The following program converts an expression from infix to postfix notation. The conversion is carried out with the help of a stack. For example, to turn the expression (A + B) into the postfix form A B +, we ignore the left parenthesis, convert the A to postfix form, we store the + operator on the stack, we convert B to postfix form and then, when find the right parenthesis, we pop the + operator from the top of the stack. In particular, the following implementation works only for the addition and multiplication of integers.
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