C＃方法返回

Question

我正在寫一個關於3種不同方法簡單計算的程序。 我的代碼工作正常，但它不會將結果返回到Main。

任何人都可以幫助我找到什麼是我的問題？

這裏是我的代碼

static void Main(string[] args) 
{ 
    Console.Write("Enter the first number\t"); 
    int number1 = Convert.ToInt32(Console.ReadLine()); 
    Console.Write("Enter the second number\t"); 
    int number2 = Convert.ToInt32(Console.ReadLine()); 

    sum(number1, number2); 
    difference(number1, number2); 
    multiplies(number1, number2);    
} 

public static int sum(int number1, int number2) 
{ 
    Console.WriteLine("Sum is:"); 
    return number1 + number2; 
} 

public static int difference(int number1, int number2) 
{ 
    Console.WriteLine("difference is:"); 
    return number1 - number2; 
} 

public static int multiplies(int number1, int number2) 
{ 
    Console.WriteLine("multiplies:"); 
    return number1 - number2; 
} 

預先感謝您。 :)

Answer 1

您已經從main調用該方法，所有處理您的輸入都正確並將結果返回給main，但您尚未收到變量的值或顯示該方法的返回值，則顯示導致這樣的：

Console.Write("{0} + {1} = {2}",number1,number2,sum(number1, number2)); 
console.Write("{0} - {1} = {2}",number1,number2,difference(number1, number2)); 
Console.Write("{0} * {1} = {2}",number1,number2,multiplies(number1, number2)); 

讓輸入是10和5然後將上面的代碼顯示結果如下所示：

10 + 5 = 15 
10 - 5 = 5 
10 * 5 = 50 

或者使用變量來存儲第r eturn值，然後繼續這些值。

int sumResult = sum(number1, number2); 
int diffResult = difference(number1, number2); 
int mulResult = multiplies(number1, number2); 

Answer 2

改變你的主要方法如下。

static void Main(string[] args) 
    { 

     Console.Write("Enter the first number\t"); 
     int number1 = Convert.ToInt32(Console.ReadLine()); 
     Console.Write("Enter the second number\t"); 
     int number2 = Convert.ToInt32(Console.ReadLine()); 

     Console.WriteLine(sum(number1, number2)); 
     Console.WriteLine(difference(number1, number2)); 
     Console.WriteLine(multiplies(number1, number2)); 


    } 

Answer 3

解決方案1：

static void Main(string[] args) 
     { 

      Console.Write("Enter the first number\t"); 
      int number1 = Convert.ToInt32(Console.ReadLine()); 
      Console.Write("Enter the second number\t"); 
      int number2 = Convert.ToInt32(Console.ReadLine()); 

      sum(number1, number2); 
      difference(number1, number2); 
      multiplies(number1, number2); 
     } 

     public static void sum(int number1, int number2) 
     { 
      Console.WriteLine(string.Format("Sum is: {0}", number1 + number2)); 
     } 

     public static void difference(int number1, int number2) 
     { 
      Console.WriteLine(string.Format("difference is: {0}", number1 - number2)); 
     } 
     public static void multiplies(int number1, int number2) 
     { 
      Console.WriteLine(string.Format("multiplies : {0}", number1 * number2)); 
     } 

解決方案2：

static void Main(string[] args) 
     { 

      Console.Write("Enter the first number\t"); 
      int number1 = Convert.ToInt32(Console.ReadLine()); 
      Console.Write("Enter the second number\t"); 
      int number2 = Convert.ToInt32(Console.ReadLine()); 

      Console.WriteLine(sum(number1, number2)); 
      Console.WriteLine(difference(number1, number2)); 
      Console.WriteLine(multiplies(number1, number2)); 

     } 

     public static int sum(int number1, int number2) 
     { 
      Console.WriteLine("Sum is:"); 
      return number1 + number2; 
     } 

     public static int difference(int number1, int number2) 
     { 
      Console.WriteLine("difference is:"); 
      return number1 - number2; 
     } 
     public static int multiplies(int number1, int number2) 
     { 
      Console.WriteLine("multiplies:"); 
      return number1 * number2; 
     } 

的問題是，你是不是打印結果到控制檯。

Answer 4

您可以通過以下方式做到這一點：

static void Main(string[] args) 
     { 
      Console.Write("Enter the first number\t"); 
      int number1 = Convert.ToInt32(Console.ReadLine()); 
      Console.Write("Enter the second number\t"); 
      int number2 = Convert.ToInt32(Console.ReadLine()); 
      int result1=sum(number1, number2); 
      Console.WriteLine(result1); 
      int result2=difference(number1, number2); 
      Console.WriteLine(result2); 
      int result3=multiplies(number1, number2); 
      Console.WriteLine(result3); 
      Console.ReadLine(); 
     } 
     public static int sum(int number1, int number2) 
     { 
      Console.WriteLine("Sum is:"); 
      return number1 + number2; 
     } 

     public static int difference(int number1, int number2) 
     { 
      Console.WriteLine("difference is:"); 
      return number1 - number2; 
     } 
     public static int multiplies(int number1, int number2) 
     { 
      Console.WriteLine("multiplies:"); 
      return number1*number2; 
     }