To allocate memory dynamically in the heap, we use the function with identifier

$.$ The type of return value of this function is

which points to the beginning of the memory block allocated in the heap. This function has one input parameter of type size$\_$t $($unsigned integer$)$ representing the number of bytes that you want to allocate. To dynamically allocate memory for a string of characters, the return value of this function must be explicitly cast $($converted$)$ to the type

$.$ To deallocate this memory block, we need to call a function with identifier

$.$