Please explain each step

Using C Programming

1 Write a program that implements a function which can take a positive integer, N, and computes the sum of all the non-negative integers smaller or equal to N. For example, if you call the function with N=5, it will output 1+2+3+4+5=15. Note that the main part of your program will just have a function call. No other components need to be there in the main part. Q.2 Write a program that uses a function to take 5 integers from the user, store them in an array and display their average on the screen. Note that the main part of your program will just have a function call. No other components need to be there in the main part. Q.3 Write a program that will take 7 integers from the user, store them in an array. Write three functions which takes the aforementioned array as input and display them on the screen 1) in the order as they were entered, 2) in increasing order and 3) in the decreasing order. For instance if the input is: 13 -23 1 45 -2 16 -5 then the call to the first function will display: 13 -23 1 45 -2 16 -5, call to the second function will display: -23 -5 -2 1 13 16 45 Finally, call to the 3rd function will display: 45 16 13 1 -2 -5 -23.