VIRTUSA Placement Paper -: Technical Questions And Answers

VIRTUSA Previous Years Solved Sample Placement Papers

1. What is the difference between the following declarations?

   const char *s;

   char const *s;

   Ans. No difference

2. What would be the output of the following program?

   
   main() {
     char near * near *ptr1;
     char near * far *ptr2;
     char near * huge *ptr3;
     printf("%d %d %d", sizeof(ptr1), sizeof(ptr2), sizeof(ptr3));
   }
       

   A. 1 1 1

   B. 1 2 4

   C. 2 4 4

   D. 4 4 4 Answer: Option D

3. What error would the following function give on compilation?
   

   f(int a, int b)
   {
       int a;
       a=20;
       return a;
   }

   A. missing parenthesis in the return statement

   B. The function should be declared as int f(int a, int b)

   C. redeclaration of a Answer: Option C

   D. None of the above

4. Solution: The variable a is redeclared within the same scope, which is not allowed.
5. Point out the error in the following program:
   

   main()
   {
       const char *fun();
       *fun()='A';
   }
   const char *fun()
   {
       return "Hello";
   }

   Ans: fun() returns to a const char pointer which cannot be modified

6. What would be the output of the following program?
   

   main()
   {
       const int x=5;
       int *ptrx;
       ptrx=&x;
       *ptrx=10;
       printf("%d",x);
   }

   A. 5

   B. 10

   C. Error

   D. Garbage value Answer: Option A

7. Solution: Attempting to modify a constant variable through a pointer will not change its value in most compilers, but it is undefined behavior. The program prints the original value of x, which is 5.
8. A switch statement cannot include:
   

   A. constants as arguments

   B. constant expression as arguments

   C. string as an argument Answer: Option C

   D. None of the above

9. Solution: A switch statement only accepts constants or constant expressions as arguments; strings are not valid.
10. How long will the following program run?
    

    main()
    {
        printf("\nSonata Software");
        main();
    }

    A. infinite loop

    B. until the stack overflows Answer: Option B

    C. All of the above

    D. None of the above

11. Solution: The function calls itself recursively without any termination condition, leading to stack overflow eventually.
12. On combining the following statements, you will get char *p; p=malloc(100);
    

    A. char *p= malloc(100)

    B. p= (char*)malloc(100)

    C. All of the above Answer: Option C

    D. None of the above

13. Solution: Both forms are valid ways of allocating memory for a char pointer.
14. What is the output of the following program?
    

    main()
    {
        int n=5;
        printf("\nn=%*d",n,n);
    }

    A. n=5

    B. n= 5 Answer: Option B

    C. n=5

    D. error

15. Solution: The %*d format specifier dynamically sets the field width, which in this case is the value of n.

16. In the following code, in which order the functions would be called?

    a = f1(23, 14) * f2(12 / 4) + f3();

    A. f1, f2, f3

    B. f3, f2, f1

    C. The order may vary from compiler to compiler Answer: Option C

    D. None of the above

17. What would be the output of the following program?

    
    main() {
      int i = 4;
      switch (i) {
        default:
          printf("\n A mouse is an elephant built by the Japanese");
        case 1:
          printf(" Breeding rabbits is a hare raising experience");
          break;
        case 2:
          printf("\n Friction is a drag");
          break;
        case 3:
          printf("\n If practice makes perfect, then nobody's perfect");
      }
    }
        

    A. A mouse is an elephant built by the Japanese

    B. Breeding rabbits is a hare raising experience

    C. All of the above

    D. None of the above Answer: Option D

18. What is the output of the following program?

    
    #define SQR(x) (x * x)
    main() {
      int a, b = 3;
      a = SQR(b + 2);
      printf("%d", a);
    }
        

    A. 25 Answer: Option A

    B. 11

    C. error

    D. garbage value

19. In which line of the following, an error would be reported?

    
    #define CIRCUM(R) (3.14 * R * R)
    main() {
      float r = 1.0, c;
      c = CIRCUM(r);
      printf("\n%f", c);
      if (CIRCUM(r) == 6.28)
        printf("\nGobbledygook");
    }
        

    A. line 1

    B. line 5

    C. line 6

    D. line 7 Answer: Option D

20. What is the type of the variable b in the following declaration?

    
    #define FLOATPTR float *
    FLOATPTR a, b;
        

    A. float

    B. float pointer Answer: Option B

    C. int

    D. int pointer

21. In the following code:

    
    #include 
    main() {
      FILE *fp;
      fp = fopen("trial", "r");
    }
        

    fp points to:

    A. The first character in the file.

    B. A structure which contains a "char" pointer which points to the first character in the file. Answer: Option B

    C. The name of the file.

    D. None of the above.

22. We should not read after a write to a file without an intervening call to fflush(), fseek(), or rewind(). TRUE/FALSE

    Ans. True

23. If the program (myprog) is run from the command line as myprog 1 2 3, What would be the output?

    
    main(int argc, char *argv[]) {
      int i;
      for (i = 0; i < argc; i++)
        printf("%s", argv[i]);
    }
        

    A. 1 2 3

    B. C:\\MYPROG.EXE 1 2 3 Answer: Option B

    C. MYP

    D. None of the above

24. In how many different ways can the letters of the word 'DETAIL' be arranged in such a way that the vowels occupy only the odd positions?
    

    A. 32

    B. 48

    C. 36 Ans: C

    D. 60

    E. 120

25. What is the ratio of the peak ripple voltage level to its rms voltage level?
    

    v3 Ans: A

    v2

    v3/2

    v2/2

26. In an improved shunt regulator, which of the following components sets the reference voltage?
    

    A. Transistor Q1

    B. Zener diode Ans: B

    C. Transistor Q2

    D. RS