#include<iostream>

using namespace std;

int main ()

{
   
    int a,b,c,sum;
   
    sum=0;

    for(a=1;a<=1000;a=a+1)
   
    {
                          
                          for(b=1;b<a;b=b+1)
                          
                          {
                                             
                                         c=a%b;
                                         
                                         if(c==0)
                                         
                                         sum=sum+b;
                          }
                             
                           if(a==sum)
                           
                           cout<<a<<endl;            
                                         
                          }
                          
   
    system("pause");
   
    return 0;
   
}

可以運行呀~~
只是遞歸后你a都不对等于sum,所以没有打印变量a

那帮我修改一下吧！！！

谢谢了

还有那个地方是怎么不对？

#include<iostream>
using namespace std;
int main ()
{   
    int a,b,c,sum;  
    for(a=1;a<=1000;a=a+1)   
    { sum=0;                        
                     for(b=1;b<a;b=b+1)                          
                          {                                          
                              c=a%b;                                         
                              if(c==0)                                         
                              sum=sum+b;
                          }                             
                           if(a==sum)                           
                           {
                               cout<<a<<"的因子是：";     
                               for(int i=1;i<a;i++)
                                  if(a%i==0)
                                      cout<<i<<"  ";
                                  cout<<endl;
                           }
  
  }  
    return 0;
}

谢谢了
修改的能用了
看了半天，但为什么只是把sum=0；换个位置就可以了呢？？？

[[it] 本帖最后由 wanghuaduo 于 2008-3-26 21:30 编辑 [/it]]

因为如果在for 循环内，每次循环开始时 sum=0；而在外面sum就是  +了b后的值；