Return Values
Visual Studio .NET 2003
The Main method can be of the type void:
static void Main()
{
}
It can also return an int:
static int Main()
{
return 0;
}
Example
In this example, the program contains two classes, Factorial and MainClass. The Main method, which resides in the MainClass class, is used to read a number from the keyboard, invoke the Fac method from the Factorial class, and calculate and display the factorial of the input number.
// cs_main.cs
using System;
public class Factorial
{
public static long Fac(long i)
{
return ((i <= 1) ? 1 : (i * Fac(i-1)));
}
}
class MainClass
{
public static void Main()
{
// Read a string from the keyboard:
Console.Write("Enter an integer: ");
string s = Console.ReadLine();
// Convert the string to long:
try
{
long num = Int64.Parse(s);
Console.WriteLine("The Factorial of {0} is {1}.",
num, Factorial.Fac(num));
}
catch (System.FormatException)
{
Console.WriteLine("Invalid input specified");
}
}
}
Input
5
Sample Output
Enter an integer: 5 The Factorial of 5 is 120.
