Count the Vowel

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Introduction In this lab, you will learn how to use String methods in Python. Problem Write a Python program that counts the number of vowels in a String given by the user.

Step 1:

First, we need 3 variables:

• input - holding the user's input
• done - control the while loop
• vowelCount - count the number of vowel

 done = False
vowelCount = 0 

Step 2:

Second, we need get the input using raw_input(prompt).

 #get the input from user
input = raw_input("Enter a sentence")

if input != '': 

Step 3:

Third, we need to check the vowel.

 input = input.lower()
for char in inputs:
  #//check if it's a vowel
  if char == 'a' : 

Step 4:

Then we need to use while loop to print the output.

 while(!done):
  (...)
  #output result
  print '\nVowel count: %d\nVowel percentage: %d%%' % \
  (vowelCount, vowelCount * 100 / leng(input)) 

After this, we're done. You should now be able write a complete program that counts the number of vowels in a String given by the user.

SolutionCode

 def main():
  done = False
  vowelCount = 0

  while(!done):
    input = raw_input("Enter a sentence")
    
    if input == '':
      done = True
    else:
      #convert input to lower case
      input = input.lower()
      for char in inputs:
        #//check if it's a vowel
        if char == 'a' or char == 'e' or char == 'i' or char == 'o' or char == 'u' :
          vowelCount++;     #increase vowel count

      print '\nVowel count: %d\nVowel percentage: %d%%' % \
            (vowelCount, vowelCount * 100 / len(input))

main()