计算最小公倍数和最大公约数 字符串加密和解密 计算π的近似值 输出所有的水仙花数-Least common multiple and greatest common divisor calculation of string encryption and decryption of all output approximation to calculate π few daffodils

该程序针对图像近似系数和高频系数进行加密，以达到加密的效果(The program encrypts the image approximation coefficient and the high frequency coefficient to achieve the encrypted effect.)