Greek mathematicians took special interest in integers that are equal to the sum of their proper divisors (a
proper divisor of an integer nis any divisor strictly less than nitself.) They called such numbers perfect
numbers. For example, 6is a perfect number because it is the sum of 1, 2, and 3, which are the
integers less than 6that divide evenly into 6. Similarly, 28is a perfect number because its proper divisors
are 1, 2, 4, 7, and 14.
Write a predicate function IsPerfectwhich takes an integer nas its only argument and returns TRUEif
and only if nis perfect, and FALSEotherwise. (Sadly enough, this problem has no fast food references.)
/*
*Function:IsPerfect
*if(IsPerfect(number)){
*-------------------
*IsPerfectreturnsTRUEifandonlyifthethespecifiedintegerisa
*perfectinteger.Anumberisperfectifandonlyifitequalsthesum
*ofitsproperdivisors.Thespecifiedintegerisassumedtobe
*positive,andnoerrorcheckingisperformed.
*/
boolIsPerfect(intn)

我其实就是想问

perfect number就是，一个数的约数之和等于他本身。 比如6=1+2+3 28=1+2+4+7+14 我现在需要用这个函数 bool IsPerfect(int n) 接下来该写什么？用for 里面套if吗？怎么用呢？

还好我懂点中文

基本框架：

int i,s=0;

for(i=1;1<n/2;i++)if(n%i==0)s+=i;

return !(s-n);

谢谢哦，我写出来了再来谢你

!(s-n);代表什么

返回值

if 这个数的约数只和等于这个数 !(s-n)==1;

else !(s-n)==0;

为什么返回值用这个呢

why use english？

our teacher use it