Postfix notation is a mathematical notation in which operators follow their operands. In other words, pfexp1 pfexp2 op, where pfexp1 and pfexp2 are both postfix expressions. Some examples: • 2 2 + is the postfix notation of the expression 2 + 2. • 2 3 * 1 - 5 / is the postfix notation of the expression ((2 * 3) - 1) / 5. Here you have to compute the result from a postfix expression. Examples postfix ("2 2 +") 4 // 2 + 2 = 4 postfix("2 3 * 1 - 5 /") → 1 // ((2 * 3) - 1) / 5 = (6 - 1) / 5 = 5 / 5 = 1

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