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Microprocessors - Engineering

Q1:

Consider the following statements about Infix and Post fix notations in Pascal
  1. In Infix notation operators appear between the operands on which they operate.
  2. In Post fix notation operators appear after the operand.
  3. The Infix expression A + B - C + D will appear as AB + C - D + in post fix notation.
Which of the above are correct?

A All

B 1 and 2 only

C 1 and 3 only

D 2 and 3 only

ANS:A - All

All are correct.