PROGRAM -3: Write a Java program to read an integer number and print its factorial. PROGRAM -4: Write a Java program to read n marks for n students along with their names then find and print the following: 1- The class average 2- The name and mark of the highest student mark 3- Number of students above the average. 4-Use switch statement to convert the mark into points as follows: If the mark is between 90 and 100 print A If the mark is between 80 and 89 print B If the mark is between 70 and 79 print C If the mark is between 60 and 69 print D If the mark is between 0 and 59 print F Otherwise print "Invalid mark