Given a string representing an expression of fraction addition and subtraction, you need to return the calculation result in string format. The final result should be irreducible fraction. If your final result is an integer, say 2, you need to change
Java后缀自增/自减表达式的返回值 今天看到一段代码,描述循环k次 while(k-- > 0){ //... } 直觉上认为是错的,k--后值变成了k-1,循环应该只能执行k-1次吧.实际这段代码是正确的.在Java8语言规范15.14.3中有以下描述: The value of the postfix decrement expression is the value of the variable before the new value is stored. 即后缀自减表达式的值为存储