Do it in C, fix the code, answer the questions and explain them in detail

#include /* Read a set of values from the user. Store the sum in the sum variable and return the number of values read. */ // You CANNOT declare any global variables // You CANNOT change the definition of the read_values function (e.g., add/remove function parameters, or change the return type) int read_values(double sum) { int values = 0, input = 0; sum = 0; printf("Enter input values (enter 0 to finish): "); scanf("%d", &input); while(input != 0) { values++; sum += input; scanf("%d", input); } return values; } int main() { double sum = 0; int values; values = read_values(sum); printf(" Average: %g ", sum/values); // Hint: How do we ensure that sum is updated here AFTER read_value manipulates it? return 0; }