First time here? Checkout the FAQ!
+9 votes
Write $3$ address intermediate code (quadruples) for the following boolean expression in the sequence as it would be generated by a compiler. Partial evaluation of boolean expressions is not permitted. Assume the usual rules of precedence of the operators.

$$(a+b) > (c+d) \text{ or } a > c \text{ and }b < d$$
asked in Compiler Design by Veteran (73.4k points)   | 163 views

1 Answer

+15 votes
Best answer

Each instruction in quadruples presentation is divided into four fields: operator, arg1, arg2, and result. The above example is represented below in quadruples format:

(a+b)>(c+d)OR a>c AND b<d

(t1>t2)OR a>c AND b<d

t3 OR t4 AND t5

t3 OR t6


t1= a+b

t2= c+d

t3= t1>t2

t4= a>c

t5= b<d

t6= t4 AND t5

t7 =t3 OR t6

Op arg1 arg2 Result
+ a b t1
+ c d t2
> t1 t2 t3
.> a c t4
< b d t5
AND t4 t5 t6
OR t3 t6 t7


answered by Veteran (40.8k points)  
selected by
Top Users Jan 2017
  1. Debashish Deka

    8968 Points

  2. sudsho

    5326 Points

  3. Habibkhan

    4798 Points

  4. Bikram

    4532 Points

  5. Vijay Thakur

    4486 Points

  6. saurabh rai

    4222 Points

  7. Arjun

    4196 Points

  8. santhoshdevulapally

    3808 Points

  9. Sushant Gokhale

    3596 Points

  10. Kapil

    3486 Points

Monthly Topper: Rs. 500 gift card

19,212 questions
24,104 answers
20,319 users