<?php
/*
** History of this class:
** This class was originally a HTML file from -
** http://www.femalenerd.com/javascript/calculator.html
** and I used HTML2php program to convert the HTML file to php program.
** The class 'HTML2php' is also available from -
** http://phpclasses.upperdesign.com/browse.html/author/35463
** To make any changes you must first change the calculator.html file,
** test it and then use HTML2php and change the display() function in
** this class.
**
** USAGE:
//include_once("calculator.php");
require_once("calculator.php");
$calc = new calculator;
$calc->display();
*/
class calculator
{
function display()
{
print("<HTML>\n");
print("<HEAD>\n");
print("<TITLE>JavaScript Calculator</TITLE>\n");
print("<SCRIPT LANGUAGE='JavaScript'>\n");
print("/**************************************\n");
print(" * http://www.femalenerd.com/javascript/calculator.html *\n");
print(" **************************************/\n");
print("\n");
print("// Declare global variables\n");
print("var displayText = \"\"\n");
print("var num1\n");
print("var num2\n");
print("var operatorType\n");
print("\n");
print("// Write to display\n");
print("function addDisplay(n){\n");
print("document.calc.display.value = \"\"\n");
print("displayText += n\n");
print("document.calc.display.value = displayText\n");
print("}\n");
print("\n");
print("// Addition\n");
print("function addNumbers() {\n");
print("if (displayText == \"\") {\n");
print(" displayText = result\n");
print(" }\n");
print("num1 = parseFloat(displayText)\n");
print("operatorType = \"add\"\n");
print("displayText = \"\"\n");
print("}\n");
print("\n");
print("// Subtraction\n");
print("function subtractNumbers() {\n");
print("if (displayText == \"\") {\n");
print(" displayText = result\n");
print(" }\n");
print("num1 = parseFloat(displayText)\n");
print("operatorType = \"subtract\"\n");
print("displayText = \"\"\n");
print("}\n");
print("\n");
print("// Multiplication\n");
print("function multiplyNumbers() {\n");
print("if (displayText == \"\") {\n");
print(" displayText = result\n");
print(" }\n");
print("num1 = parseFloat(displayText)\n");
print("operatorType = \"multiply\"\n");
print("displayText = \"\"\n");
print("}\n");
print("\n");
print("// Division\n");
print("function divideNumbers() {\n");
print("if (displayText == \"\") {\n");
print(" displayText = result\n");
print(" }\n");
print("num1 = parseFloat(displayText)\n");
print("operatorType = \"divide\"\n");
print("displayText = \"\"\n");
print("}\n");
print("\n");
print("// Sine\n");
print("function sin() {\n");
print("if (displayText == \"\") {\n");
print(" num1 = result\n");
print(" }\n");
print("else {\n");
print(" num1 = parseFloat(displayText)\n");
print(" }\n");
print("if (num1 != \"\") {\n");
print(" result = Math.sin(num1)\n");
print(" document.calc.display.value = result\n");
print(" displayText = \"\"\n");
print(" }\n");
print("else {\n");
print(" alert(\"Please write the number first\")\n");
print(" }\n");
print("}\n");
print("\n");
print("// Cosine\n");
print("function cos() {\n");
print("if (displayText == \"\") {\n");
print(" num1 = result\n");
print(" }\n");
print("else {\n");
print(" num1 = parseFloat(displayText)\n");
print(" }\n");
print("if (num1 != \"\") {\n");
print(" result = Math.cos(num1)\n");
print(" document.calc.display.value = result\n");
print(" displayText = \"\"\n");
print(" }\n");
print("else {\n");
print(" alert(\"Please write the number first\")\n");
print(" }\n");
print("}\n");
print("\n");
print("// ArcSine\n");
print("function arcSin() {\n");
print("if (displayText == \"\") {\n");
print(" num1 = result\n");
print(" }\n");
print("else {\n");
print(" num1 = parseFloat(displayText)\n");
print(" }\n");
print("if (num1 != \"\") {\n");
print(" result = Math.asin(num1)\n");
print(" document.calc.display.value = result\n");
print(" displayText = \"\"\n");
print(" }\n");
print("else {\n");
print(" alert(\"Please write the number first\")\n");
print(" }\n");
print("}\n");
print("\n");
print("// ArcCosine\n");
print("function arcCos() {\n");
print("if (displayText == \"\") {\n");
print(" num1 = result\n");
print(" }\n");
print("else {\n");
print(" num1 = parseFloat(displayText)\n");
print(" }\n");
print("if (num1 != \"\") {\n");
print(" result = Math.acos(num1)\n");
print(" document.calc.display.value = result\n");
print(" displayText = \"\"\n");
print(" }\n");
print("else {\n");
print(" alert(\"Please write the number first\")\n");
print(" }\n");
print("}\n");
print("\n");
print("// Square root\n");
print("function sqrt() {\n");
print("if (displayText == \"\") {\n");
print(" num1 = result\n");
print(" }\n");
print("else {\n");
print(" num1 = parseFloat(displayText)\n");
print(" }\n");
print("if (num1 != \"\") {\n");
print(" result = Math.sqrt(num1)\n");
print(" document.calc.display.value = result\n");
print(" displayText = \"\"\n");
print(" }\n");
print("else {\n");
print(" alert(\"Please write the number first\")\n");
print(" }\n");
print("}\n");
print("\n");
print("// Square number (number to the power of two)\n");
print("function square() {\n");
print("if (displayText == \"\") {\n");
print(" num1 = result\n");
print(" }\n");
print("else {\n");
print(" num1 = parseFloat(displayText)\n");
print(" }\n");
print("if (num1 != \"\") {\n");
print(" result = num1 * num1\n");
print(" document.calc.display.value = result\n");
print(" displayText = \"\"\n");
print(" }\n");
print("else {\n");
print(" alert(\"Please write the number first\")\n");
print(" }\n");
print("}\n");
print("\n");
print("// Convert degrees to radians\n");
print("function degToRad() {\n");
print("if (displayText == \"\") {\n");
print(" num1 = result\n");
print(" }\n");
print("else {\n");
print(" num1 = parseFloat(displayText)\n");
print(" }\n");
print("if (num1 != \"\") {\n");
print(" result = num1 * Math.PI / 180\n");
print(" document.calc.display.value = result\n");
print(" displayText = \"\"\n");
print(" }\n");
print("else {\n");
print(" alert(\"Please write the number first\")\n");
print(" }\n");
print("}\n");
print("\n");
print("// Convert radians to degrees\n");
print("function radToDeg() {\n");
print("if (displayText == \"\") {\n");
print(" num1 = result\n");
print(" }\n");
print("else {\n");
print(" num1 = parseFloat(displayText)\n");
print(" }\n");
print("if (num1 != \"\") {\n");
print(" result = num1 * 180 / Math.PI\n");
print(" document.calc.display.value = result\n");
print(" displayText = \"\"\n");
print(" }\n");
print("else {\n");
print(" alert(\"Please write the number first\")\n");
print(" }\n");
print("}\n");
print("\n");
print("// Calculations\n");
print("function calculate() {\n");
print("if (displayText != \"\") {\n");
print(" num2 = parseFloat(displayText)\n");
print("// Calc: Addition\n");
print(" if (operatorType == \"add\") {\n");
print(" result = num1 + num2\n");
print(" document.calc.display.value = result\n");
print(" }\n");
print("// Calc: Subtraction\n");
print(" if (operatorType == \"subtract\") {\n");
print(" result = num1 - num2\n");
print(" document.calc.display.value = result\n");
print(" }\n");
print("// Calc: Multiplication\n");
print(" if (operatorType == \"multiply\") {\n");
print(" result = num1 * num2\n");
print(" document.calc.display.value = result\n");
print(" }\n");
print("// Calc: Division\n");
print(" if (operatorType == \"divide\") {\n");
print(" result = num1 / num2\n");
print(" document.calc.display.value = result\n");
print(" }\n");
print(" displayText = \"\"\n");
print(" }\n");
print(" else {\n");
print(" document.calc.display.value = \"Oops! Error!\"\n");
print(" }\n");
print("}\n");
print("\n");
print("// Clear the display\n");
print("function clearDisplay() {\n");
print("displayText = \"\"\n");
print("document.calc.display.value = \"\"\n");
print("}\n");
print("</SCRIPT>\n");
print("</HEAD>\n");
print("<BODY BGCOLOR=\"#FFFFFF\" LINK=\"#9C6060\">\n");
print("\n");
print("<TABLE>\n");
print("<TD> \n");
print("<TABLE BORDER=0 BGCOLOR=\"#AF9999\">\n");
print("<TD>\n");
print("<TABLE border=\"0\" cellpadding=\"2\" cellspacing=\"2\">\n");
print("<FORM NAME=calc>\n");
print("\n");
print("<!--\n");
print("<TR><TD VALIGN=top colspan=6 ALIGN=\"center\"> <H2>Calculator</H2>
</TD>\n");
print("-->\n");
print("<TR>\n");
print(" <TD COLSPAN=5><INPUT TYPE=text SIZE=22 NAME=display></TD>\n");
print("<TR align=\"left\" valign=\"middle\">\n");
print(" <TD><INPUT TYPE=button NAME=\"one\" VALUE=\" 1 \"
onClick=addDisplay(1)></TD>\n");
print(" <TD><INPUT TYPE=button NAME=\"two\" VALUE=\" 2 \"
onClick=addDisplay(2)></TD>\n");
print(" <TD><INPUT TYPE=button NAME=\"three\" VALUE=\" 3 \"
onClick=addDisplay(3)></TD>\n");
print(" <TD><INPUT TYPE=button NAME=\"plus\" VALUE=\" + \"
onClick=addNumbers()></TD>\n");
print("<TR align=\"left\" valign=\"middle\">\n");
print(" <TD><INPUT TYPE=button NAME=\"four\" VALUE=\" 4 \"
onClick=addDisplay(4)></TD>\n");
print(" <TD><INPUT TYPE=button NAME=\"five\" VALUE=\" 5 \"
onClick=addDisplay(5)></TD>\n");
print(" <TD><INPUT TYPE=button NAME=\"six\" VALUE=\" 6 \"
onClick=addDisplay(6)></TD>\n");
print(" <TD><INPUT TYPE=button NAME=\"minus\" VALUE=\" - \"
onClick=subtractNumbers()></TD>\n");
print("<TR align=\"left\" valign=\"middle\">\n");
print(" <TD><INPUT TYPE=button NAME=\"seven\" VALUE=\" 7 \"
onClick=addDisplay(7)></TD>\n");
print(" <TD><INPUT TYPE=button NAME=\"eight\" VALUE=\" 8 \"
onClick=addDisplay(8)></TD>\n");
print(" <TD><INPUT TYPE=button NAME=\"nine\" VALUE=\" 9 \"
onClick=addDisplay(9)></TD>\n");
print(" <TD><INPUT TYPE=button NAME=\"multiplication\" VALUE=\" * \"
onClick=multiplyNumbers()></TD>\n");
print("<TR align=\"left\" valign=\"middle\">\n");
print(" <TD><INPUT TYPE=button NAME=\"zero\" VALUE=\" 0 \"
onClick=addDisplay(0)></TD>\n");
print(" <TD><INPUT TYPE=button NAME=\"pi\" VALUE = \" Pi \"
onClick=addDisplay(Math.PI)> </TD> \n");
print(" <TD><INPUT TYPE=button NAME=\"dot\" VALUE=\" . \"
onClick=addDisplay(\".\")></TD>\n");
print(" <TD><INPUT TYPE=button NAME=\"division\" VALUE=\" / \"
onClick=divideNumbers()></TD>\n");
print("<TR align=\"left\" valign=\"middle\">\n");
print(" <TD><INPUT TYPE=button NAME=\"sqareroot\" VALUE=\"sqrt\"
onClick=sqrt()></TD>\n");
print(" <TD><INPUT TYPE=button NAME=\"squarex\" VALUE=\" x^2\"
onClick=square()></TD>\n");
print(" <TD><INPUT TYPE=button NAME=\"deg-rad\" VALUE=\"d2r \"
onClick=degToRad()></TD>\n");
print(" <TD><INPUT TYPE=button NAME=\"rad-deg\" VALUE=\"r2d \"
onClick=radToDeg()></TD>\n");
print("<TR align=\"left\" valign=\"middle\">\n");
print(" <TD><INPUT TYPE=button NAME=\"sine\" VALUE=\" sin \"
onClick=sin()></TD>\n");
print(" <TD><INPUT TYPE=button NAME=\"arcsine\" VALUE=\"asin\"
onClick=arcSin()></TD>\n");
print(" <TD><INPUT TYPE=button NAME=\"cosine\" VALUE=\"cos\"
onClick=cos()></TD>\n");
print(" <TD><INPUT TYPE=button NAME=\"arccosine\" VALUE=\"acs\"
onClick=arcCos()></TD>\n");
print("\n");
print("<TR align=\"left\" valign=\"middle\">\n");
print(" <TD COLSPAN=2><INPUT TYPE=button NAME=clear VALUE=\" Clear \"
onClick=clearDisplay()></TD>\n");
print(" <TD COLSPAN=3><INPUT TYPE=button NAME=enter VALUE=\" = \"
onClick=calculate()></TD>\n");
print("\n");
print("</TABLE>\n");
print(" <!--\n");
print(" <TD VALIGN=top> \n");
print(" <B>NOTE:</B> All sine and cosine calculations are\n");
print(" <br>done in radians. Remember to convert first\n");
print(" <br>if using degrees.\n");
print(" </TD>\n");
print(" -->\n");
print(" \n");
print("</TABLE>\n");
print("\n");
print("\n");
print("</TABLE>\n");
print("</BODY>\n");
print("</HTML>\n");
}
}
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