自己设计的24点游戏，利用穷举法，可以计算任意4个小于13的数的24点，并给出算法，而且可以让用户输入答案，判断答案的正确性。-24 points of their own design games, the use of exhaustive method can calculate any of the four is less than 13 the number of 24 points, and gives algorithm