Virtual Labs

1. A postfix expression is also called ______.

a: RPN Explanation

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b: PN Explanation

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c: DNP Explanation

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d: GNP Explanation

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2. An expression in which the operator is written after its operands is called a ______ expression.

a: Infix Explanation

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b: Postfix Explanation

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c: Prefix Explanation

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d: None of these Explanation

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3. Which of the following is an infix expression?

a: b * c + d / e Explanation

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b: b*cde/+ Explanation

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c: + + A * B C D Explanation

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d: ABD*C++ Explanation

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4. Which of the following is a valid prefix expression for the infix expression

a+b*c

a: + a * b c Explanation

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b: a b + c * Explanation

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c: a b c * + Explanation

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d: a + b * c Explanation

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5. Which of the following is a valid postfix expression for the infix expression

a+b*c

a: ab+c* Explanation

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b: abc*+ Explanation

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c: a+bc* Explanation

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d: *+abc Explanation

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6. Which statement correctly distinguishes infix, prefix, and postfix notation?

a: Infix places operators between operands, prefix places operators before operands, and postfix places operators after operands. Explanation

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b: All three notations place operators in the same position. Explanation

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c: Prefix and postfix are identical to infix notation. Explanation

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d: Postfix requires every operator to appear before its operands. Explanation

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7. For the expression

a+b*c

, which operator has higher precedence?

+

Explanation

*

Explanation

c: Both have equal precedence Explanation

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d: Neither operator has precedence Explanation

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8. Why are parentheses important in an infix expression such as

(a+b)*c

a: They specify a grouping that can override the usual operator precedence. Explanation

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b: They always indicate that the expression is postfix. Explanation

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c: They remove the need for operands. Explanation

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d: They convert every operator into a unary operator. Explanation

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9. Which of the following is a valid postfix expression for

(a+b)*c-d

a: ab+c*d- Explanation

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b: abc+*d- Explanation

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c: ab+c-d* Explanation

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d: a+b*c-d Explanation

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Infix and Postfix