Write a C program to calculate and display the sum of two numbers x and y. The result is stored in z. Your program should prompt the user to enter the two numbers and then call a function named summation to add the two numbers. The addresses of x, y, and z must be passed as parameters to the function summation.

Modify your program to include a function named avg which calculates and returns the average of the two numbers. The addresses of x, y, and z must be passed as parameters to the function avg.

3. Modify your program to include a function named maxm which finds and returns the max of the two numbers. The addresses of x, y, and z must be passed as parameters to the function maxm.

Write a program that reads an array of integers of size n and sort the elements using pointers and array. The program should contain a function with a pointer parameter then sort the array