Question

我正在试图弄清楚为什么我不能让我的方程式不能返回零，因为似乎由于某种原因，MathOperations方法没有做到这一点？如果有人可以提供帮助，我会非常感激。提前谢谢！

class MathUI
        {
            public void PromptForInt()
            {
                MathOperations ops = new MathOperations();
                Console.WriteLine("Enter first number to calculate");
                ops.Operand1 = int.Parse(Console.ReadLine());
                Console.WriteLine("\nEnter second number to calculate");
                ops.Operand2 = int.Parse(Console.ReadLine());
                return;
            }
            public void PromptForChoice()
            {
                int choice;

                MathOperations result = new MathOperations();
                Console.WriteLine("\nWhat type of operation would you like to perform?");
                Console.WriteLine("[1] Add \n[2] Subtract \n[3] Multiply \n[4] Divide \n[5] Exit \n");
                Console.Write("Enter your choice: ");
                choice = int.Parse(Console.ReadLine());

                if (choice == 1)
                {
                    Console.WriteLine(result.AddNumbers());
                }
                else if (choice == 2)
                {
                    Console.WriteLine(result.SubtractNumbers());
                }
                else if (choice == 3)
                {
                    Console.WriteLine(result.MultiplyNumbers());
                }
                else if (choice == 4)
                {
                    Console.WriteLine(result.DivideNumbers());
                }
                else if (choice == 5)
                {
                    Environment.Exit(0);
                }
                else
                {
                    Console.WriteLine("\nInvalid input entered!");
                }
            }

    class MathOperations
        {

            private int operand1;
            private int operand2;

            public int Operand1
            {
                get
                {
                    return operand1;
                }
                set
                {
                    operand1 = value;
                }
            }
            public int Operand2
            {
                get
                {
                    return operand2;
                }
                set
                {
                    operand2 = value;
                }
            }
            public MathOperations()
            {
                operand1 = 0;
                operand2 = 0;
            }
            public int AddNumbers()
            {
                return operand1 + operand2;
            }
            public int SubtractNumbers()
            {
                return operand1 - operand2;
            }
            public float DivideNumbers()
            {
                return (float)operand1 / (float)operand2;  // (float) used to show output with decimal point
            }
            public int MultiplyNumbers()
            {
                return operand1 * operand2;
            }

Answer 1

您正在为ops对象而不是结果对象设置operand1和operand2的值。

MathOperations ops = new MathOperations();
Console.WriteLine("Enter first number to calculate");
ops.Operand1 = int.Parse(Console.ReadLine());
Console.WriteLine("\nEnter second number to calculate");
ops.Operand2 = int.Parse(Console.ReadLine());

但是调用结果对象上的方法，其operand1和operand2初始化为0，因此函数的返回值。记得操作＆＃39; operand1和operand2保持用户的输入，而不是结果的operand1和operand2。您应该使用相同的ops对象进行结果计算。

否则...如果语句没有在C＃中正确返回方法方程式？

1 个答案: