简化分数 [英] Simplify a Fraction
本文介绍了简化分数的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何简化PHP的一部分?
How can I simplify a fraction in PHP?
例如,将40/100
转换为2/5
.
我唯一想到的方法是对两个数字进行素分解并比较类似的结果,但是我也不十分确定该怎么做.
The only way I could think of is to do a prime factorization on both numbers and compare like results, but I'm not really sure how to do that either.
推荐答案
简化分数时,将分子和分母除以它们的最大公约数.
When you simplify a fraction, you divide the numerator and denominator by their greatest common divisor.
因此,您所需要做的就是计算两个数字的GCD.它没有内置功能,但是很容易实现欧几里得算法:
So all you need is to calcuate the GCD of the two numbers. There's no built-in function for that, but it's easy enough to implement the euclidean algorithm:
function gcd($a,$b) {
$a = abs($a); $b = abs($b);
if( $a < $b) list($b,$a) = Array($a,$b);
if( $b == 0) return $a;
$r = $a % $b;
while($r > 0) {
$a = $b;
$b = $r;
$r = $a % $b;
}
return $b;
}
然后将顶部和底部除以该值.
Then just divide the top and bottom by that.
function simplify($num,$den) {
$g = gcd($num,$den);
return Array($num/$g,$den/$g);
}
var_export(simplify(40,100)); // Array(2,5)
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