使用未分配的局部变量“ a”

Question

I am Learning c#, but suddenly the compiler in c# express edition 2008 says Use of unassigned local variable 'a', even with the simplest codes.

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

namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
int a;
a++;
Console.WriteLine(a);

}
}
}

That one gave an error.

Answer 1

You have to initialize (assign something to) your a variable before you can use it. Basically compiler doesn't know what is a starting value of a variable. In this case it doesn't know the value of a , you have to assing something to it:

int a = 0;
a++;

Answer 2

Before Initializing the value to the variable you cannot increment or decrement it. so initialize it. The use it.