Difference between revisions of "Count the Vowel"
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{{Template:1010ExtraLabs | {{Template:1010ExtraLabs | ||
|Chapter_TOC=[[Extra Labs]] | |Chapter_TOC=[[Extra Labs]] | ||
| − | | | + | |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. | ||
|Body= | |Body= | ||
| − | |||
| + | ===Step 1:=== | ||
First, we need 3 variables: | First, we need 3 variables: | ||
| − | + | ||
| − | + | * input - holding the user's input | |
| − | + | * done - control the while loop | |
| + | * vowelCount - count the number of vowel | ||
| + | |||
{{CodeBlock | {{CodeBlock | ||
|Code= | |Code= | ||
| Line 16: | Line 19: | ||
}}<br /> | }}<br /> | ||
| + | ===Step 2:=== | ||
| + | Second, we need get the input using raw_input(prompt). | ||
| − | |||
{{CodeBlock | {{CodeBlock | ||
|Code= | |Code= | ||
| Line 23: | Line 27: | ||
input = raw_input("Enter a sentence") | input = raw_input("Enter a sentence") | ||
| − | if input != ' ': | + | if input != '': |
}}<br /> | }}<br /> | ||
| − | + | ===Step 3:=== | |
| + | Third, we need to check the vowel. | ||
{{CodeBlock | {{CodeBlock | ||
|Code= | |Code= | ||
| Line 35: | Line 40: | ||
}}<br /> | }}<br /> | ||
| − | Then we need to use while loop to print the output | + | ===Step 4:=== |
| + | Then we need to use while loop to print the output. | ||
{{CodeBlock | {{CodeBlock | ||
| Line 42: | Line 48: | ||
(...) | (...) | ||
#output result | #output result | ||
| − | + | print '\nVowel count: %d\nVowel percentage: %d%%' % \ | |
| + | (vowelCount, vowelCount * 100 / leng(input)) | ||
| + | |||
}}<br /> | }}<br /> | ||
| + | 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== | ||
| + | {{OutputBlock | ||
| + | |Code= | ||
| + | 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() | ||
| + | }} | ||
}} | }} | ||
Latest revision as of 03:21, 5 April 2012
COMP 1010 Home > Back to Extra Labs
IntroductionIn this lab, you will learn how to use String methods in Python. ProblemWrite 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()
