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buffer = 0;
counter = 0;
decimal=0;
textString= 0;
initnumval = 0;
isdec = 0;
fnct=0; // the function last performed
currentbase = new Number(10);
// initialize the text box
document.calculator.textbox.value = 0;
function binaryfns(fn) {
// these can only be done if we are in base 10
if (currentbase == 10) {
visnum = document.calculator.textbox.value;
if (fn == 1) {
document.calculator.textbox.value = ~visnum;
}
} else {
workbase = currentbase;
convertToBaseTen(currentbase);
visnum = document.calculator.textbox.value;
if (fn == 1) {
document.calculator.textbox.value = Math.abs(~visnum);
}
convertFromBaseTen(currentbase);
}
}
// this performs the rest of the functions that we may want to add
function dofunction (fn) {
// these can only be done if we are in base 10
if (currentbase == 10) {
visnum = document.calculator.textbox.value;
switch ( fn ) {
case 1:
document.calculator.textbox.value = Math.sqrt(visnum);
break;
case 2:
document.calculator.textbox.value = 1/visnum;
break;
case 3:
document.calculator.textbox.value = (-1) * visnum;
break;
case 4:
document.calculator.textbox.value = Math.exp(visnum);
break;
case 5:
document.calculator.textbox.value = Math.sin(visnum);
break;
case 6:
document.calculator.textbox.value = Math.cos(visnum);
break;
case 7:
document.calculator.textbox.value = Math.tan(visnum);
break;
case 8:
document.calculator.textbox.value = Math.log(visnum);
break;
case 9:
document.calculator.textbox.value = Math.PI;
break;
case 10:
lcnum = visnum;
while (visnum > 1) {
visnum--;
lcnum = lcnum * visnum;
}
document.calculator.textbox.value = lcnum;
break;
case 11:
if (isdec == 1) {
if (visnum >= 0) {
document.calculator.textbox.value = Math.floor(visnum);
} else {
document.calculator.textbox.value = Math.ceil(visnum);
}
} else {
document.calculator.textbox.value = visnum;
}
break;
case 12:
document.calculator.textbox.value = Math.LOG10E;
break;
case 13:
document.calculator.textbox.value = visnum*visnum;
break;
case 14:
document.calculator.textbox.value = visnum*visnum*visnum;
break;
}
}
}
// this function does the add subtract or multiply or divide and modulus as
// well as x to the power y
// consider this a private funtion of sorts
// only multiplication and addition work on none base 10
function getanswer(quant, varble) {
initnumval = document.calculator.textbox.value;
document.calculator.textbox.value = 0;
switch ( quant ) {
// because javascript can possible eval x+y to xy instead of a value
// we make x+y = x-(-y) which is logically equivalent
case 1:
return ((new Number(varble)) + (new Number(initnumval)));
case 2:
return varble - initnumval;
case 3:
return varble * initnumval;
case 4:
return (varble / initnumval);
case 6:
return (Math.pow(varble, initnumval));
case 7:
return (varble% initnumval);
}
if (currentbase == 2) {
varble = convertDataToBaseTen(2, varble);
initnumval = convertDataToBaseTen(2, initnumval);
if (quant==8) {
value = (varble & initnumval);
}
if (quant==9) {
value = (varble | initnumval);
}
if (quant==10) {
value = (varble ^ initnumval);
}
value = convertDataFromBaseTen(2, value);
return value;
}
}
// this is the function that is called from the button press of add , sub, mul, or div
function mathfunct(letterx){
workbase = currentbase;
if ( (currentbase != 2) && ( (letterx == 8) || (letterx == 9) || (letterx == 10) ) ) {
switchbase(2);
} else if (((letterx == 2) || (letterx == 4)) && (currentbase != 10)) {
switchbase(10);
}
if (fnct == 0) {
fnct = letterx;
counter = document.calculator.textbox.value;
document.calculator.textbox.value = 0;
} else {
if (letterx != 5) {
counter = getanswer(fnct, counter);
fnct = letterx;
} else {
counter = getanswer(fnct, counter);
fnct=0;
document.calculator.textbox.value = counter;
}
}
isdec =0;
// if it is not base 10 convert bact to the base
if ( currentbase != workbase ) {
switchbase(workbase);
}
}
////////////////////////////////////////////////////////////////////////
// these functions have been teseted
// and they seem to work okay
////////////////////////////////////////////////////////////////////////
// this funtion determines which number was pressed or if there was a decimal
// it also sets the text in the buffer which is the textdield
function pickANumber(number) {
// the first 3 if's here filter out based on the base that we are set to
if ((currentbase != 16) && ((number == 'A') || (number == 'B') || (number == 'C')
|| (number == 'D') || (number == 'E') || (number == 'F'))) {
return;
} else if ((currentbase == 8) && (number >=8)) {
return;
} else if ((currentbase == 2) && (number >=2)) {
return;
}
// this does the building of the display buffer when someone enters a number
buffer = document.calculator.textbox.value;
if (buffer == 0){
var textString = number;
} else if ( ((isdec == 1) && (number =='.')) || ((number =='.') && (currentbase != 10)) ) {
var textString = buffer;
} else {
var textString = buffer + number;
}
if ((number =='.') && (currentbase == 10)) {
isdec =1;
}
document.calculator.textbox.value = textString;
}
// this function resets the values for manipulation
function clearfunct() {
buffer=0;
fnct=0;
visnum =0;
isdec =0;
counter = 0;
initnumval = 0;
textString=buffer;
document.calculator.textbox.value = textString;
}
////////////////////////////////////////////////////////////////////////
// below is used to switch between bases
// this code has been cleaned up and works
////////////////////////////////////////////////////////////////////////
// this function handles visually switching between bases
// baseval is the new base to conver to
function switchbase(baseval) {
if (currentbase != 10) {
// convert to base 10
convertToBaseTen(currentbase);
}
if ( baseval == currentbase ) {
return;
}
convertFromBaseTen(new Number(baseval));
currentbase = new Number(baseval);
}
// for conversion of hex numbers
function valuetoint(inval) {
switch(inval) {
case "A":
return 10;
break;
case "B":
return 11;
break;
case "C":
return 12;
break;
case "D":
return 13;
break;
case "E":
return 14;
break;
case "F":
return 15;
break;
default:
return inval;
break;
}
}
// to convert from a base to base 10
// call this with the new base
function convertToBaseTen(inxbase) {
invalue= document.calculator.textbox.value;
document.calculator.textbox.value = convertDataToBaseTen(inxbase, invalue);
}
function convertDataToBaseTen(inxbase, invalue) {
inremainder = 0;
num = 1;
while(num <= invalue.length) {
incount = Math.pow(inxbase,num-1);
inremainder = inremainder + valuetoint(invalue.charAt(invalue.length-num))*incount;
num++;
}
return inremainder;
}
// to convert from base 10 to a base
// NOTE this should work with any base less than 16 but I only use 2, 8, 10, and 16
// call this with the new base
function convertFromBaseTen(xbase) {
inval = new Number(document.calculator.textbox.value);
document.calculator.textbox.value = convertDataFromBaseTen(xbase, inval);
}
function convertDataFromBaseTen(xbase, inval) {
var hex = new Array("0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F");
var remainder = "";
remainder = hex[inval%xbase];
while (inval >= xbase) {
inval = inval - (inval%xbase);
inval = inval / xbase;
if (inval >= xbase) {
remainder = hex[inval%xbase] + remainder;
} else {
remainder = hex[inval] + remainder;
}
}
return remainder;
}
// end script hiding -->