控制檯不會打印出我的方法中的信息

Question

當我嘗試輸出方法調用時，我得到一個空白屏幕，當我按任意鍵時，顯示命名空間，然後控制檯關閉。任何人都可以看到我在這裏失蹤的內容

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 

namespace programming_2 
{ 
class Driver 
{ 
    static void Main(string[] args) 
    { 

     fraction frac = new fraction(); // we'll get 0/1 
     frac = new fraction(1, 5);  // we'll get 1/5 
     // frac = new fraction(25);  // we'll get 25/1 
     //frac = new fraction(9.25);  // we'll get 37/4 
     //frac = new fraction("6.25"); // we'll get 25/4 

     //frac = new fraction(System.Console.ReadLine()); 


     Console.Write(frac); 
     // displays the current value of frac object; 

     Console.WriteLine("Press any key to continue.."); 
     Console.ReadKey(); 
    } 
} 
} 

Fraction類

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 

namespace programming_assignment_2 
{ 
class fraction : ICloneable, IEnumerable<fraction>, IEnumerator<fraction>, IComparer<fraction> 
{ 

     private int num, den; 

     // Constructors 

     public fraction() 
     { 
      Initialize(0, 1); 
     } 

     public fraction(int num) 
     { 
      CheckMinValue(num); 
      Initialize(num, 1); 
     } 

     public fraction(fraction f) 
     { 
      Initialize(f.num, f.den); 
     } 

     public fraction(int num, int den) 
     { 
      CheckDenominatorZero(den); 

      CheckMinValue(num); 
      CheckMinValue(den); 

      fraction f = new fraction((decimal)num, (decimal)den); 
      Initialize(f.num, f.den); 
     } 

     private static void CheckMinValue(int n) 
     { 
      if (n == int.MinValue) 
       throw new OverflowException(); 
     } 

     private void Initialize(int num, int den) 
     { 
      this.num = num; 
      this.den = den; 
     } 

     private fraction(decimal r1, decimal r2) 
     { 
      decimal gcd = GCD(Math.Abs(r1), Math.Abs(r2)); 

      int num = (int)(r1/gcd); 
      int den = (int)(r2/gcd); 

      CheckMinValue(num); 
      CheckMinValue(den); 

      if (r2 < 0) 
      { 
       num = -num; 
       den = -den; 
      } 

      this.num = num; 
      this.den = den; 
     } 



     public int Numerator 
     { 
      get { return this.num; } 
     } 

     public int Denominator 
     { 
      get { return this.den; } 
     } 

     // Overloaded Operators (+-*/^) 

     // Add 

     public static fraction operator +(fraction a, fraction b) 
     { 
      decimal d1 = (decimal)a.num * b.den + (decimal)b.num * a.den; 
      decimal d2 = (decimal)a.den * b.den; 
      return new fraction(d1, d2); 
     } 

     public static fraction operator +(fraction a, int b) 
     { 
      return a + new fraction(b); 
     } 

     public static fraction operator +(int a, fraction b) 
     { 
      return new fraction(a) + b; 
     } 


     // Substract 

     public static fraction operator -(fraction a, fraction b) 
     { 
      decimal r1 = (decimal)a.num * b.den - (decimal)b.num * a.den; 
      decimal r2 = (decimal)a.den * b.den; 
      return new fraction(r1, r2); 
     } 

     public static fraction operator -(fraction a, int b) 
     { 
      return a - new fraction(b); 
     } 

     public static fraction operator -(int a, fraction b) 
     { 
      return new fraction(a) - b; 
     } 


     // Multiply 

     public static fraction operator *(fraction a, fraction b) 
     { 
      decimal r1 = (decimal)a.num * b.num; 
      decimal r2 = (decimal)a.den * b.den; 
      return new fraction(r1, r2); 
     } 

     public static fraction operator *(fraction a, int b) 
     { 
      return a * new fraction(b); 
     } 

     public static fraction operator *(int a, fraction b) 
     { 
      return new fraction(a) * b; 
     } 



     // Divide 

     public static fraction operator /(fraction a, fraction b) 
     { 
      decimal r1 = (decimal)a.num * b.den; 
      decimal r2 = (decimal)a.den * b.num; 

      if (r2 == 0) 
       throw new DivideByZeroException(); 
      else 
       return new fraction(r1, r2); 
     } 

     public static fraction operator /(fraction a, int b) 
     { 
      return a/new fraction(b); 
     } 

     public static fraction operator /(int a, fraction b) 
     { 
      return new fraction(a)/b; 
     } 


     // Exponents 

     public static fraction operator ^(fraction a, int n) 
     { 
      return new fraction((decimal)Math.Pow(a.num, n), (decimal)Math.Pow(a.den, n)); 
     } 



     // Comparison operators 

     public static bool operator ==(fraction a, fraction b) 
     { 
      return (decimal)a.num * b.den == (decimal)b.num * a.den; 
     } 

     public static bool operator !=(fraction a, fraction b) 
     { 
      return (!(a == b)); 
     } 

     public static bool operator >(fraction a, fraction b) 
     { 
      return (decimal)a.num * b.den > (decimal)b.num * a.den; 
     } 

     public static bool operator >=(fraction a, fraction b) 
     { 
      return (!(a < b)); 
     } 

     public static bool operator <(fraction a, fraction b) 
     { 
      return (decimal)a.num * b.den < (decimal)b.num * a.den; 
     } 

     public static bool operator <=(fraction a, fraction b) 
     { 
      return (!(a > b)); 
     } 




     public static decimal GCD(decimal a, decimal b) 
     { 
      if (b == 0) 
       return a; 
      return GCD(b, a % b); 
     } 

     private static void CheckDenominatorZero(decimal den) 
     { 
      if (den == 0) 
       throw new ArithmeticException("The denominator can't be zero!!"); 
     } 



    } 




} 

Answer 1

什麼是部分類？它有一個ToString（）方法可以打印出來嗎？

這適用於我。

static void Main(string[] args) 
     { 

      var frac = new fraction(1,5); 

      Console.WriteLine(frac); 
      Console.WriteLine("Press any key to continue.."); 
      Console.ReadKey(); 
     } 



public class fraction 
    { 
     public int nom { get; set; } 
     public int denom { get; set; } 
     public fraction(int n, int d) 
     { 
      nom = n; 
      denom = d; 

     } 

     public override string ToString() 
     { 
      return string.Format("{0}\\{1}", nom, denom); 
     } 
    } 

Answer 2

在你的代碼，它看起來像你有一個無限循環：

public fraction(int num, int den) 
{ 
    CheckDenominatorZero(den); 

    CheckMinValue(num); 
    CheckMinValue(den); 

    // You are creating a new instance in the creation of a new instance 
    fraction f = new fraction((decimal)num, (decimal)den); 
    Initialize(f.num, f.den); 
} 

試試這個：

// Remove this line: 
    fraction f = new fraction((decimal)num, (decimal)den); 
    // And change the next line to this: 
    Initialize(num, den); 

變更後：

public fraction(int num, int den) 
{ 
    CheckDenominatorZero(den); 

    CheckMinValue(num); 
    CheckMinValue(den); 

    Initialize(num, den); 
} 

此外，正如其他人有說過，你應該重寫ToString這樣你的控制檯輸出看起來不錯：

public override string ToString() 
    { 
     return string.Format("{0}\\{1}", this.num, this.den); 
    }