The following postfix expression with single digit operands is evaluated using a stack:

8 2 3 ^ / 2 3 * + 5 1 * –

Note that ^ is the exponentiation operator. The top two elements of the stack after the first * is evaluated are
(A) 6,1
(B) 5,7
(C) 3,2
(D) 1,5

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• Consider the following code fragment
  void foo(int x, int y)
  {
  x+=y;
  y+=x;
  }
  main()
  {
  int x=5.5;
  foo(x,x);
  }
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  (A) 5 and 16
  (B) 5 and 12
  (C) 5 and 20
  (D) 12 and 20
  
  

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  (b) Na > Li > K >Cs 

  (c) Li > Cs > K > Na 

  (d) K > Cs > Na > Li

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  (B) non-key and non-ordering
  (C) key and ordering
  (D) key and non-ordering
  
  

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• What is the number of steps required to derive the string ((() ()) ())

  S → SSS → (S)S → ε

  (A) 10
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  (C) 12
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