A certain CS professor gives five-point quizzes that are graded on the scale: 5→A4→B3→C2→D1→E0→E5→A4→B3→C2→D1→E0→ E
Complete a program that accepts a quiz score as an input, and uses decision structures to calculate the corresponding grade. Do this by implementing the functions, below:
num_to_letter(num)
Given a numerical grade between 0 and 5, return the appropriate letter grade.
main()
Write a main() asks the user for a numerical score between 0 and 5, and prints out the letter grade. You must use your num_to_letter function as defined above.
Tip 1: Fractional scores are allowed, e. g. a score of "4.5" is a "B" grade, or "1.7" is an "E". So make appropriate comparisons in your conditions.*
Tip 2: Scores could possibly be less than 0, or greater than 5. Just assign it an ‘E’, or ‘A’ respectively.
Output
For example, if the score of 5 is entered, a letter grade of "A" is returned.
Enter a numerical score (0-5): 5
Grade is A

Write a modular program (no classes yet, just from what you learned last year), that allows two players to play a game of tic-tac-toe. use a two-dimensional char array with 3 rows and 3 columns as the game board. each element of the array should be initialized with an asterisk (*). the program should display the initial board configuration and then start a loop that does the following: allow player 1 to select a location on the board for an x by entering a row and column number. then redisplay the board with an x replacing the * in the chosen location. if there is no winner yet and the board is not yet full, allow player 2 to select a location on the board for an o by entering a row and column number. then redisplay the board with an o replacing the * in the chosen location. the loop should continue until a player has won or a tie has occurred, then display a message indicating who won, or reporting that a tie occurred. player 1 wins when there are three xs in a row, a column, or a diagonal on the game board. player 2 wins when there are three ox in a row, a column, or a diagonal on the game board. a tie occurs when all of the locations on the board are full, but there is no winner. input validation: only allow legal moves to be entered. the row must be 1, 2, or 3. the column must be 1, 2 3. the (row, column) position entered must currently be empty (i. e., still have an asterisk in it).

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