hill (December 28, 2001) ISBN: 0072193794 */ // // OvrFlow1.cs -- Demonstates using checked keyword to detect an overflow. // // Compile this program with the following command line: // C:>csc OvrFlow1.cs // namespace nsOverflow { using System; public class OvrFlow1 { static public void Main () { int large = 2147483647; int larger = large; try { larger = checked (++larger); } catch (OverflowException e) { Console.WriteLine ("The operation caused an overflow"); Console.WriteLine (e.Message); } Console.WriteLine ("large = " + large); Console.WriteLine ("larger = " + larger); } } }
Demonstates using checked keyword to detect an overflow
// Compile this program with the following command line: // C:>csc /checked OvrFlow2.cs using System; public class OvrFlow2 { static public void Main () { int large = 2147483647; int larger = large; unchecked { ++larger; larger *= 2; } Console.WriteLine ("large = " + large); Console.WriteLine ("larger = " + larger); } }
Operators and Expressions:Checked and Unchecked Expressions
using System; public class CheckedandUncheckedExpressions { public static void Main() { unchecked { byte a = 55; byte b = 210; byte c = (byte) (a + b); } } }
unchecked int overflow
using System; class IntegerOverFlowConst { static void Main() { const ushort MAXUSHORT = 65535; const ushort ONE = 1; unchecked { ushort total = (short)MAXUSHORT + ONE; } } }
Checking for overflows.
using System; public class MainClass { public int CheckedAddition(short s1, short s2) { int z = 0; try { z = checked((short)(s1 + s2)); } catch (OverflowException) { Console.WriteLine("Overflow Exception, Returning 0"); } return z; } public int UncheckedAddition(short s1, short s2) { int z = ((short)(s1 + s2)); return z; } public static void Main() { MainClass app = new MainClass(); short s1 = 32767; short s2 = 32767; Console.WriteLine("Checked Addition is: {0}",app.CheckedAddition(s1, s2)); Console.WriteLine("Unchecked Addition is: {0}",app.UncheckedAddition(s1, s2)); } }
Checked and Unchecked
using System; using System.Collections.Generic; using System.Text; class Program { static void Main(string[] args) { Console.WriteLine("Max value of byte is {0}.", byte.MaxValue); Console.WriteLine("Min value of byte is {0}.", byte.MinValue); byte b1 = 100; byte b2 = 250; try { checked { byte sum = (byte)(b1 + b2); byte b4, b5 = 100, b6 = 200; b4 = (byte)(b5 + b6); Console.WriteLine("sum = {0}", sum); } } catch (OverflowException e) { Console.WriteLine(e.Message); } unchecked { byte sum = (byte)(b1 + b2); Console.WriteLine("sum = {0}", sum); } } }