Aestiva H2O Web Site

Installation:
  Free Downloads
  The H2O Family
  Install Notes

Programming:
  Prerequisites
  H2O Whitepaper
  Online Manual
  Code Examples
  H2O Free Support

What's H2O?
H2O is programming made for the web.

What's it like?
H2O is English-like. If you know some Perl, VB, ASP, or PhP you'll be immediately productive in H2O. It runs on Linux, Mac, Unix, and Windows.

How do I try it?
Download H2O for free. Get it from hosting providers. Or buy on-line.

Where does H2O come from?
The language was invented by Aestiva. H2O stands for:
   HTML with
   HTML/OS
   Overlays.

Calculator

A simple calculator. A good place to start if you're building a special-purpose calculator.

calculator.html


<html>
<title>Calculator</title>
<body bgcolor=white>

<<
IF Calc.Num1 = "ERROR" THEN 
    Calc.Num1 = "0"  Calc.Num2 = "0" Calc.Total = "0" 
/IF
>>
<br><br>
<form method=post action=CALCULATE>
<center>
<table border=1 cellpadding=15 cellspacing=0><tr>
<td bgcolor=lightblue align=center>
<font size=4 color=red><b>CALCULATOR</b></font><br>

<font size=2><b>Select Operation &amp;
 Click Calculate</b></font></td></tr>
<tr><td>
<table border=0>
<tr><td align=left valign=top>

<input type=submit name=Calc.MyButton value="CLEAR">
<br><br></td></tr>
<tr><td>&nbsp;</td><td><input type=text size=7 name=Calc.Num1></td></tr>

<tr><td><select name=Calc.Op size=1>
<option value="+"> +
<option value="-"> -
<option value="/"> /
<option value="*"> *

</select></td>
<td><input type=text size=7 name=Calc.Num2></td></tr>
<tr><td>
<input type=submit name=Calc.MyButton value="Calculate>">

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td>
<td><font color=darkred><b>&nbsp;<<Calc.Total>></b></font></td></tr>

</table>
</td></tr></table>
</center>
</html>
<<OVERLAY calculate
  IF Calc.MyButton="CLEAR" THEN
    Calc.Num1="0" Calc.Num2="0" Calc.Total="0" Calc.Op="+"
    GOTO "calculator.html"
  /IF
  IF Calc.Op = "+"  THEN 
    Calc.Total = Calc.Num1 + Calc.Num2  
  ELIF Calc.Op = "-"  THEN 
    Calc.Total = Calc.Num1 - Calc.Num2  
  ELIF Calc.Op = "*"  THEN 
    Calc.Total = Calc.Num1 * Calc.Num2  
  ELIF Calc.Op = "/"  THEN 
    Calc.Total = Calc.Num1 / Calc.Num2  
  /IF
  GOTO "calculator.html"
>>