玩家只需根据系统给出的四张1～9的纸牌算出24即可，程序主要负责实现随机发牌、结果验算、计算得分和难度设置等功能。-Players only need to give the system the four playing cards 1 to 9 can be calculated 24, the program is responsible for licensing to achieve random results checking, calculating scores and dif