说明：  如果一个正整数等于其各个数字的立方和，则称该数为阿姆斯特朗数(亦称为自恋性数)。 如 407=43+03+73就是一个阿姆斯特朗数。试编程求1000以内的所有阿姆斯特朗数
(if one is integral to its various figures and Cubic, says the number of Armstrong (also known as narcissistic sexual numbers). If 407 = 43 03 73 Armstrong is a few. Examination Program for 1000 all within a few Armstrong)