# Evaluation of a Prefix Expression Multiple choice Questions and Answers (MCQs)

## Evaluation of a Prefix Expression Multiple choice Questions and Answers (MCQs)

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 Question 6 [CLICK ON ANY COICE TO KNOW RIGHT ANSWER]
Find the output of the following prefix expression

*+2-2 1/-4 2+-5 3 1

 A 2 B 12 C 10 D 4
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Question 6 Explanation:
The given prefix expression is evaluated using two stacks and the value is given by (2+2-1)*(4-2)/(5-3+1)= 2.

 Question 7 [CLICK ON ANY COICE TO KNOW RIGHT ANSWER]
An error is thrown if the character '\n' is pushed in to the character stack.
 A true B false
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Question 7 Explanation:
The input character '\n' is accepted as a character by the evaluation of prefix expression algorithm.

 Question 8 [CLICK ON ANY COICE TO KNOW RIGHT ANSWER]
Using the evaluation of prefix algorithm, evaluate +-9 2 7.
 A 10 B 4 C 17 D 14
Question 8 Explanation:
Using the evaluation of prefix algorithm, +-9 2 7 is evaluated as 9-2+7=14.

 Question 9 [CLICK ON ANY COICE TO KNOW RIGHT ANSWER]
If -*+abcd = 11, find a, b, c, d using evaluation of prefix algorithm.
 A a=2, b=3, c=5, d=4 B a=1, b=2, c=5, d=4 C a=5, b=4, c=7, d=5 D a=1, b=2, c=3, d=4
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Question 9 Explanation:
The given prefix expression is evaluated as ((1+2)*5)-4 =11 while a=1, b=2, c=5, d=4.

 Question 10 [CLICK ON ANY COICE TO KNOW RIGHT ANSWER]
In the given C snippet, find the statement number that has error.

//C code to push an element into a stack

1. void push( struct stack *s,  int x) 2. { 3. if(s->top==MAX-1) 4. { 5. printf("stack overflow"); 6. } 7. else 8. { 9. s->items[++s->top]=x; 10. s++; 11. } 12.}
 A 1 B 9 C 10 D 11
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Question 10 Explanation:
The stack's top position is incremented twice at the same time. So, when the next element is pushed, there is unit gap between this element and the previous element.

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