Write a C++ program to extract a character from the word as defined below.

string word = "Computer";

Sample Output
Array index = 2
Content = m

Array index = 9
Out of range

Array index = 3
Content = p

:

Write a C++ program to extract a substring from the sentence as defined below.

string sentence = "Sacred Heart Canossian College";

Sample Output
Starting index = 7
Length of the substring = 5
Result = Heart

Starting index = 13
Length of the substring = 90
Length of the substring = 9
Result = Canossian

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Write a C++ program which counts the number of words in a sentence.

Sample Output
Enter a sentence: A fox kills a girl quickly but dies in the zoo afterwards.

Number of words = 12

Encryption is the conversion of data into a form, called a cipher text that cannot be easily understood by unauthorized people. Decryption is the process of converting encrypted data back into its original form, so it can be understood. Write a C program to generate the following sample output.

Sample Output
Plain text: computer network
Cipher text (Method 1): krowten retupmoc
Cipher text (Method 2): dpnqvufs ofuxpsl
Cipher text (Method 3): ocpmturen teowkr

Write a C++ program to generate an email address for a student with reference to her class and class number. Note: length of user name is 4 and strcat should be used in your program.

Sample Output
class : 6A
number : 1
email address: 6a01@shcc.edu.hk