问题描述

怎么写出输入Y/N继续运算

class Operation
{
public int num1;
public int num2;

}
class Program
{
static void Main(string[] args)
{
Console.WriteLine(""请输入连个整数"");
OperationNum op = new OperationNum();
op.num1 = Convert.ToInt32(Console.ReadLine());
op.num2 = Convert.ToInt32(Console.ReadLine());
// int num1 = Convert.ToInt32(Console.ReadLine());
// int num2 = Convert.ToInt32(Console.ReadLine());
Console.WriteLine(""请选择运算符 n1.加法n2.减法n3.乘法n4.除法 "");

int s = 0;
s = Convert.ToInt32(Console.ReadLine());
switch (s)
{
case 1:
Console.WriteLine(""{0}+{1}={2}""op.num1op.num2op.Add());

break;
case 2:
Console.WriteLine(""差为{0}"" op.Sub());
break;
case 3:
Console.WriteLine(""积为{0}"" op.Mul());
break;
case 4:
Console.WriteLine(""商为{0}"" op.Mul());
break;

}

}
}
class OperationNum : Operation
{
public int Add()
{
return num1 + num2;
}
public int Sub()
{
return num1 - num2;
}
public int Mul()
{
return num1 * num2;
}
public int Div()
{
return num1 + num2;
}
}

解决方案

把代码放到while（true）{}里面，当你输入n的时候break就行

解决方案二：
挺简单的，主程序这修改就行。

     while (true)            {                Console.WriteLine(""请输入两个整数"");                OperationNum op = new OperationNum();                op.num1 = Convert.ToInt32(Console.ReadLine());                op.num2 = Convert.ToInt32(Console.ReadLine());                Console.WriteLine(""请选择运算符 n1.加法n2.减法n3.乘法n4.除法 "");                int s = 0;                s = Convert.ToInt32(Console.ReadLine());                switch (s)                {                    case 1:                        Console.WriteLine(""{0}+{1}={2}"" op.num1 op.num2 op.Add());                        break;                    case 2:                        Console.WriteLine(""差为{0}"" op.Sub());                        break;                    case 3:                        Console.WriteLine(""积为{0}"" op.Mul());                        break;                    case 4:                        Console.WriteLine(""商为{0}"" op.Div());                        break;                    default:                        break;                }                Console.WriteLine(""请输入Y/N继续或退出"");                string yesorno = Console.ReadLine();                if (yesorno == ""Y"" || yesorno == ""y"")                    continue;                else if (yesorno == ""N"" || yesorno == ""n"")                    break;                else                    Console.WriteLine(""error"");            }

或者

            bool ck = true;            while (ck)            {                Console.WriteLine(""请输入两个整数"");                OperationNum op = new OperationNum();                op.num1 = Convert.ToInt32(Console.ReadLine());                op.num2 = Convert.ToInt32(Console.ReadLine());                Console.WriteLine(""请选择运算符 n1.加法n2.减法n3.乘法n4.除法 "");                int s = 0;                s = Convert.ToInt32(Console.ReadLine());                switch (s)                {                    case 1:                        Console.WriteLine(""{0}+{1}={2}"" op.num1 op.num2 op.Add());                        break;                    case 2:                        Console.WriteLine(""差为{0}"" op.Sub());                        break;                    case 3:                        Console.WriteLine(""积为{0}"" op.Mul());                        break;                    case 4:                        Console.WriteLine(""商为{0}"" op.Div());                        break;                    default:                        break;                }                Console.WriteLine(""请输入Y/N继续或退出"");                string yesorno = Console.ReadLine().ToLower();                if (yesorno == ""y"")                    continue;                else if (yesorno == ""n"")                    ck = false;                else                    Console.WriteLine(""error"");            }