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

namespace ConsoleApplication6
{
class Average2
{
static void Main(string[] args)

{
int total, gradeCounter,gradeValue;

double average;
total = 0;
gradeCounter = 0;
Console.Write("Enter Integer grade,-1 to Quit:");
gradeCounter = Int32.Parse(Console.ReadLine());
if ( gradeCounter == -1 )
{
Console.WriteLine("No grades were entered.");
}
while (gradeValue != -1)
{
total = total + gradeValue;
gradeCounter = gradeCounter + 1;
Console.Write("Enter Integer Grade,-1 to Quit: ");
gradeCounter = Int32.Parse(Console.ReadLine());

average = (double)total / gradeCounter;
Console.WriteLine("\nClass average is {0}", average);
}


}
}
}


请帮我看一下这个问题出错了:提示上说, 使用了未赋值的局部变量“gradeValue”
但是我随便赋了一个值.要不能实现哨兵这个功能.

此问题比较有意思
期待答案

static void Main(string[] args)

{
int total, gradeCounter,gradeValue;

double average;
total = 0;
gradeCounter = 0;
Console.Write("Enter Integer grade,-1 to Quit:");
gradeCounter = Int32.Parse(Console.ReadLine());
if ( gradeCounter == -1 )
{
Console.WriteLine("No grades were entered.");
}
while (gradeValue != -1)
{
total = total + gradeValue;
gradeCounter = gradeCounter + 1;
Console.Write("Enter Integer Grade,-1 to Quit: ");
gradeCounter = Int32.Parse(Console.ReadLine());

average = (double)total / gradeCounter;
Console.WriteLine("\nClass average is {0}", average);
}


}

给gradeValue一个初值

我试过这个程序
定义为成员或者定义为变量都一样
total = total + gradeValue;
这句话执行完之后TOTAL还是一直为0
大家可以试一下
如果提示找不到空间
using System.Collections.Generic;
把这个改为
using System.Collections;
我是这么改的
调试了这个程序之后一直不理解为什么total咋就一直是0呢?

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

namespace ConsoleApplication6
{
class Average2
{
static void Main(string[] args)

{
int total=0, gradeCounter=0,gradeValue=0;

double average;
Console.Write("Enter Integer grade,-1 to Quit:");
gradeCounter = Int32.Parse(Console.ReadLine());
if ( gradeCounter == -1 )
{
Console.WriteLine("No grades were entered.");
}
while (gradeValue != -1)
{
total = total + gradeValue;
gradeCounter = gradeCounter + 1;
Console.Write("Enter Integer Grade,-1 to Quit: ");
gradeCounter = Int32.Parse(Console.ReadLine());

average = (double)total / gradeCounter;
Console.WriteLine("\nClass average is {0}", average);
}


}
}
}

这样就OK了，既然它告诉你使用了未赋值的变量，你就给它赋值呗

侠之大者你好.
赋了一个值之后虽然程序没有出什么错.
但是就没有实现哨兵控制重复结构问题.
而且平均值总是0.
这个程序要实现的功能是这样的:
假如你输入一个班的成绩.
你一直输下出.当你输入-1时程序就把平均成绩求出来.

晕,这个程序有个性. 两个参数到底在用谁做result?