C/C++ Interview Questions

1. How do you decide which integer type to use?

2. What should the 64-bit integer type on new, 64-bit machines be?

3. What’s the best way to declare and define global variables?

4. What does extern mean in a function declaration?

5. What’s the auto keyword good for?

6. I can’t seem to define a linked list node which contains a pointer to itself.

7. How do I declare an array of N pointers to functions returning pointers to functions returning pointers to characters?

8. How can I declare a function that returns a pointer to a function of its own type?

9. My compiler is complaining about an invalid redeclaration of a function, but I only define it once and call it once. What’s happening?

10. What can I safely assume about the initial values of variables which are not explicitly initialized?

  C QUESTIONS                 

1. How do you write a program which produces its own source code as its output?

2. How can I find the day of the week given the date?

3. Why doesn’t C have nested functions?

4. What is the most efficient way to count the number of bits which are set in a value?

5. How can I convert integers to binary or hexadecimal?

6. How can I call a function, given its name as a string?

7. How do I access command-line arguments?

8. How can I return multiple values from a function?

9. How can I invoke another program from within a C program?

10. How can I access memory located at a certain address?

11. How can I allocate arrays or structures bigger than 64K?

12. How can I find out how much memory is available?

13. How can I read a directory in a C program?

14. How can I increase the allowable number of simultaneously open files?

15. What’s wrong with the call fopen(”c:\newdir\file.dat”, “r”)?