How to create a dynamic array of characters (the size of the array is determined during input) in C?

Answer 1, authority 100%

There are no dynamic arrays in C itself, but the functions of the standard library malloc, free and realloc allow you to implement an array of variable size:

int * mas = (int *) malloc (sizeof (int) * n); // Create an array of n elements of type int
 ...
 mas = (int *) realloc (mas, sizeof (int) * m); // Resize the array from n to m while preserving the contents
 ...
 free (mas); // Free memory after using the array

The disadvantage of this approach is the need to calculate the size of the allocated memory, apply an explicit type conversion, and carefully monitor the lifetime of the array (as is always the case when working with dynamically allocated memory in C).

Dynamic memory allocation should help.