UGC NET CSE | June 2013 | Part 2 | Question: 29

Question

The value of postfix expression: 834+-382/+*2$3+ is

• A. 17
• B. 131
• C. 64
• D. 52

Answer 1

POSTFIX EVALUATION ALGO

1) push the operands  in stack when  operator X comes take top 2 values say A and B  and perform B X A and store the result at top  of stack

2)Repeat the procedure till end of expression

here push 8 3 4 now +comes 3+4=7 stack now contains 8 7 now - comes so 8-7=1 stack now has 1

push 3 8 2 now / comes perform 8/2=4 then +comes 3+4 =7 stack now has 1  7 then * comes stack now has 7*1=7

now push 2  $ (power )comes perform 7^2=49 push 3    +comes  stack now has 49 3 perform 49+3=52

hence final ans is D

Comments

ok thank you

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@sanjay and @leen how would you know 834 is a single no or 3 different numbers..

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if you consider 834 as a single number then can't apply + operation on it because + is a binary operator.

Answer 2

834+-382/+*2$3+

=87-382/+*2$3+

=1382/+*2$3+

=134+*2$3+

=17*2$3+

=72$3+

=49 3 +

=52

Hence,Option(D)52.