Using C Programming

Write a program that implements a recursive 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 will take a number from the user, use a recursive function to find out the sum of the digits of that numbers and display the sum on the screen. Q.3 Write a program which implements a recursive function to check if a number is a prime or not. Again the main part of the program will just take the input from the user and call the recursive function with user input passed as a parameter.