Training Project: calculator

This is a calculator It is supposed to take commands on the form of awesomecalculator add 3 5
and the output would be 8
so argv[1] is the operation. ex. add, subtract, multiply, divide, absolute, negate, power, root, log, ln, factorial, sin, cos and tan.
argv[2] and argv[3] are the operands.
everyone can implement one operation function.
and someone will implement the main function body.
if all functions were already implemented, come up with a new one and make it :D

People who have contributed to the project so far:

1. Eslam Romario
2. Mohamed Medhat
3. Omar Alsawaf
4. Abdo Alaa
5. Yasmin Ghazy
6. Yara Yasser
7. Saieed Osama
8. Omneya Yahya
9. Sara Rabie
10. Omar M. Ali