If an operator is found back up to get the required number


1. Postfix expressions are evaluated according to the following rules:

a. Scan the expression from left to right.

b. If an operator is found, back up to get the required number of operands, evaluate the operator, and continue.

2. The STL class stack can be used to implement a stack in a program.

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Basic Computer Science: If an operator is found back up to get the required number
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