这个伪代码的输出是什么?

a = [10,2,2,2]
p = a[0]
for i in range(1,len(a)):
    temp = p
    for j in range(a[i]):
        p *= temp
print p

1,000,000,000,000,000,000,000,000,000

• 在PHP代码中,您将temp设置为arr[i],而不是p(我将在这里包括它,这样在您将其从问题中编辑出来之后,我的答案仍然有意义:-)。

  $arr = array(10, 2, 2, 2);
  $p = $arr[0];
  $temp = 0;
  for($i = 1; $i <= 3; $i++)
  {
      $temp = $arr[$i];
      for($j = 0; $j <= $arr[$i]; $j++)
      {
          $p = $p * $temp;
      }
  }
  echo $p;
  

我将程序输入到TI-89中,得到的p值为1e27。

t(a)
Func
  Local i,j,p,tmp
  a[1]->p
  For i,2,dim(a)
    p->tmp
    For j,1,a[i]
      p*tmp->p
    EndFor
  EndFor
  Return p
EndFunc

t({10,2,2,2})       1.E27

(((a_1^(a_2+1))^(a_3+1))^(a_4+1)...

因此我们得到((10^3)^3)^3=10^3=10^27

{10, 2, 2, 2}

p = 10
i = 2 to 4
 temp = p = 10
 j = 1 to 2
  p = 10 * 10 = 10^2
  p = 10^2 * 10 = 10^3
i = 3 to 4
 temp = 10^3
 j = 1 to 2
  p = 10^3 * 10 = 10^4 -- p=p*temp, p=10^3 and temp=10^3, hence p=10^3 * 10^3.
  p = 10^4 * 10 = 10^5 -- Similarly for other steps.
i = 4 to 4
 temp = 10^5
 j = 1 to 2
  p = 10^5 * 10 = 10^6
  p = 10^6 * 10 = 10^7

人们称Python为“可执行伪代码”是有原因的:

>>> def doSomething(*args):
...     args = list(args);
...     p = args.pop(0)
...     for i in range(len(args)):
...         temp = p
...         for j in range(args[i]):
...           p *= temp
...     return p
...
>>> print doSomething(10,2,2,2)
1000000000000000000000000000

在C中:

#include <stdio.h>

double DoSomething(double array[], int count)
{
  double p, temp;
  int i, j;

  p = array[0];

  for(i=1;i<count;i++)
  {
    temp = p;
    for(j=0; j<array[i];j++)
    {
      printf("p=%g, temp=%g\n", p, temp); /* useful to see what's going on */
      p = p * temp;
    }
  }
  return p; /* this isn't specified, but I assume it's the procedure output */
}

double array[4] = {10.0,2.0,2.0,2.0};

int main(void)
{
  printf("%g\n", DoSomething(array, 4));
  return 0;
}

正如其他人所指出的,10e27。请注意,上面的伪代码非常冗长,可以通过多种方式简化。

我用了 Tiny C Compiler -非常小,重量轻,易于使用的简单的东西像这样。