C++数据结构中缀表达式转后缀表达式源码集，把中缀表达式转换为后缀表达式，返回后缀表达式的长度（包括空格），由后缀表达式计算出数值结果，遇到右括号将其对应左括号后的操作符（操作符栈中的）全部写入后缀表达式，若当前的操作符小于等于栈顶操作符的优先级时，将栈顶操作符写入到后缀表达式，重复此过程-C++ data structures Infix expression to postfix expression source set, the infix expression convert postfix expression, the expression returns the length of the suffix (including spaces), calculated by a numerical suffix expression results will encounter a right parenthesis the corresponding left parenthesis after the operator when the (operator stack) all written postfix expression, if the current operator stack less operator precedence, the operator stack is written to postfix expression, this process is repeated