22. Write an object-oriented program to read student’s name and his average marks. If a student gets less than 40 then declare that he has failed or else he passed. Prepare a computer list to give the...

22. Write an object-oriented program to read student’s name and his average marks. If a student gets less than 40 then declare that he has failed or else he passed. Prepare a computer list to give the list of names in alphabetical order separately for passed and failed students.

23. Write an object-oriented program to perform trigonometric operations on the complex numbers.

24. Write an object-oriented program to read a set of lines from stdin and store them in an array A; again read a string S from the stdin and check whether the given string S is in the array A. If it is so, print that line and also how many times it repeats in the array A.