Question

C#为什么会说我使用了“未赋值的局部变量d”

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

namespace ConsoleApplication1
{
class Program
{

delegate double mydelegate(double a, double b);
static double chen(double a, double b)
{
return a * b;
}
static double chu(double a, double b)
{
return a / b;
}
static double jia(double a, double b)
{
return a + b;
}
static void Main(string[] args)
{
mydelegate d;
Console.WriteLine("输入两个数字：");
double a = Convert.ToDouble(Console.ReadLine());
double b = Convert.ToDouble(Console.ReadLine());
Console.WriteLine("请输入运算符");
string h=Console.ReadLine();
if(h=="*")
d=new mydelegate(chen);
else if(h=="/")
d=new mydelegate(chu);

Console.WriteLine("result:{0}",d(a,b) );
Console.ReadKey();
}
}
}

Answer 1

挖一下一楼的墙角
mydelegate d = null;
Console.WriteLine("输入两个数字：");