说明：  两个有趣的Fortran小程序，一个输出n阶幻方，可手改又有趣；另一个对哥德巴赫猜想做了证明，可手改在任意范围内证明。
(2 Interestingly small Fortran programs, an output of n-order magic square can be a fun change hands the other pairs have done a proof of Goldbach' s conjecture can be changed at any hand within the framework of proof.)