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Q:开发一个生成四则运算的程序
思路:
(1)括号有五种情况,这个用IF ELSE或者SWITCH处理。
(2)操作符有三种情况,三层循环。
(3)生成大小合适的数字,比如20以下。
(4)注意除号的分母不能是0。