Copying a 4 element character array into an integer in C

Question

A char is 1 byte and an integer is 4 bytes. I want to copy byte-by-byte from a char[4] into an integer. I thought of different methods but I\'m getting different answers.

Answer 1

unsigned int a = *(unsigned int*)str;

This initialization is not correct and invokes undefined behavior. It violates C aliasing rules an potentially violates processor alignment.