C :

#include<stdio.h>
int main()
{
    int i,a,b,c;
    for(i=100;i<1000;i++)
    {
        a=i/100;
        b=(i/10)-a*10;
        c=i%10;
        if(a*a*a+b*b*b+c*c*c==i)
            printf("%d\n",i);
    }
    return 0;
}

C++ :

#include<iostream>
#include<algorithm>
#include<cstring>
#include<ctime>
#include<cmath>
#include<string>
#include<cstdio>
using namespace std;

//生成测试数据
void initData()
{
    srand((int)time(NULL));
    for(int cas = 0; cas < 10; ++cas)
    {

    }
}

bool f(int n)
{
    int a = n % 10;
    int b = n / 10 % 10;
    int c = n / 100;
    if(a * a * a + b * b * b + c * c * c == n) return true;
    return false;
}

int main()
{
    //freopen("test.in", "w", stdout);
    //freopen("test.in", "r", stdin);
    //freopen("test.out", "w", stdout);
    //initData();
    for(int i = 100; i < 1000; ++i)
    {
        if(f(i)) cout<<i<<endl;
    }
    return 0;
}