Write a program that finds the grade corresponding to the average mark. The program uses a function called average(int) that takes an integer representing the number of marks, then the function reads the marks and returns their average. Write another function called grade(double) that takes a double representing the average of marks, and returns a character, which is the average grade. Write a main function which calls the two functions average(int) and grade(double) and prints the grade of the marks. Sample input / output:

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