Month: February 2011

Use Integer.Parse to check: is it a number

Posted on by coder
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using System;
using System.Data;
using System.Text.RegularExpressions;

class Class1{
        static void Main(string[] args){
      string IsNotNum = "111west";
      string IsNum = "  +111  ";
      string IsFloat = "  23.11  ";
      string IsExp = "  +23 e+11  ";
      
      Console.WriteLine(IsIntegerRegEx(IsNum));    // True
      Console.WriteLine(IsIntegerRegEx(IsNotNum));  // False
      Console.WriteLine(IsIntegerRegEx(IsFloat));    // False
      Console.WriteLine(IsIntegerRegEx(IsExp));    // False
        }
    public static bool IsIntegerRegEx(string str)
    {
      str = str.Trim();
      return (Regex.IsMatch(str, @"^[+-]?d+$"));
    }

}

Use int.Parse to check: is it an integer

Posted on by coder
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using System;
using System.Data;


class Class1{
        static void Main(string[] args){
      string IsNotNum = "111west";
      string IsNum = "  +111  ";
      string IsFloat = "  23.11  ";
      string IsExp = "  +23 e+11  ";
      
      Console.WriteLine(IsNumeric(IsNum));    // True
      Console.WriteLine(IsNumeric(IsNotNum));    // False
      Console.WriteLine(IsNumeric(IsFloat));    // False
      Console.WriteLine(IsNumeric(IsExp));    // False
      Console.WriteLine();

        }
    public static bool IsNumeric(string str)
    {
      try
      {
        str = str.Trim();
        int foo = int.Parse(str);
        return (true);
      }
      catch (FormatException e)
      {
        Console.WriteLine("Not a numeric value: {0}", e.ToString());
        return (false);
      }
    }
}

Use regualr expression to check: is it a number

Posted on by coder
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using System;
using System.Data;
using System.Text.RegularExpressions;

class Class1{
        static void Main(string[] args){
      string IsNotNum = "111west";
      string IsNum = "  +111  ";
      string IsFloat = "  23.11  ";
      string IsExp = "  +23 e+11  ";
      
      Console.WriteLine(IsNumericRegEx(IsNum));    // True
      Console.WriteLine(IsNumericRegEx(IsNotNum));  // False
      Console.WriteLine(IsNumericRegEx(IsFloat));    // True
      Console.WriteLine(IsNumericRegEx(IsExp));    // False
        }
    public static bool IsNumericRegEx(string str)
    {
      str = str.Trim();
      return (Regex.IsMatch(str, @"^[+-]?d*.?[Ee]?[+-]?d*$"));
    }    
}

Determining if a String is a Valid Number by Parse functions

Posted on by coder
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using System;
using System.Data;


class Class1{
        static void Main(string[] args){
      string IsNotNum = "111west";
      string IsNum = "  +111  ";
      string IsFloat = "  23.11  ";
      string IsExp = "  +23 e+11  ";
      
      Console.WriteLine(int.Parse(IsNum));    
        Console.WriteLine(float.Parse(IsNum));    // 111
      Console.WriteLine(float.Parse(IsFloat));  // 23.11
      //Console.WriteLine(float.Parse(IsExp));  // throws
      
      try
      {
        Console.WriteLine(int.Parse(IsNotNum));
      }
      catch (FormatException e)
      {
        Console.WriteLine("Not a numeric value: {0}", e.ToString());  // throws
      }

        }
}

Converting a Number in Another Base to Base10

Posted on by coder
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using System;
using System.Data;


class Class1{
        static void Main(string[] args){
      string base2 = "111";
      string base8 = "117";
      string base10 = "1110";
      string base16 = "11F1FF";

      Console.WriteLine("Convert.ToInt32(base2, 2) = " + 
        Convert.ToInt32(base2, 2));

      Console.WriteLine("Convert.ToInt32(base8, 8) = " + 
        Convert.ToInt32(base8, 8));

      Console.WriteLine("Convert.ToInt32(base10, 10) = " + 
        Convert.ToInt32(base10, 10));

      Console.WriteLine("Convert.ToInt32(base16, 16) = " + 
        Convert.ToInt32(base16, 16));
        }
}

Converting Radians to Degrees

Posted on by coder
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using System;
using System.Data;


class Class1{
        static void Main(string[] args){
            Console.WriteLine(ConvertRadiansToDegrees (2));

            Console.WriteLine(ConvertRadiansToDegrees (3.1415));

            Console.WriteLine(ConvertRadiansToDegrees (0));

        }
    public static double ConvertRadiansToDegrees(double radians)
    {
      double degrees = (180 / Math.PI) * radians;
      return (degrees);
    }
}

Converting Radians to Degrees

Posted on by coder
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using System;
using System.Data;


class Class1{
        static void Main(string[] args){
            Console.WriteLine(ConvertRadiansToDegrees (2));

            Console.WriteLine(ConvertRadiansToDegrees (3.1415));

            Console.WriteLine(ConvertRadiansToDegrees (0));

        }
    public static double ConvertRadiansToDegrees(double radians)
    {
      double degrees = (180 / Math.PI) * radians;
      return (degrees);
    }
}