1. Look at the code below. Describe how the malloc function is used. What does the free function do?

#include

struct rec

int i;

float PI;

char A;

int main()

struct rec *ptr_one;

ptr_one = (struct rec *) malloc (sizeof(struct rec));

ptr_one->i = 10;

ptr_one->PI = 3.14;

ptr_one->A = a;

printf(First value: %d , ptr_one->i);

printf(Second value: %f , ptr_one->PI);

printf(Third value: %c , ptr_one->A);

free(ptr_one);

return 0;

}

2. You are to write a program that will use a linked list to store student information of three students. The information about each student consists of i) Student First Name, ii) Student last name, iii) Student id number, and iv) Students major. Develop a structure that will be used to build the list.

3. Write a program that will calculate the factorial of a positive integer n (n!). The program should receive the integer using command line arguments. Use a recursive function to compute the factorial value.