可以算加减乘除24，可以求所有的解，但又重复的，没有刻意去掉-can calculate the arithmetic of 24, can help all the solutions, but to repeat, not deliberately removed

计算24点，随机生成4个10一下的数，要求算出24，如果输入错误，则输出答案-Calculation of 24 points, randomly generated four 10-bit number, requiring calculated 24, if the input error, the output answers

利用C语言递归的优点计算24点，输入任意4个数，输出所有可能结果-The advantages of the C language recursion 24 points, enter any number 4, the output of all possible outcomes