Please, explain clearly each line of code.

how can I declare the following array functions:

/** * Adds a random element to the array. * @param a[] the array of integers * @param capacity of the array * @param n new size of the array */ void add_element(int a[], int capacity, int& n); /** * Removes the all zeros from the array. * @param a[] the array of integers * @param n new size of the array */ void remove_all_zeros(int a[], int& n); // see Shelf Check 6.3 for pseudocode on // removing all matching values from a partially filled array /** * Prints the array a[] to the screen with comma separator * @param a[] the array of integers * @param n size of the array */ void display_array(const int a[], int n); /** * Returns true if array a[] has no duplicates and false otherwise. * @param a[] the array of integers * @param n size of the array * @return true if array a[] has no duplicates, and * false otherwise. */ bool no_duplicates(const int a[], int n); /** * Returns the index of where x is in array a[], -1 * otherwise. This is similar to a linear search. * @param a[] the array of integers * @param n size of the array * @param x the integer to locate in the array * @return the index of x if x is in the array a[], -1 otherwise. */ int locate_value(const int a[], int n, int x);