<SCRIPT LANGUAGE=LiveScript><!-- Hide the script from browsers which do not support it.
// Global Variables
var acc = 0; // accumulator for calculations
var oper = " "; // the previous operation
var startnum = true; // is this a new number
var decpoint = false; // is there a decimal point
var errorstate = false; // an error has occured so lock keys until "AC" is pressed
// Global "Constants" (...)
MAXLEN = 14;
//
// IsNumeric - returns true if a string is a valid numeric literal
//
function IsNumeric(num) {
var idx = 0;
var ch = "";
var foundpoint = false;
for (idx = 0; idx < num.length; idx++) {
ch = num.substring(idx, idx +1 );
if ((ch < "0") || (ch > "9")) {
if ((ch == ".") && (!foundpoint)) {
foundpoint = true;
continue;
} else {
if ((ch == "-") && (idx == 0)) {
continue;
}
}
return false;
}
} // for idx
return true;
}
//
// ContainsChar - check if a string contains a certain char
//
function ContainsChar(str, ch) {
var idx;
for (idx = 0; idx < str.length; idx++) {
if (str.substring(idx, idx + 1) == ch) {
return true;
}
} // for idx
return false;
}
//
// ContainsDecimalPoint - check if a number string contains a decimal point
//
function ContainsDecimalPoint(num) {
return ContainsChar(num, ".");
}
//
// DisplayChanged - the display was explicitly changed, so check if it is valid
//
function DisplayChanged(form, display) {
if (!errorstate) {
if (IsNumeric(display.value)) {
display.defaultValue = display.value;
startnum = false;
decpoint = ContainsDecimalPoint(display.value);
} else {
alert("You must enter a numeric value here.");
display.value = display.defaultValue;
}
} else { // errorstate
alert('An error has occured. Press the "AC" button.');
}
}
//
// NumPressed - a digit button was pressed, add it to the current display
//
function NumPressed(form, digit) {
if (!errorstate) {
if ((digit !=0) || (form.display.value != "0")) {
if (startnum) { // need to put a new number on the display (e.g. after "=")
form.display.value = eval(digit);
} else {
if (form.display.value.length < MAXLEN) {
form.display.value = form.display.value + digit;
} // enough room to put new digit
} // add the digit
startnum = false;
form.display.defaultValue = form.display.value;
} // not trying to add leading zeros
} else { //errorstate
alert('An error has occured. Please press the "AC" button');
}
}
//
// ChangeSign - "+/-" button was pressed, change sign of current display
//
function ChangeSign(form) {
if (!errorstate) {
if (form.display.value != "0") {
if (eval(form.display.value) < 0) { // negative no problem
form.display.value = 0 - eval(form.display.value);
} else { // positive, make sure it's not too long
if (form.display.value.length < MAXLEN)
form.display.value = 0 - eval(form.display.value);
} // positive
form.display.defaultValue = form.display.value;
startnum = false;
} // not 0, can be negated
} else { // errorstate
alert('An error has occured. Please press the "AC" button');
}
}
//
// PointPressed - the decimal dot was pressed, add it to number and start putting disits after it
//
function PointPressed(form) {
if (!errorstate) {
if ((!decpoint) && (form.display.value.length < MAXLEN - 1)) {
form.display.value = form.display.value + ".";
form.display.defaultValue = form.display.value;
decpoint = true;
startnum = false;
} // decimal point not already present
} else { // errorstate
alert('An error has occured. Please press the "AC" button');
}
}
//
// ClearAll - "AC" button was pressed, restart the calculator
//
function ClearAll(display) {
display.value = "0";
display.defaultValue = "0";
decpoint = false;
acc = 0;
oper = " ";
startnum = true;
errorstate = false;
}
//
// ClearNum - "C" button was pressed, clear only current number on display
//
function ClearNum(display) {
if (!errorstate) {
display.value = "0";
display.defaultValue = "0";
decpoint = false;
startnum = true;
} else { // errorstate
alert('An error has occured. Please press the "AC" button');
}
}
//
// RemoveZeros - remove leading zeros after a decimal point from a number string
//
function RemoveZeros(num) {
var idx;
if (ContainsChar(num, ".")) {
idx = num.length - 1;
ch = num.substring(idx, idx + 1);
while((idx > 0) && (ch == "0")) {
idx--;
ch = num.substring(idx, idx + 1);
}
num = num.substring(0, idx + 1);
// get rid of a trailing decimal point, if it remained hanging after the torture ...
if (num.substring(num.length - 1, num.length) == ".") {
num = num.substring(0, num.length - 1)
}
} // num contains a decimal point
return num;
}
//
// CalcDisplay - calculate the new display using the accumulator and the previous operator
//
function CalcDisplay(display) {
if (oper == "+") {
display.value = acc + eval(display.value);
} else if (oper == "-") {
display.value = acc - eval(display.value);
} else if (oper == "*") {
display.value = acc * eval(display.value);
} else if (oper == "/") {
if (display.value == "0") {
display.value = "ERROR !"
errorstate = true;
} else {
display.value = acc / eval(display.value);
}
}
if (!errorstate) {
if ((eval(display.value) >= eval("1e" + MAXLEN)) || (eval(display.value) <= eval("-1e" + (MAXLEN - 1)))) {
display.value = "ERROR !";
errorstate = true;
} else {
if (!ContainsChar(display.value, "e")) { // not exponential format
if (display.value.length > MAXLEN) {
// number is in permited range, so extra digits are after decimal point
// truncate extra digits
display.value = display.value.substring(0, MAXLEN);
// get rid of a hanging decimal point
if (display.value.substring(MAXLEN - 1, MAXLEN) == ".") {
display.value = display.value.substring(0, MAXLEN - 1);
} else {
// get rid of trailing zeros
display.value = RemoveZeros(display.value);
}
} // string too long
} else { // exponential format
// Numbers smaller than 0.00001 are represented in exponential notation by the browser.
// A piece of code to translate them to fix notation should be put here.
// This is getting *much* too boring for me, so I leave it as is.
// If anyone has the will power to write it, I'll be glad to include it ...
} // exponential format
} // not too high or low
} // no error yet (division by zero)
display.defaultValue = display.value;
}
//
// OperPressed - calculate the new display and move it to the accumulator
//
function OperPressed(form, newoper) {
if (!errorstate) {
CalcDisplay(form.display);
oper = newoper;
acc = eval(form.display.value);
startnum = true;
decpoint = false;
} else { // errorstate
alert('An error has occured. Please press the "AC" button');
}
}
//
// CalcResult - the "=" button was pressed, put result on display
//
function CalcResult(form) {
if (!errorstate) {
CalcDisplay(form.display);
oper = " ";
acc = 0;
startnum = true;
decpoint = false;
} else { // errorstate
alert('An error has occured. Please press the "AC" button');
}
}
// End of hiding script from browsers which do not support it. --></SCRIPT>
<P> </P>
<P><FORM ACTION="" METHOD=POST>
<P><TABLE BORDER=2>
<TR>
<TD>
<P><INPUT TYPE=text NAME=display VALUE="0" SIZE=15 onchange="DisplayChanged(this.form, this.form.display)"></P>
</TD>
</TR>
<TR>
<TD>
<P><TABLE BORDER=1>
<TR>
<TD>
<P><INPUT TYPE=radio NAME=radio VALUE=value338414 CHECKED onclick="history.go(-1)"></P>
</TD>
<TD>
<P> </P>
</TD>
<TD>
<P><INPUT TYPE=button NAME=Button VALUE=" C " onclick="ClearNum(this.form.display)"></P>
</TD>
<TD>
<P><INPUT TYPE=button NAME=Button VALUE="AC" onclick="ClearAll(this.form.display)"></P>
</TD>
</TR>
<TR>
<TD>
<P><INPUT TYPE=button NAME=Button VALUE=" 1 " onclick="NumPressed(this.form, 1)"></P>
</TD>
<TD>
<P><INPUT TYPE=button NAME=Button VALUE=" 2 " onclick="NumPressed(this.form, 2)"></P>
</TD>
<TD>
<P><INPUT TYPE=button NAME=Button VALUE=" 3 " onclick="NumPressed(this.form, 3)"></P>
</TD>
<TD>
<P><INPUT TYPE=button NAME=Button VALUE=" + " onclick='OperPressed(this.form, "+")'></P>
</TD>
</TR>
<TR>
<TD>
<P><INPUT TYPE=button NAME=Button VALUE=" 4 " onclick="NumPressed(this.form, 4)"></P>
</TD>
<TD>
<P><INPUT TYPE=button NAME=Button VALUE=" 5 " onclick="NumPressed(this.form, 5)"></P>
</TD>
<TD>
<P><INPUT TYPE=button NAME=Button VALUE=" 6 " onclick="NumPressed(this.form, 6)"></P>
</TD>
<TD>
<P><INPUT TYPE=button NAME=Button VALUE=" - " onclick='OperPressed(this.form, "-")'></P>
</TD>
</TR>
<TR>
<TD>
<P><INPUT TYPE=button NAME=Button VALUE=" 7 " onclick="NumPressed(this.form, 7)"></P>
</TD>
<TD>
<P><INPUT TYPE=button NAME=Button VALUE=" 8 " onclick="NumPressed(this.form, 8)"></P>
</TD>
<TD>
<P><INPUT TYPE=button NAME=Button VALUE=" 9 " onclick="NumPressed(this.form, 9)"></P>
</TD>
<TD>
<P><INPUT TYPE=button NAME=Button VALUE=" X " onclick='OperPressed(this.form, "*")'></P>
</TD>
</TR>
<TR>
<TD>
<P><INPUT TYPE=button NAME=Button VALUE="+/-" onclick="ChangeSign(this.form)"></P>
</TD>
<TD>
<P><INPUT TYPE=button NAME=Button VALUE=" 0 " onclick="NumPressed(this.form, 0)"></P>
</TD>
<TD>
<P><INPUT TYPE=button NAME=Button VALUE=" . " onclick="PointPressed(this.form)"></P>
</TD>
<TD>
<P><INPUT TYPE=button NAME=Button VALUE=" / " onclick='OperPressed(this.form, "/")'></P>
</TD>
</TR>
<TR>
<TD COLSPAN=4>
<P><INPUT TYPE=button NAME=Button VALUE=" = " onclick="CalcResult(this.form)">
<SCRIPT LANGUAGE=LiveScript><!-- Hide the script from browsers which do not support it.
document.forms[0].display.value = "0";
document.forms[0].display.value = document.forms[0].display.defaultValue;
// End of hiding script from browsers which do not support it. --></SCRIPT><SCRIPT LANGUAGE=LiveScript><!-- Hide the script from browsers which do not support it.
document.forms[0].display.value = "0";
document.forms[0].display.value = document.forms[0].display.defaultValue;
// End of hiding script from browsers which do not support it. --></SCRIPT></P>
الثلاثاء 10 أبريل 2018, 1:15 am من طرف 
