A static function is a function whose scope is limited to the current source file. Scope refers to the visibility of a function or variable. If the function or variable is visible outside of the current source file, it is said to have global, or external, scope. If the function or variable is not visible outside of the current source file, it is said to have local, or static, scope.

A sequence point is loosely referred as the point at which an expression is evaluated and all the objects involved in that expression are assigned their fresh values.

Wild pointers are also known as Dangling pointers. Pointers that do not point to a valid object of the appropriate type, or to a distinguished null pointers value in language which support this.

Because array index shows distance from the 1st element. Since the first element is zero distance away from itself, index starts from zero. The next element will be "index*scaling factor" distance away from 1st element. In case of integer array next elements will be  1*2, 2*2, 3*2, 4*2, .................bytes  away from the first element .

itoa() is used to convert integer to string.