计算二十四点游戏，程序随机生成 1~13 中的四个数，用户给出算式，程序验证是否正 确。-Calculate the 24.2 game, the program randomly generated four number 1 to 13, the user is given the formula, program verification is correct.

计算二十四点游戏，程序随机生成1~13中的四个数，用户给出算式，程序验证是否正确-Calculation of 24.2 games, the program randomly generated four number 1 to 13, the user is given the formula, program verification is correct