Question

Paste this code into a new file and find the errors.  The most frequent letter in the user_string is H.

# Function displays the character that appears most frequently

# in the string. If several characters have the same highest

# frequency, displays the first character with that frequency.

def main():

    # Set up local variables

    count = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]

    letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

    index = 0

    frequent = 0

    # Receive user input.

    user_string = 'Who where what why how'

    for ch in user_string:

        ch = ch.lower()

        # Determine which letter this character is.

        index = letters.find(ch)

        if index >= 0:

            # Increase counting array for this letter.

           count[index] = count[index] + 1

    for i in range(len(count)):

        if count[i] > count[frequent]:

           frequent = i

    print('The character that appears most frequently' \

          ' in the string is ', letters[i], '.', \

          sep='')

# Call the main function.

main()

Answer 1

thanks for the question, you need to update two lines. have given my comments and updated the code

======================================================================================

def main():
    # Set up local variables
    count = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
    letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
    index = 0
    frequent = 0
    # Receive user input.
    user_string = 'Who where what why how'
    for ch in user_string:
        ch = ch.lower()
        # Determine which letter this character is.
        # updated the below line, we need to first convert letters to lower case
        # only then there will be a match , find() is case sensitive
        index = letters.lower().find(ch)
        if index >= 0:
            # Increase counting array for this letter.
           count[index] = count[index] + 1
    for i in range(len(count)):
        if count[i] > count[frequent]:
           frequent = i
            # this should be frequent, since the value of frequent is getting updated
            # updated the below line
    print('The character that appears most frequently in the string is ', letters[frequent], '.',
          sep='')
# Call the main function.
main()

=========================================================================================

thanks !