Interview Questions on Pointers in C

1. What is a pointer in C?
2. What are the advantages of using pointers?
3. How is pass by reference achieved using pointers in C?
4. What are the differences between malloc() and calloc()?
5. How to use realloc() to dynamically increase size of an already allocated array?
6. What is the equivalent pointer expression for referring an element a[i][j][k][l], in a four dimensional array?
7. Declare an array of three function pointers where each function receives two integers and returns float.
8. Explain the variable assignment in the declaration
   

   int *(*p[10])(char *, char *);
   

9. What is the value of
   

   sizeof(a) /sizeof(char *)

   in a code snippet:
   

   char *a[4]={"sridhar","raghava","shashi","srikanth"};

10. (i)What are the differences between the C statements below:
    

    char *str = "Hello";
    char arr[] = "Hello";
    

    (ii)Whether following statements get complied or not? Explain each statement.

    arr++;
    *(arr + 1) = 's';
    printf("%s",arr);
    

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