public class Functions
{
public static long Factorial(int n)
{
if (n < 0) { return -1; } //error result - undefined
if (n > 256) { return -2; } //error result - input is too big if (n == 0) { return 1; } // Calculate the factorial iteratively rather than recursively: long tempResult = 1;
for (int i = 1; i <= n; i++)
{
tempResult *= i;
}
return tempResult;
}
}
class MainClass
{
static int Main(string[] args)
{
// Test if input arguments were supplied:
if (args.Length == 0)
{
System.Console.WriteLine("Please enter a numeric argument.");
System.Console.WriteLine("Usage: Factorial <num>");
return 1;
} try
{
// Convert the input arguments to numbers:
int num = int.Parse(args[0]); System.Console.WriteLine("The Factorial of {0} is {1}.", num, Functions.Factorial(num));
return 0;
}
catch (System.FormatException)
{
System.Console.WriteLine("Please enter a numeric argument.");
System.Console.WriteLine("Usage: Factorial <num>");
return 1;
}
}
}如题,我在MSDN上找到的这个例子,但是怎么弄输出都是“Please enter a numeric argument.”到底如何能正常显示。我对命令行的参数的概念也不是了解的很透彻。
第一次发问,希望大家指点下~分儿比较少,不过尝到甜头,我以后多多充分儿!
{
public static long Factorial(int n)
{
if (n < 0) { return -1; } //error result - undefined
if (n > 256) { return -2; } //error result - input is too big if (n == 0) { return 1; } // Calculate the factorial iteratively rather than recursively: long tempResult = 1;
for (int i = 1; i <= n; i++)
{
tempResult *= i;
}
return tempResult;
}
}
class MainClass
{
static int Main(string[] args)
{
// Test if input arguments were supplied:
if (args.Length == 0)
{
System.Console.WriteLine("Please enter a numeric argument.");
System.Console.WriteLine("Usage: Factorial <num>");
return 1;
} try
{
// Convert the input arguments to numbers:
int num = int.Parse(args[0]); System.Console.WriteLine("The Factorial of {0} is {1}.", num, Functions.Factorial(num));
return 0;
}
catch (System.FormatException)
{
System.Console.WriteLine("Please enter a numeric argument.");
System.Console.WriteLine("Usage: Factorial <num>");
return 1;
}
}
}如题,我在MSDN上找到的这个例子,但是怎么弄输出都是“Please enter a numeric argument.”到底如何能正常显示。我对命令行的参数的概念也不是了解的很透彻。
第一次发问,希望大家指点下~分儿比较少,不过尝到甜头,我以后多多充分儿!
System.Console.WriteLine("Please enter a numeric argument."); 的啊
那给出的实例上,怎么输入命令行丫?去哪儿输入丫?
运行示例 #1:
输入下面的命令行:Factorial 10 您将获得下面的结果:The Factorial of 10 is 3628800. 运行示例 #2:
输入下面的命令行:Factorial 您将获得下面的结果:Please enter a numeric argument. Usage: Factorial <num>
谢谢您~我的分儿太少了,看了我得去多充点分儿顺便问句我怎么给您分儿而啊
cmd
cd /D 程序目录\bin\debug
Factorial 10