C Interview Questions

Here I post some basic C Interview questions.Most of the MNC are required only basic C quetions....

C Interview Questions

1. Describe about storage allocation and scope of global, extern, static, local and register variables?

2. Can we specify variable field width in a scanf() format string? If possible how?

3. What are the advantages of using pointers in a program?

4. Are the expressions arr and &arr same for an array of integers?

5. Can a Structure contain a Pointer to itself? Give an example

6. Why is my compiler complaining about an invalid redeclaration of a function that I define and call only once?

7. What is the difference between the following two declarations? Explain

Char a[];
Char *a;

8. What is the difference between arrays and pointers?

9. How can you determine the number of elements in an array, when sizeof yields the size in bytes?

10. I want to split a program into multiple source files. How should I do it?

11. What are header (“#include”) files searched for?

12. Can you convert numbers to strings? If so, how?

13. Write a program to count the number of words in a given file.

14. Write a program to extract a given word from a file.

15. Write a function to simulate the printf function in C

16. Examine the following code and explain.

For (I = start; I <> 7322
7322 seconds is equivalent to 2 hours 2 minutes 2 seconds.
Enter the number of seconds> 500

31. Write a program that reads in five integers and then determines and prints the largest and the smallest integers in the group.

32. Write a program to remove all comments from a C program.

33. Write a program that removes words from its input. The removed words are given as command line arguments. Write a function char *remove(char *line, char *word); that removes a word from a line. Be prepared to handle several removable words.

34. Write a program to copy its input to its output, replacing each tab by \t, and each backslash by \\. This makes tabs visible in an unambiguous way.

35. Write a program to read through an array of any type using pointer. Write a C program to scan through this array to find a particular value.