5.29 - Function IsNumber

Objetive

Create a function that tells if a string is an intenger number. It should be used like this:

if (IsNumber ("1234"))
System.Console.WriteLine ("It is a numerical value");


Solution

using System;
public class FunctionIsNumeric
{
public static bool IsNumber(string text)
{
for (int i = 0; i < text.Length; i++)
if (text[i] < '0') || (text[i] > '9')
return false;

return true;
}


public static void Main()
{
Console.WriteLine( IsNumber("12") );
}
}

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