The equivalent infix expression and value for the postfix form 1 2 + 3

1.	The equivalent infix expression and value for the postfix form 1 2 + 3 * 4 5 * – will be ___________(a) 1 + 2 * 3 – 4 * 5 and -13(b) (2 + 1) * (3 – 4) * 5 and 13(c) 1 + 2 * (3 – 4) * 5 and -11(d) (1 + 2) * 3 – (4 * 5) and -11My doubt stems from Application of Stacks topic in chapter Application of Stacks of Data Structures & Algorithms II have been asked this question in an interview for job.
Answer» CORRECT answer is (d) (1 + 2) * 3 – (4 * 5) and -11 Given postfix expression : 1 2 + 3 * 4 5 * – ⇒ (1 + 2) 3 * 4 5 * – ⇒ ((1 + 2) * 3) 4 5 * – ⇒ ((1 + 2) * 3) (4 * 5) – ⇒ ((1 + 2) * 3) – (4 * 5) So, the equivalent infix expression is (1 + 2) * 3 – (4 * 5) and it’s VALUE is -11.

The equivalent infix expression and value for the postfix form 1 2 + 3 * 4 5 * – will be ___________(a) 1 + 2 * 3 – 4 * 5 and -13(b) (2 + 1) * (3 – 4) * 5 and 13(c) 1 + 2 * (3 – 4) * 5 and -11(d) (1 + 2) * 3 – (4 * 5) and -11My doubt stems from Application of Stacks topic in chapter Application of Stacks of Data Structures & Algorithms II have been asked this question in an interview for job.

Answer»

CORRECT answer is (d) (1 + 2) * 3 – (4 * 5) and -11

Given postfix expression : 1 2 + 3 * 4 5 * –

⇒ (1 + 2) 3 * 4 5 * –

⇒ ((1 + 2) * 3) 4 5 * –

⇒ ((1 + 2) * 3) (4 * 5) –

⇒ ((1 + 2) * 3) – (4 * 5)

So, the equivalent infix expression is (1 + 2) * 3 – (4 * 5) and it’s VALUE is -11.

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