Word Count : 646

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To evaluate prefix and postfix expressions in C, stacks are the most appropriate data structures because both expression types rely on LIFO (Last In First Out) behavior for correct evaluation. In a prefix expression, operators precede operands, so evaluation proceeds from right to left, whereas in a postfix expression, operators follow operands, and evaluation proceeds from left to right. Using a stack allows operands to be stored temporarily, and operators can then apply operations on the top elements of the stack as they are encountered. For the prefix expression `+, -, , 3, 2, 7, 8, 4, 1`, the program reads the expression from right to left. When an operand is encountered, it is pushed onto the stack. When an operator is encountered, the top two operands are popped _______ ________ ___ __________ _________.
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