C | Storage Classes and Type Qualifiers | Question 14

What output will be generated by the given code d\\segment if: 
Line 1 is replaced by “auto int a = 1;” 
Line 2 is replaced by “register int a = 2;” (GATE CS 2012) 

(A)

3 1

4 1

4 2

(B)

4 2

6 1

6 1

(C)

4 2

6 2

2 0

(D)

4 2

4 2

2 0

Answer: (D)

Explanation:

If we replace line 1 by “auto int a = 1;” and line 2 by “register int a = 2;”, then ‘a’ becomes non-static in prtFun(). The output of first prtFun() remains same. But, the output of second prtFun() call is changed as a new instance of ‘a’ is created in second call. So “4 2″ is printed again. Finally, the printf() in main will print “2 0″. Making ‘a’ a register variable won’t change anything in output. 

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