Every time someone types in a decimal or any characters or strings, I want a message box shown saying “only integers”.
16329
I have a windows forms app with a textbox control that I want to only accept integer values. In the past I've done this kind of validation by overloading the KeyPress event and just removing characters which didn't fit the specification. I've looked at the MaskedTextBox control but I'd like a more general solution that could work with perhaps a regular expression, or depend on the values of other controls.  Ideally this would behave such that pressing a non numeric character would either produce no result or immediately provide the user with feedback about the invalid character.
119341
I'm pretty new to programming and made a few programs so far. I recently made a Calculator program and I hope you guys could tell me what I could do to improve. int firstNumber; string sign; int secondNumber; int answer;  Console.WriteLine(&quot;Input Number:&quot;); firstNumber = Convert.ToInt32(Console.ReadLine()); Console.Clear();  Console.WriteLine(&quot;Input Sign:&quot;); sign = Console.ReadLine(); Console.Clear();  Console.WriteLine(&quot;Input Second Number:&quot;); secondNumber = Convert.ToInt32(Console.ReadLine()); Console.Clear();  switch (sign) {     case &quot;+&quot;:         answer = firstNumber + secondNumber;         Console.WriteLine(answer);         Console.ReadKey();     break;     case &quot;-&quot;:         answer = firstNumber - secondNumber;         Console.WriteLine(answer);         Console.ReadKey();     break;     case &quot;*&quot;:         answer = firstNumber * secondNumber;         Console.WriteLine(answer);         Console.ReadKey();     break;     case &quot;/&quot;:         answer = firstNumber / secondNumber;         Console.WriteLine(answer);         Console.ReadKey();     break;     default:         Console.WriteLine(&quot;Invalid Input&quot;);     break; }
41641
What is the most efficient way of testing an input string whether it contains a numeric value (or conversely Not A Number)? I guess I can use Double.Parse or a regex (see below) but I was wondering if there is some built in way to do this, such as javascript's NaN() or IsNumeric() (was that VB, I can't remember?).  public static bool IsNumeric(this string value) {     return Regex.IsMatch(value, "^\\d+$"); }
6769
In PHP, is there an easy way to convert a number to a word? For instance, 27 to twenty-seven.
2156
In Java is there a way to check the condition:  "Does this single character appear at all in string x"  without using a loop?
58125
I am trying to create a command that the user can enter keys for values. How can I create one, for example:   \myparbox[width=50,height=10,color=blue, align=left -10px]{}
45274
I would like to label an equation with an arbitrary symbol, rather than a number, or letter.  Is this possible?
85947
How do you write a number with two decimal places for sql server?
61962
How do you impose a character limit on a text input in HTML?
92147
typeof(int).Name   Will return System.Int32 does anyone know of a way to return "int"
19825
But here's an example:  Dim desiredType as Type if IsNumeric(desiredType) then ...   EDIT: I only know the Type, not the Value as a string.  Ok, so unfortunately I have to cycle through the TypeCode.  But this is a nice way to do it:   if ((desiredType.IsArray))       return 0;   switch (Type.GetTypeCode(desiredType))  {       case 3:       case 6:       case 7:       case 9:       case 11:       case 13:       case 14:       case 15:           return 1;  }  ;return 0;
97498
In crontab, I can use an asterisk to mean every value, or "*/2" to mean every even value.  Is there a way to specify every odd value? (Would something like "1+*/2" work?)
113341
How to show the message "hello $username, today's date is $date" as soon as you login to Ubuntu.
58099
I would like to have a regular expression that checks if a string contains only upper and lowercase letters, numbers, and underscores.
271
How do you left pad an int with zeros when converting to a String in java?  I'm basically looking to pad out integers up to 9999 with leading zeros (e.g. 1 = 0001).
46742
Is there a library or a class/function that I can use to convert an integer to it's verbal representation?  Example input:     4,567,788`   Example output:     Four million, Five hundred sixty-seven thousand, seven hundred eighty-eight
10097
Does Java have a built-in way to escape arbitrary text so that it can be included in a regular expression? For example, if my users enter "$5", I'd like to match that exactly rather than a "5" after the end of input.