Frequently Asked Questions on Arrays and Pointers

Frequently Asked Questions on Arrays and Pointers, FAQ on Array and pointers, Pointers FAQ, FAQ on Array, Array Pointers interview Questions

• I had the definition char a[6] in one source file, and in another I declared extern char *a. Why didn't it work?
• But I heard that char a[] was identical to char *a.
• So what is meant by the ``equivalence of pointers and arrays'' in C?
• If they're so different, then why are array and pointer declarations interchangeable as function formal parameters?
• So arrays are passed by reference, even though the rest of C uses pass by value?
• Someone explained to me that arrays were really just constant pointers.
• I'm still mystified. Is a pointer a kind of array, or is an array a kind of pointer?
• I came across some ``joke'' code containing the ``expression'' 5["abcdef"] . How can this be legal C?
• Since array references decay into pointers, if arr is an array, what's the difference between arr and &arr?
• How do I declare a pointer to an array?
• How can I set an array's size at run time?
• How can I avoid fixed-sized arrays?
• How can I declare local arrays of a size matching a passed-in array?
• How can I dynamically allocate a multidimensional array?