Create a C function that will function that will decompose a double value into an integer part and a fractional part.This function will need to return two parts: an integer part and a fractional part.

In C++

In C++: Write a function which will find the average of all elements of the sequence: {2, 4, 6, 8, 10, 12}. Use call by reference, and return the average as the function's return value.

Write a complete C++ program that helps the teacher to calculate the result of students in the test of Programming Technique. The program should perform the following tasks: Task 1: Write a function named getInput. a) This is a non-returning function. b) It takes the score of question 1, score of question 2, and score of question 3 as input parameters. c) The function should ask the user to enter the score (per 100) for each question. It sends all the values entered by the user in (c) back to the calling module through the use of reference parameters. d)

3. Using c++ Write a function that accepts an integer n and returns -1 if n is less than zero and the sum of all the integers between 0 and n (inclusive) if n is greater than or equal to zero.