c#.如何计数从输入输入的数字

本文关键字：输入 数字 何计数 | 更新日期: 2023-09-27 18:12:16

这是一个乘数代码，用户输入。

string x;
double t, s = 1;
Console.WriteLine("Enter some numbers: ");
Console.WriteLine("To finish, press Enter");
while ((x = Console.ReadLine()) != "")
{
    t = Convert.ToDouble(x);
    s *= t;
}
Console.WriteLine("The result is: {0}", s);
Console.ReadLine();

它在最后显示结果，但是如何使它显示输入数字的总数?例如:我输入1、2和3。所以总数是3

c#.如何计数从输入输入的数字

string x;
double t, s = 1;
int count = 0;
Console.WriteLine("Enter some numbers: ");
Console.WriteLine("To finish, press Enter");
while ((x = Console.ReadLine()) != "")
{
    t = Convert.ToDouble(x);
    s *= t;
    count++;
}
Console.WriteLine("The result is: {0}", s);
Console.WriteLine("The count is: {0}", count);
Console.ReadLine();
  1. 最好使用TryParse来避免FormatException
  2. 字符。IsDigit返回true，当前字符是数字(显然)

的例子:

string x;   
double t, s = 1;    
int digitCount = 0;
Console.WriteLine("Enter some numbers: ");
Console.WriteLine("To finish, press Enter");
while ((x = Console.ReadLine()) != "")
{
    if (!Double.TryParse(x, out t))
        continue;
    foreach (var c in x)
        if (Char.IsDigit(c))
            digitCount++;
    s *= t;
}   
Console.WriteLine("The result is: {0}", s);  
Console.WriteLine("The count of digits is: {0}", digitCount);    
Console.ReadLine();

为什么不为counter设置一个变量呢?

    Console.WriteLine("Enter some numbers: ");
    Console.WriteLine("To finish, press Enter");
    int i=0;
    while ((x = Console.ReadLine()) != "")
    {
        i++;
        t = Convert.ToDouble(x);
        s *= t;
    }
    Console.WriteLine("The result is: {0}", s);
    Console.ReadLine();

你必须为使用计数器变量的循环迭代计数:

int loopCounter=0;
while ((x = Console.ReadLine()) != "")
{
    t = Convert.ToDouble(x);
    s *= t;
    loopCounter++;
}
Console.WriteLine("The count is: {0}", loopCounter);

您可以尝试计算字符串输入(x)中的字符数。int temp = x.Length ();

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