Phep tinh phan so
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Phep tinh phan so
- Code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
->
<html>
<head>
<title>Phep toan phan so</title>
<style type="text/css">
.jsbank_sample_cont {margin: 20px; padding: 20px;}
.jsbank_sample_tit {font-weight: bold; margin-bottom: 10px; padding: 5px; width: auto; background-color: #c0c0c0; border: 5px solid #a0a0a0; color: black; text-align: center;}
</style>
<script type="text/javascript">
var n1, n2, d1, d2, An, Ad, Op;
var neg=1;
function solve(){
//If all fields are numbers
if(!isNaN(document.calc.n1.value)&&!isNaN(document.calc.d1.value)&&!isNaN(document.calc.n2.value)&&!isNaN(document.calc.d2.value)){
//If no fields are blank
if(document.calc.n1.value!=''&&document.calc.d1.value!=''&&document.calc.n2.value!=''&&document.calc.d2.value!=''){
//Set variables:
n1=document.calc.n1.value;// Numerator 1
d1=document.calc.d1.value;// Numerator 2
n2=document.calc.n2.value;// Denominator 1
d2=document.calc.d2.value;// Denominator 2
Op=document.calc.Op.value;// Operator
} else {
//If blank field
alert('Nhap thieu du lieu. Xin dien day du cac o trong!');
}
} else {
//If field has non-number
alert('Chi duoc nhap du lieu so cho cac o!');
}
//Which Operation
switch (Op){
case '+':
//add fractions using formula ((n1*d2)+(n2*d1)) over (d1*d2)
An=(n1*d2)+(n2*d1) //Answer Numerator
Ad=(d1*d2) //Answer Denominator
if(document.calc.reduce.checked==1){
reduce();
} else {
display();
}
break
case '-':
//subtract fractions using formula ((n1*d2)-(n2*d1)) over (d1*d2)
An=(n1*d2)-(n2*d1)//Answer Numerator
Ad=(d1*d2)//Answer Denominator
if(document.calc.reduce.checked==1){
reduce();
} else {
display();
}
break
case '*':
//multiply fractions using formula (n1*n2) over (d1*d2)
An=n1*n2;//Answer Numerator
Ad=d1*d2; //Answer Denominator
if(document.calc.reduce.checked==1){
reduce();
} else {
display();
}
break
case '/':
//divide fractions using formula (n1*d2) over (d1*n2)
An=n1*d2;//Answer Numerator
Ad=d1*n2;//Answer Denominator
if(document.calc.reduce.checked==1){
reduce();
} else {
display();
}
break
}
}
function reduce() {
neg=1; //1 if positive, -1 if negative
//convert to strings
ng=An+'';
dg=Ad+''
if(ng.indexOf('-')!=-1){ //check to see if answer is negative.
neg=-1
}
if(dg.indexOf('-')!=-1){
neg=-1
}
if(ng.indexOf('-')!=-1&&dg.indexOf('-')!=-1) {//if both numerator and denominator are negative the answer is positive
neg=1
}
var factorX //highest common factor
if ( An == 0 || Ad == 0 ) {
factorX=1;
return;
}
An = Math.abs( An );
Ad = Math.abs( Ad );
var factorX = 1;
//Find common factors of Numerator and Denominator
for ( var x = 2; x <= Math.min( An, Ad ); x ++ ) {
var check1 = An / x;
if ( check1 == Math.round( check1 ) ) {
var check2 = Ad / x;
if ( check2 == Math.round( check2 ) ) {
factorX = x;
}
}
}
An=(An/factorX)*neg; //divide by highest common factor to reduce fraction then multiply by neg to make positive or negative
Ad=Ad/factorX; //divide by highest common factor to reduce fraction
display();
}
function display(){
//Display answer
document.calc.An.value = An;
document.calc.Ad.value = Ad;
}
// -->
</script>
</head>
<body>
<center><h1>Phep tinh ve phan so</h1>
<fieldset class=jsbank_sample_cont>
<legend
<table width="300" align="center" border="0" cellspacing="0" cellpadding="4" style="background-color:#ffffff;border:1px #000000 solid;">
<tr>
<td align="center" valign="middle">
<h4>Nhap so vao cac o duoi day,<br>bam dau bang (=) de thuc hien.</h4>
<form name="calc">
<table align="center" width="50" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="border-bottom:2px #000000 solid;"><input type="text" size="2" name="n1" id="n1" tabindex="1"></td>
<td rowspan="2" align="center" valign="middle">
<select name="Op" tabindex="3">
<option value="+">+ (cong)</option>
<option value="-">- (tru)</option>
<option value="*">x (nhan)</option>
<option value="/">/ (chia)</option>
</select>
</td>
<td style="border-bottom:2px #000000 solid;"><input type="text" size="2" name="n2" id="n2" tabindex="4"></td>
<td rowspan="2" align="center" valign="middle"><input type="button" value=" = "onClick="solve();" tabindex="6"></td>
<td style="border-bottom:2px #000000 solid;"><input type="text" size="2" name="An" id="An" readonly="1"></td>
</tr>
<tr>
<td><input type="text" size="2" name="d1" id="d1" tabindex="2"></td>
<td><input type="text" size="2" name="d2" id="d2" tabindex="5"></td>
<td><input type="text" size="2" name="Ad" id="Ad" readonly="1"></td>
</tr>
</table>
<br><input type="checkbox" name="reduce" id="reduce" checked> Toi gian phan so
</form>
</td>
</tr>
</table>
</fieldset>
</center>
</body>
</html>
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