<script language=javascript> //<!-- var NDIGITS = 16; var STACKSIZE = 12; var value = 0; // current value in display var memory = GetCookie("CalcMemory"); // current value in memory if (!memory) memory = 0; var level = 0; // no. of items on stack var entered = true; // has value on display been 'entered'? var decimal = 0; // multiplier when entering after decimal point var fixed = 0; // force trailing zero display when entering decimals var exponent = false; // currently entering exponent? var inverse = false; // has the INV key been pressed? if (location.search) { // pass in value through command line value = location.search.substring(1,location.search.length); } function stackItem() { this.value = 0; this.op = ""; } function array(length) { this[0] = 0; for (i=0; i<length; ++i) { this[i] = 0; this[i] = new stackItem(); } this.length = length; } stack = new array(STACKSIZE); function push(value,op,prec) { if (level==STACKSIZE) return false; for (i=level;i>0; --i) { stack[i].value = stack[i-1].value; stack[i].op = stack[i-1].op; stack[i].prec = stack[i-1].prec; } stack[0].value = value; stack[0].op = op; stack[0].prec = prec; ++level; return true; } function pop() { if (level==0) return false; for (i=0;i<level; ++i) { stack[i].value = stack[i+1].value; stack[i].op = stack[i+1].op; stack[i].prec = stack[i+1].prec; } --level; return true; } function format(value) { var valStr = "" + value; if (valStr.indexOf("N")>=0 || (value == 2*value && value == 1+value)) return "Error "; var i = valStr.indexOf("e") if (i>=0) { var expStr = valStr.substring(i+1,valStr.length); if (i>11) i=11; // max 11 digits valStr = valStr.substring(0,i); if (valStr.indexOf(".")<0) valStr += "."; valStr += " " + expStr; } else { var valNeg = false; if (value < 0) { value = -value; valNeg = true; } var valInt = Math.floor(value); var valFrac = value - valInt; var prec = NDIGITS - (""+valInt).length - 1; // how many digits available after period if (! entered && fixed>0) prec = fixed; var mult = " 1000000000000000000".substring(1,prec+2); var frac = Math.floor(valFrac * mult + 0.5); valInt = Math.floor(Math.floor(value * mult + .5) / mult); if (valNeg) valStr = "-" + valInt; else valStr = "" + valInt; var fracStr = "00000000000000"+frac; fracStr = fracStr.substring(fracStr.length-prec, fracStr.length); i = fracStr.length-1; if (entered || fixed==0) { // remove trailing zeros unless fixed during entry. while (i>=0 && fracStr.charAt(i)=="0") --i; fracStr = fracStr.substring(0,i+1); } if (i>=0) valStr += "." + fracStr; // document.result.debugField.value = "prec "+prec+", mult "+mult+", frac "+frac; } return valStr; } function refresh() { var display = format(value); if (exponent) { if (expval<0) display += " " + expval; else display += " +" + expval; } if (display.indexOf(".")<0 && display != "Error ") { if (entered || decimal>0) display += '.'; else display += ' '; } display = " " + display; display = display.substring(display.length-NDIGITS-1,display.length); document.result.result.value = display; inverse = false; } function clearAll() { level = 0; clear(); } function clear() { exponent = false; value = 0; enter(); refresh(); } function evalx() { if (level==0) return false; op = stack[0].op; sval = stack[0].value; // alert("eval "+sval+op+value); if (op == '+') value = parseFloat(sval) + value; else if (op == '-') value = sval - value; else if (op == '*') value = sval * value; else if (op == '/') value = sval / value; else if (op == 'pow') value = Math.pow(sval,value); pop(); if (op=='(') return false; return true; } function openp() { enter(); if (!push(0,'(',0)) { value = "NAN"; } refresh(); } function closep() { enter(); while (evalx()) ; refresh(); } function operator(op) { enter(); if (op=='+' || op=='-') prec = 1; else if (op=='*' || op=='/') prec = 2; else if (op=="pow") prec = 3; if (level>0 && prec <= stack[0].prec) evalx(); if (!push(value,op,prec)) { value = "NAN"; } refresh(); } function enter() { if (exponent) value = value * Math.exp(expval * Math.LN10); entered = true; exponent = false; decimal = 0; fixed = 0; } function equals() { enter() while (level>0) evalx(); refresh(); } function digit(n) { if (entered) { value = 0; digits = 0; entered = false; } if (n==0 && digits==0) { refresh(); return; } if (exponent) { if (expval<0) n = -n; if (digits < 3) { expval = expval * 10 + n; ++digits; refresh(); } return; } if (value<0) n = -n; if (digits < NDIGITS-1) { ++digits; if (decimal>0) { decimal = decimal * 10; value = value + (n/decimal); ++fixed; } else value = value * 10 + n; } refresh(); } function sign() { if (exponent) expval = -expval; else value = -value; refresh(); } function period() { if (entered) { value = 0; digits = 1; } entered = false; if (decimal == 0) { decimal = 1; } refresh(); } function exp() { if (entered || exponent) return; exponent = true; expval = 0; digits = 0; decimal = 0; refresh(); } function inv() { inverse = !inverse; } function func(f) { enter(); if (f=="1/x") value = 1/value; else if (f=="swap") { var tmp = value; value = stack[0].value; stack[0].value = tmp; } else if (f=='n!') { if (value<0 || value>200 || value != Math.round(value)) value = "NAN"; else { var n = 1; var i; for (i=1;i<=value;++i) n *= i; value = n; } } else if (f=="MR") value = memory; else if (f=="M+") { memory += value; SetCookie("CalcMemory", memory); } else if (f=="Min") { memory = value; SetCookie("CalcMemory", memory); } else if (inverse) { if (f=="sin") value = Math.asin(value)*180/Math.PI; else if (f=="cos") value = Math.acos(value)*180/Math.PI; else if (f=="tan") value = Math.atan(value)*180/Math.PI; else if (f=="log") value = Math.exp(value * Math.LN10); else if (f=="log2") value = Math.exp(value * Math.LN2); else if (f=="ln") value = Math.exp(value); else if (f=="sqrt") value = value*value; else if (f=="pi") value = Math.E; } else { if (f=="sin") value = Math.sin(value/180 * Math.PI); else if (f=="cos") value = Math.cos(value/180 * Math.PI); else if (f=="tan") value = Math.tan(value/180 * Math.PI); else if (f=="log") value = Math.log(value)/Math.LN10; else if (f=="log2") value = Math.log(value)/Math.LN2; else if (f=="ln") value = Math.log(value); else if (f=="sqrt") value = Math.sqrt(value); else if (f=="pi") value = Math.PI; } refresh(); } function hex() { location = "hcalc.html?"+value; } ///////////// // // Cookie Functions - Second Helping (21-Jan-96) // Written by: Bill Dortch, hIdaho Design <bdortch@netw.com> // The following functions are released to the public domain. // function getCookieVal (offset) { var endstr = document.cookie.indexOf (";", offset); if (endstr == -1) endstr = document.cookie.length; return unescape(document.cookie.substring(offset, endstr)); } function GetCookie (name) { var arg = name + "="; var alen = arg.length; var clen = document.cookie.length; var i = 0; while (i < clen) { var j = i + alen; if (document.cookie.substring(i, j) == arg) return getCookieVal (j); i = document.cookie.indexOf(" ", i) + 1; if (i == 0) break; } return null; } // function SetCookie (name, value) { var argv = SetCookie.arguments; var argc = SetCookie.arguments.length; var expires = (argc > 2) ? argv[2] : null; var path = (argc > 3) ? argv[3] : null; var domain = (argc > 4) ? argv[4] : null; var secure = (argc > 5) ? argv[5] : false; document.cookie = name + "=" + escape (value) + ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) + ((path == null) ? "" : ("; path=" + path)) + ((domain == null) ? "" : ("; domain=" + domain)) + ((secure == true) ? "; secure" : ""); } function DeleteCookie (name) { var exp = new Date(); exp.setTime (exp.getTime() - 1); // This cookie is history var cval = GetCookie (name); document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString(); } // // End of cookie functions ////////// // --> </script>

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