Function

18.1. Write a function that gets two integers and returns sum.

18.2. Write a function that gets two integers and returns sum.

18.3. Write a function that gets two integers and returns division.

18.4. Write a function that gets two integers and returns maximum.

18.5. Write a function that gets two integers and returns minimum.

18.6. Write a function that gets length and width of a rectangle and returns area.

18.7. Write a function that gets radius of a circle and returns area.

18.8. Write a function that gets three numbers and returns maximum.

18.9. Write a function that gets three numbers and returns minimum.

18.10. Write a function that gets three numbers and returns medium.

18.11. Write a function that gets any positive integer and returns its factorial.

18.12. Write a function that gets any positive integer and returns its digital sum.

18.13. Write a function that gets any positive integer and returns digital root.

18.14. Write a function that gets any positive integer and returns its reverse.

18.15. Write a function that gets two positive returns GCD (greatest common divisor).

18.16. Write a function that gets two positive integers and returns LCM (least common multiple).

18.17. Write a function that gets two positive integers(a, b) and returns a to the power b.

18.18. Write a function that gets two positive integers and returns nPr (Permutation).

18.19. Write a function that gets two positive integers and returns nCr (Combination).

18.20. Write a function that gets any positive integer and determine prime or not prime.

18.21. Write a function that gets an array and returns sum.

18.22. Write a function that gets an array and returns average.

18.23. Write a function that gets an array and returns maximum.

18.24. Write a function that gets an array and returns minimum.

18.25. Write a function that searches any number in an array.

18.26. Write a function that sorts an array.

18.27. Write a function that gets a string and returns its length.

18.28. Write a function that gets a string and reverses all characters.

18.29. Write a program that gets a string and convert it to upper case.

18.30. Write a function that gets a string and convert it to lower case.

18.31. Write a function that copies one string over another string.