在PHP中找到数字的阶乘
给定一个数字,我们必须找到它的阶乘。
查找阶乘的公式: 5!(5的方格)= 5x4x3x2x1 = 120
示例
Input: 5Output: 120
在PHP中查找数字阶乘的程序
<?php//查找数字阶乘的程序
//在这里,我们正在设计一个功能
//将数字作为参数并返回
//该数字的阶乘
//功能:getFactorial-
function getFactorial($num){
//声明一个变量并赋值为1-
$factorial = 1;
for($loop = 1; $loop <= $num; $loop++)
$factorial = $factorial * $loop;
return $factorial;
}
//测试上述功能的主代码
$number = 1;
print_r("Factorial of ".$number. " is = ".getFactorial($number). "\n");
$number = 2;
print_r("Factorial of ".$number. " is = ".getFactorial($number). "\n");
$number = 3;
print_r("Factorial of ".$number. " is = ".getFactorial($number). "\n");
$number = 4;
print_r("Factorial of ".$number. " is = ".getFactorial($number). "\n");
$number = 5;
print_r("Factorial of ".$number. " is = ".getFactorial($number). "\n");
?>
输出结果
Factorial of 1 is = 1Factorial of 2 is = 2
Factorial of 3 is = 6
Factorial of 4 is = 24
Factorial of 5 is = 120
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