# Math πrate has been successful with the Numbers quest and is extremely thankful to you
# Next he has to take up the quest with strings
# Are you ready to help him? 

'''Task 1: Get Looping '''
print("**** Task 1: ****")
print()
# Math πrate is in the next step of the quest, where using a for loop, he needs to print out each individual character in a string. 
# As a trial, he has to run the program given below, analyze and then take up the next set of tasks.
# Ready to help him?
# Uncomment the statements below and click on Run
text = "Looping"
for c in text:
 print(c,end=",")

# What exactly happened in the program?
# The instruction was as simple as “for each character c in the variable text, print c“
# For loops can iterate over a string, just like it does with numbers
# Try changing “Looping” into any other word in the program and try
# If you notice, the characters are being displayed, one below the other.
# What if you want to display the characters, next to each other separated by a comma like:
# L,o,o,p,i,n,g
# For this all you need to do is add the following code in the print # statement like:
# print(c,end=",")
# Make this change in the program and run it.
# Did you get the output?

'''Task 2: Character Delimiter '''
print("\n**** Task 2: ****")
print()
# Math πrate  is really enjoying his quest 
# Now he has to uncomment the statements below and analyze the output
print("**** Your  Challenge *****")
name=input("Enter your name: ")
for c in name:
 print(c,end="@")
 print(c)

'''Task 3: Find me if you can '''
print("**** Task 3: ****")
print()
# Have you worked with MS-Word? 
# If you have to find a word in a MS-Word document, which menu option would you use? 
# Lets try that in Python
# Write a program that takes the following input from the user:
# Any word, for example, plant
# A character to search in the word 
# The program needs to display the number of occurrences of the character searched for. [Hint: Use a counter variable]
# Now try the program by inputting a sentence and then searching for a character
# Did it work?
def count_character():
    word = input("Enter any word or sentence: ")
    char = input("Enter the character to search for: ")
    count = 0
    for c in word:
        if c == char:
            count += 1
    print(f"\nThe character '{char}' appears {count} times in your input.")

count_character()

'''Task 4: You’ve got a mail '''
print("**** Task 4: ****")
print()
# Math πrate cracked the previous quest with your help He now has to write a program that asks the user to enter the email address for a promotional fun event
# The program needs to check if the email address entered is valid.[Hint: check if the user has used the character “@” only once] 
def validate_email():
    email = input("Enter your email address for the promotional event: ")
    
    if email.count("@") == 1:
        print("Valid email address.")
    else:
        print("Invalid email address. The '@' character must be used exactly once.")

validate_email()


'''Task 5: What's in a name  '''
print("**** Task 5: ****")
print()
# Math πrate has to write a program that accepts a username and email address.
# The user name entered should have either “$” or ”#” character. If not, an error message should be displayed
# If the user name entered is valid, only then can the user enter the email address
def registration():
    username = input("Enter your username: ")
    
    if "$" in username or "#" in username:
        email = input("Enter your email address: ")
        print("Registration successful.")
    else:
        print("Error: Username must contain either '$' or '#' character.")

registration()




'''Awesome work with the strings. You are now comfortable using the for loop with numbers and strings.'''