مساعدة ضروريي بلغة ال c++

السلام عليكم ورحمة الله وبركاته
اخواني محتاجي مساعدة ضروريي بلغة ال C++
عندي مجموعة اسئلة وحتاجي جوابها كثير
لو ممكن تساعدوني بكون ممنونة

write a c++ program that consists of the following menue:
1. conversion
a. bin to oct
b. oct to bin
c. hex to bin
d. bin to hex
e. hex to oct
2. trigonometric functions
a. cos(x)
b. sin(x)

3. Especial code
a. fibonancci series : 0,1,1,2,3,5,8,13,21,34,…
note that 0+1=1, 1+1=2 and 1+2=3 and 2+3=5, …etc.
also note that the fibonancii of (0) = 0, fib(1)=1, fib(2)=1, fib(3)=2, fib(7)=13 and fib(9)=34 etc…

b. ATM system. the user should enter his username and password to use the ATM system. The ATM sys. consists of the following submenus:
* add money.
* withdraw money.
* account balance.
4. Exit