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  제목   [JavaScript] 공학용 계산기 1998/10/07 (13:23)
이름 김효원
번호 41
조회 344
본문 <!-- TWO STEPS TO INSTALL YOUR SCIENTIFIC CALCULATOR:

  1.  Paste the designated coding into the HEAD of your HTML document
  2.  Put the last script into the BODY of your HTML document  -->

<!-- STEP ONE: Copy this code into the HEAD of your HTML document  -->
                 
<HEAD>

<SCRIPT LANGUAGE="JavaScript">


<!-- This script and many more are available online from -->
<!-- The JavaScript Source!! http://javascriptsource.com -->

<!-- Begin
function addChar(input, character) {
if(input.value == null || input.value == "0")
input.value = character
else
input.value += character
}
function cos(form) {
form.display.value = Math.cos(form.display.value);}
function sin(form) {
form.display.value = Math.sin(form.display.value);}
function tan(form) {
form.display.value = Math.tan(form.display.value);}
function sqrt(form) {
form.display.value = Math.sqrt(form.display.value);}
function ln(form) {
form.display.value = Math.log(form.display.value);}
function exp(form) {
form.display.value = Math.exp(form.display.value);}
function sqrt(form) {
form.display.value = Math.sqrt(form.display.value);}
function deleteChar(input) {
input.value = input.value.substring(0, input.value.length - 1)
}
function changeSign(input) {
if(input.value.substring(0, 1) == "-")
input.value = input.value.substring(1, input.value.length)
else
input.value = "-" + input.value
}
function compute(form)  {
form.display.value = eval(form.display.value)}
function square(form)  {
form.display.value = eval(form.display.value) *
eval(form.display.value)}
function checkNum(str)  {
for (var i = 0; i < str.length; i++) {
var ch = str.substring(i, i+1)
if (ch < "0" || ch > "9") {
if (ch != "/" && ch != "*" && ch != "+" && ch !=
"-" && ch != "."
&& ch != "(" && ch!= ")") {
alert("invalid entry!")
return false
        }
     }
  }
return true
}
// End -->

</SCRIPT>

<!-- STEP TWO: Copy this code into the BODY of your HTML document  -->

<BODY>

<CENTER>
<FORM>
<input name="display" value="0" size=25></td>
<br>
<input type="button" value="   exp  " onClick="if (checkNum(this.form.display.value)) {
exp(this.form) }">
<input type="button" value="    7    " onClick="addChar(this.form.display, '7')">
<input type="button" value="    8    " onClick="addChar(this.form.display, '8')">
<input type="button" value="    9    " onClick="addChar(this.form.display, '9')">
<input type="button" value="    /    " onClick="addChar(this.form.display, '/')">
<br>
<input type="button" value="   ln    " onClick="if (checkNum(this.form.display.value)) {
ln(this.form) }">
<input type="button" value="    4    " onClick="addChar(this.form.display, '4')">
<input type="button" value="    5    " onClick="addChar(this.form.display, '5')">
<input type="button" value="    6    " onClick="addChar(this.form.display, '6')">
<input type="button" value="    *    " onClick="addChar(this.form.display, '*')">
<br>
<input type="button" value="   sqrt  " onClick="if (checkNum(this.form.display.value)) {
cos(this.form) }">
<input type="button" value="    1    " onClick="addChar(this.form.display, '1')">
<input type="button" value="    2    " onClick="addChar(this.form.display, '2')">
<input type="button" value="    3    "  onClick="addChar(this.form.display, '3')">
<input type="button" value="    -    "  onClick="addChar(this.form.display, '-')">
<br>
<input type="button" value="   sq    " onClick="if (checkNum(this.form.display.value)) {
square(this.form) }">
<input type="button" value="    0    " onClick="addChar(this.form.display, '0')">
<input type="button" value="    .    " onClick="addChar(this.form.display, '.')">
<input type="button" value="   +/-   " onClick="changeSign(this.form.display)">
<input type="button" value="    +    " onClick="addChar(this.form.display, '+')">
<br>
<input type="button" value="    (    " onClick="addChar(this.form.display, '(')">
<input type="button" value="   cos   " onClick="if (checkNum(this.form.display.value)) {
cos(this.form) }">
<input type="button" value="   sin   " onClick="if (checkNum(this.form.display.value)) {
sin(this.form) }">
<input type="button" value="   tan   " onClick="if (checkNum(this.form.display.value)) {
tan(this.form) }">
<input type="button" value="    )    " onClick="addChar(this.form.display, ')')">
<br>
<input type="button" value="   Clear       "  onClick="this.form.display.value = 0 ">
<input type="button" value="   Back Space  " onClick="deleteChar(this.form.display)">
<input type="button" value="   Enter       " name="enter"
onClick="if (checkNum(this.form.display.value)) {
compute(this.form) }">
</FORM>
</CENTER>

<!-- Script Size:  4.63 KB  -->
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