本学期我正在上C＃课程，到目前为止它非常有趣。我有一个任务，我需要用数组做几件事：在数组中添加数字，查看数组中输入的数字，在数组中查找数字，对数组中的数字进行排序，根据数组数创建统计数据，最后退出应用程序。
到目前为止，我一直在向阵列添加数字时遇到一些问题，同时确保输入的数据只是数字。我想我即将解决这个问题，但总是很感激帮助。而且，我的findData（）方法看起来不错吗？
再次感谢您抽出时间阅读此问题！
class Program
{
static char myChoice = Console.ReadKey().KeyChar;
static double[] myArray = new double[100];
static void Main(string[] args)
{
while (true)
{
Console.WriteLine("Welcome to Lab 2");
Console.WriteLine();
Console.WriteLine("Main Menu");
Console.WriteLine("1- Add new data");
Console.WriteLine("2- See all data");
Console.WriteLine("3- Find a number");
Console.WriteLine("4- Sort the data");
Console.WriteLine("5- Create statistics");
Console.WriteLine("6- Exit Program");
switch (myChoice)
{
case '1':
Console.WriteLine("1- Add new data");
addData();
break;
case '2':
Console.WriteLine("2- See all data");
seeData();
break;
case '3':
Console.WriteLine("3- Find a number");
findData();
break;
case '4':
Console.WriteLine("4- Sort the data");
sortData();
break;
case '5':
Console.WriteLine("5- Create statistics");
createData();
break;
case '6':
Console.WriteLine();
exitProgram();
break;
}
}
}
//This method will add numbers to the array
public static void addData()
{
bool isNumber = false;
double number;
double temp;
for (int i = 0; i < myArray.Length; i++)
{
Console.WriteLine("Enter a number you would like to add");
myArray[i] = Convert.ToDouble(Console.ReadLine());
temp = myArray[i];
if (!Double.TryParse(temp, out number))
{
Console.WriteLine("Invalid input. Please enter a valid number")
}
else
{
}
}
}
//This method will see the numbers entered in the array
public static void seeData()
{
foreach (var item in myArray)
{
Console.WriteLine(item.ToString());
}
}
//This method will find a specific number within the array and check if it has already been entered
public static void findData()
{
Console.WriteLine("Find a number");
string myChoice = Console.ReadLine();
double number;
bool isNumber = Double.TryParse(myChoice, out number);
{
}
}
//This method will sort the array ascending to descending
public static void sortData()
{
Console.WriteLine("The array has been sorted in ascending order");
Array.Sort(myArray);
Console.WriteLine("The array has been sorted in descending order");
Array.Reverse(myArray);
}
//This method will create statistics based on the numbers in the array
public static void createData()
{
//Sum
double sum = myArray.Sum();
Console.WriteLine("The total sum of the array is: " + sum);
//Average
double average = sum / myArray.Length;
Console.WriteLine("The average number of the array is: " + average);
//Maximum
double maximum = myArray.Max();
Console.WriteLine("The maximum value in the array is: " + maximum);
//Minimum
double minimum = myArray.Min();
Console.WriteLine("The minimum value in the array is: " + minimum);
//Mean
double mean = sum / myArray.Length;
Console.WriteLine("The mean average of the array is: " + mean);
}
//This method will exit the program
public static void exitProgram()
{
Environment.Exit(0);
}
}
}
答案 0 :(得分：1)
我的findData（）方法看起来不错吗？
您的findData()方法确实没有任何效果。
这是一种方法
public static void findData()
{
Console.WriteLine("Find a number");
string myChoice = Console.ReadLine();
double number = -1;
if(!Double.TryParse(myChoice, out number))
{
Console.WriteLine("Invalid number");
}
else if (Array.IndexOf<double>(myArray, number) == -1)
{
Console.WriteLine("Number does not exist");
}
else
{
Console.WriteLine("Number does exist");
}
}
答案 1 :(得分：0)
这应解决您的添加问题
public static void addData()
{
for (int i = 0; i < myArray.Length; i++)
{
bool success = false;
while (!success)
{
Console.WriteLine("Enter a number you would like to add");
string input = Console.ReadLine();
double number;
if (Double.TryParse(input, out number))
{
success = true;
myArray[i] = number;
}
else
{
Console.WriteLine("Invalid input. Please enter a valid number")
}
}
}
}
答案 2 :(得分：0)
你的cat *.xml | grep -v '^[$]'方法没有多大意义：首先在数组中插入一个double值，然后检查该值是否为double（当然，因为数组是double类型并且只能包含该类型的值）。
此外，如果用户输入无效，addData可能会抛出异常。但是我看到你明白了使用Convert.ToDouble方法，如果字符串（第一个参数）是有效数字，则返回true。所以你的addData方法应该是这样的：
Double.TryParse要在数组中查找数字，可以使用LINQ Contains扩展方法，该方法非常实用：如果数组包含元素，则返回true，否则返回false：
//This method will add numbers to the array
public static void addData()
{
double number;
for (int i = 0; i < myArray.Length; i++)
{
Console.WriteLine("Enter a number you would like to add");
// read user input
string input = Console.ReadLine();
// condition is true if user input is a number
if (double.TryParse(input, out number))
myArray[i] = number;
else
Console.WriteLine("Invalid input. Please enter a valid number");
}
}