Sonata Placement Paper -: Technical Questions With Answers

Sonata Previous Years Solved Sample Placement Papers

1. 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

2. Solution: The variable a is redeclared within the same scope, which is not allowed.
3. 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

4. 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

5. 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.
6. 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

7. Solution: A switch statement only accepts constants or constant expressions as arguments; strings are not valid.
8. 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

9. Solution: The function calls itself recursively without any termination condition, leading to stack overflow eventually.
10. 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

11. Solution: Both forms are valid ways of allocating memory for a char pointer.
12. 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

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