Question

编程求,x和n的值从键盘输入...方程式见图片。谢谢。

有没C++，帮忙做的。。。。

Answer 1

只会写perl，纯手打呀。。。

#!/usr/bin/perl
use strict;
print("input x=");
chomp(my $x = <>);
die ("error ,only natural number permitted \n") if($x !~ /\d+/ or $x <= 0);
print("input n=");
chomp(my $n = <>);
die ("error , only natural number permitted\n") if($n !~ /\d+/ or $n <= 0);
my $result = 1;
for (my $i = 1;$i <=$n;$i++)
{
my $denominator = 1;
my $factor = $i % 2 == 0 ? 1 : -1;
for(my $j = 1;$j<=$i;$j++) {$denominator *= $j;}
$result += $factor * ($x**$i) / $denominator;
}
print("result is $result\n");

Answer 2

s=0;
p=1;
for(i=1;i<n;i++)
{s=s+p;
p=(-1)*p*x/i;
}
printf("p=%f",p);