Programs to try - Strings in R - Assignment 4

 Program List

1.Check whether the given string is palindrome
2.Count the Number of Vowels in a String
3.Count Uppercase, Lowercase, Digits and Special Characters
4.Count the number of words and legth of each words
5.Find the frequency of each character
6.Check for a substring
7.Write a R program to check the validity of a password given by the user. 
The Password should satisfy the following criteria:
    1. Contains at least one letter between a and z
    2. Contains at least one number between 0 and 9
    3. Contains at least one letter between A and Z
    4. Contains at least one special character from $, #, @
    5.Minimum length of password: 6

8.Encrypt a string using the shift cipher( key=3 Ceaser cipher). Do both encryption and decryption.

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