编写自己的函数将十进制数转换为二进制数 [英] Write own function to convert decimal numbers to binary
问题描述
我正在尝试编写自己的函数来将十进制数转换为二进制数.我知道有内置函数，但我正在尝试在这里编写自己的函数，但无法正常工作.
I am trying to write my own function to convert decimal numbers to binary. I know there are build-in functions for this, but I'm trying to write my own here, which I can't get to work correctly.
现在下面的代码没有给我任何输出.我是 PHP 新手，所以提示我哪里出错会有所帮助.
Right now the code below doesn't give me any output. I'm new to PHP so ever hint where I went wrong would help.
代码:
<?php
{
$dec = 0;
if(isset($_POST['num'])) {
$dec = $_POST['num'];
}
decimal_binary($dec);
echo $dec;
}
function decimal_binary($dec)
{
$rem;
$i = 1;
$binary = 0;
while ($dec != 0)
{
$rem = $dec % 2;
$dec /= 2;
$binary += $rem * i;
$i *= 10;
}
$dec = $binary;
echo $binary;
return decimal_binary($dec);
}
?>
<html>
<body>
<form action="3.php" method="POST">
Integer <input type="number" name="num">
<input type="submit">
</form>
</body>
</html>
推荐答案
您刚刚进行了无限递归，我的意思是您正在以结果为参数一遍又一遍地调用该函数.
You just made an infinite recursion, I mean you are calling the function over and over again with the result as parameter.
- 编辑 -
所以你的功能不起作用，但我想出了这个，它确实有效.试试看:
So your function doesn't work, but I came up with this one, and it does work. Try it out:
function decimal_binary($dec){
$binary;
while($dec >= 1){
$rem = $dec % 2;
$dec /= 2;
$binary = $rem.$binary;
}
if($binary == null){
$binary = 0;
}
return $binary;
}
- 结束编辑 -
另外，你需要在调用之前放置函数，调用时需要将它赋值给一个变量，以便你可以在代码的其他部分使用输出值:
Also, you need to place the function before you call it, and when you call it, you need to assign it to a variable so that you can use the output value in other parts of your code:
<?php
// function here
$dec = 0;
if(isset($_POST['num'])){
$dec = $_POST['num'];
}
$bin = decimal_binary($dec);
?>
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