Exercises

Write a program that will ask the user to input three numbers, then calculates and displays their sum and their average.

Write a program that will ask the user to input the length and the width of a rectangle, then calculates and displays the area and the perimeter of the rectangle.

Write a program that will ask the user to input an amount of money in dollars, then displays the same amount of money in dirhams.

Write a program that will open a file for reading, then reads a student first name, his course work mark $($out of $65),$ and his final exam mark $($out of $35).$ It will then open another file for writing and write the student first name, and his final mark $($out of $100)$

$12$

Do it in javascript all of it