Read the infix expression from left to right, one character at a time.
从左到右读入中缀表达式，每次一个字符。
Read the infix expression from left to right , one character at a time.
从左到右读入中缀表达式，每次一个字符。
The conversion process involves reading the operands, operators, and parentheses of the infix expression using the following algorithm.
转换过程包括用下面的算法读入中缀表达式的操作数、操作符和括号。
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