使用MATLAB编写：一个数如果恰好等于它的因子之和，这个数就称为"完数"。例如，6的因子为1,2,3，而 6=1+2+3，因此6是"完数"。编程序找出1000之内的所有完数，并按下面格式输出其因子： 6 its factors are 1,2,3

以下是MATLAB代码实现：

for i = 1:1000
factors = [];
for j = 1:i-1
if mod(i,j) == 0
factors = [factors j];
end
end
if sum(factors) == i
fprintf('%d its factors are ', i);
for k = 1:length(factors)
fprintf('%d,', factors(k));
end
fprintf('\b\n');
end
end

输出结果如下：

6 its factors are 1,2,3
28 its factors are 1,2,4,7,14
496 its factors are 1,2,4,8,16,31,62,124,248