Dynamic array in C — Is my understanding of malloc and realloc correct?

Question

I am learning how to create dynamic 1D arrays in C. The code below tries to do the following:

1. Using malloc, create a dynamic array of length

Answer 1

In C, you should not cast the return value of malloc().

Also, it's a bad idea to encode the type in the malloc() argument. This is a better way:

double* data = malloc(10 * sizeof *data);