C＃。如何计算从输入中输入的数字？

Question

这是一个数字相乘的代码，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();

结果显示在最后，但是如何让它显示输入的数字总数？例如：我输入 1、2 和 3。所以总计数为 3。

Answer 1

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();

Answer 2

为什么不是计数器的变量？

    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();

Answer 3

您必须计算使用计数器变量的循环迭代次数：

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

Answer 4

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

Answer 5

最好用TryParse避免FormatException
Char.IsDigit returns true 是当前字符是数字（显然）

示例：

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();

C＃。如何计算从输入中输入的数字？

C#. How to count digits entered from input?

c#

input

count

digits