C Programming Questions and Answers on Static Variables for Freshers

1. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         m();

5.         m();

6.     }

7.     void m()

8.     {

9.         static int x = 5;

10.         x++;

11.         printf("%d", x);

12.     }

a) 6 7
b) 6 6
c) 5 5
d) 5 6

Answer: a

2. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         static int x;

5.         printf("x is %d", x);

6.     }

a) 0
b) 1
c) Junk value
d) Run time error

Answer: a

3. What is the output of this C code?

1.     #include 

2.     static int x;

3.     void main()

4.     {

5.         int x;

6.         printf("x is %d", x);

7.     }

a) 0
b) Junkvalue
c) Run time error
d) Nothing

Answer: b

4. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         static double x;

5.         int x;

6.         printf("x is %d", x);

7.     }

a) Nothing
b) 0
c) Compile time error
d) Junkvalue

Answer: c

5. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         static int x;

5.         if (x++ < 2)

6.         main();

7.     }

a) Infinite calls to main
b) Run time error
c) Varies
d) main is called twice

Answer: d

6. Which of following is not accepted in C?

a) static a = 10; //static as
b) static int func (int); //parameter as static
c) static static int a; //a static variable prefixed with static
d) all of the mentioned

Answer: c

7. Which of the following cannot be static in C?

a) Variables
b) Functions
c) Structures
d) None of the mentioned

Answer: d

8. What is the output of code given below if these two files are linked and run?
in file test.c

1.     #include 

2.     #include "test.h"

3.     int main()

4.     {

5.         i = 10;

6.         printf("%d ", i);

7.         foo();

8.     }

10.     in file test1.c

11.     #include 

12.     #include "test.h"

13.     int foo()

14.     {

15.         printf("%d\n", i);

16.     }

18.     in file test.h

19.     #include 

20.     #include 

21.     static int i;

a) 1 0 0
b) 0 0
c) 10 10
d) None of the mentioned

Answer: d

9. Functions have static qualifier for its declaration by default.

a) true
b) false
c) Depends on the compiler
d) Depends on the standard

Answer: b

10. Is initialisation mandatory for local static variables?

a) Yes
b) No
c) Depends on the compiler
d) Depends on the standard

Answer: b

11. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         foo();

5.         foo();

6.     }

7.     void foo()

8.     {

9.         int i = 11;

10.         printf("%d ", i);

11.         static int j = 12;

12.         j = j + 1;

13.         printf("%d\n", j);

14.     }

a) 11 12 11 12
b) 11 13 11 14
c) 11 12 11 13
d) Compile time error

Answer: b

12. Assignment statements assigning value to local static variables are executed only once

a) true
b) false
c) Depends on the code
d) None of the mentioned

Answer: b

13. What is the format identifier for “static a = 20.5;”?

a) %s
b) %d
c) %f
d) Illegal declaration due to absence of data type

Answer: b

14. Which of the following is true for static variable?

a) It can be called from another function.
b) It exists even after the function ends.
c) It can be modified in another function by sending it as a parameter.
d) All of the mentioned

Answer: b

15. Comment on the output of this C code?

1.     #include 

2.     void func();

3.     int main()

4.     {

5.         static int b = 20;

6.         func();

7.     }

8.     void func()

9.     {

10.         static int b;

11.         printf("%d", b);

12.     }

a) Output will be 0
b) Output will be 20
c) Output will be a garbage value
d) Compile time error due to redeclaration of static variable

Answer: a