Complex复数类
var z1 = new Complex(); // this creates complex zero (0, 0)
var z2 = new Complex(2, 4);
var z3 = new Complex(3, 5);
Console.WriteLine("Complex zero: " + z1);
Console.WriteLine(z2 + " + " + z3 + " = " + (z2 + z3));
Console.WriteLine("|z2| = " + z2.Magnitude);
Console.WriteLine("Phase of z2 = " + z2.Phase);2.我们可以使用一个ComplexFormatter类来辅助我们做格式化输出，如下：using System;
using System.Numerics;
public class ComplexFormatter :IFormatProvider, ICustomFormatter
{
public object GetFormat(Type formatType)
{
if (formatType == typeof(ICustomFormatter))
return this;
else
return null;
}
public string Format(string format, object arg,
IFormatProvider provider)
{
if (arg is Complex)
{
Complex c1 = (Complex) arg;
// Check if the format string has a precision specifier.
int precision;
string fmtString = String.Empty;
if (format.Length > 1) {
try {
precision = Int32.Parse(format.Substring(1));
}
catch (FormatException) {
precision = 0;
}
fmtString = "N" + precision.ToString();
}
if (format.Substring(0, 1).Equals("I", StringComparison.OrdinalIgnoreCase))
return c1.Real.ToString("N2") + " + " + c1.Imaginary.ToString("N2") + "i";
else if (format.Substring(0, 1).Equals("J", StringComparison.OrdinalIgnoreCase))
return c1.Real.ToString("N2") + " + " + c1.Imaginary.ToString("N2") + "j";
else
return c1.ToString(format, provider);
}
else
{
if (arg is IFormattable)
return ((IFormattable) arg).ToString(format, provider);
else if (arg != null)
return arg.ToString();
else
return String.Empty;
}
}
}
var z2 = new Complex(2, 4);
var z3 = new Complex(3, 5);
Console.WriteLine("Complex zero: " + z1);
Console.WriteLine(z2 + " + " + z3 + " = " + (z2 + z3));
Console.WriteLine("|z2| = " + z2.Magnitude);
Console.WriteLine("Phase of z2 = " + z2.Phase);2.我们可以使用一个ComplexFormatter类来辅助我们做格式化输出，如下：using System;
using System.Numerics;
public class ComplexFormatter :IFormatProvider, ICustomFormatter
{
public object GetFormat(Type formatType)
{
if (formatType == typeof(ICustomFormatter))
return this;
else
return null;
}
public string Format(string format, object arg,
IFormatProvider provider)
{
if (arg is Complex)
{
Complex c1 = (Complex) arg;
// Check if the format string has a precision specifier.
int precision;
string fmtString = String.Empty;
if (format.Length > 1) {
try {
precision = Int32.Parse(format.Substring(1));
}
catch (FormatException) {
precision = 0;
}
fmtString = "N" + precision.ToString();
}
if (format.Substring(0, 1).Equals("I", StringComparison.OrdinalIgnoreCase))
return c1.Real.ToString("N2") + " + " + c1.Imaginary.ToString("N2") + "i";
else if (format.Substring(0, 1).Equals("J", StringComparison.OrdinalIgnoreCase))
return c1.Real.ToString("N2") + " + " + c1.Imaginary.ToString("N2") + "j";
else
return c1.ToString(format, provider);
}
else
{
if (arg is IFormattable)
return ((IFormattable) arg).ToString(format, provider);
else if (arg != null)
return arg.ToString();
else
return String.Empty;
}
}
}
3.使用如下：
Complex c1 = new Complex(12.1, 15.4);
Console.WriteLine("Formatting with ToString():" + c1.ToString());
Console.WriteLine("Formatting with ToString(format): " + c1.ToString("N2"));
Console.WriteLine("Custom formatting with I0:" + String.Format(new ComplexFormatter(), "{0:I0}", c1));
Console.WriteLine("Custom formatting with J3:" + String.Format(new ComplexFormatter(), "{0:J3}", c1));
Console.WriteLine("Formatting with ToString():" + c1.ToString());
Console.WriteLine("Formatting with ToString(format): " + c1.ToString("N2"));
Console.WriteLine("Custom formatting with I0:" + String.Format(new ComplexFormatter(), "{0:I0}", c1));
Console.WriteLine("Custom formatting with J3:" + String.Format(new ComplexFormatter(), "{0:J3}", c1));
