How to find out the percentage of vowels in a string?

Question

package scanner;
import java.util.Scanner;

public class GuessSentence {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.println("Type a sentence");
        String sentence = sc.nextLine();
        System.out.println("You entered the sentence " + sentence);
        System.out.println("The number of words in the sentence is " + sentence.length());

        char [] chars=sentence.toCharArray();

        int count = 0;
        for (char c : chars) {
            switch(c) {
            case 'a':
            case 'e':
            case 'i':
            case 'o':
            case 'u':
                count++;
                break;
            }
        }
        System.out.println("The numner of vowels in your sentence is " + count);
        System.out.println("The percentage of vowels is " + 100 * count /sentence.length() + "%" );
    }
}

Thank you to everyone who helped, I was able to get the correct outcome which i was looking for so i appreciate all the help recieved.

"_However, i do not get the percentage of vowels_" Well, it is there in the output `The percentage of vowels is 2%`. Do you mean that it is just not correct? — takendarkk, Nov 21 '18 at 17:36
Possible duplicate of [Why is the result of 1/3 == 0?](https://stackoverflow.com/questions/4685450/why-is-the-result-of-1-3-0) — MWB, Nov 21 '18 at 17:38

score 2 · Answer 1 · answered Nov 21 '18 at 17:37

2

You want (100.0 * count / sentence.length()). You're using the % operator which is the modulo of two numbers

answered Nov 21 '18 at 17:37

flakes

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GBlodgett · Answer 2 · 2018-11-21T17:43:15.820

1

When you calculate the percent you do:

sentence.length() % count

But % is the modulo operator, which calculates remainder. You wanted to divide:

sentence.length() / count

However this will still not get you the right results as the scale is not right, and you are dividing incorrectly. It should be:

100 *count / sentence.length()

Or

100.0 *count / sentence.length()

If you want to avoid truncation

Output:

You entered the sentence Hello World
The number of words in the sentence is 11
The numner of vowels in your sentence is 3
The percentage of vowels is 27%

edited Nov 21 '18 at 17:43

answered Nov 21 '18 at 17:36

GBlodgett

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When dealing with percentage its usually better to use a floating point `100.0` rather than an integer to avoid truncation. – flakes Nov 21 '18 at 17:41
@flakes Not necessarily. Rounding to the next integer below is probably exactly what OP wants. – Dawood ibn Kareem Nov 21 '18 at 17:42
i also believe i need to add a float, but do not know where i would add this, the code you wrote has helped me so thank you – ahmed2993 Nov 21 '18 at 17:48
@Satoshi1999 What do you mean by add a float? – GBlodgett Nov 21 '18 at 17:49
1

Nevermind, just made the correct changes and everything is correct, thank you – ahmed2993 Nov 21 '18 at 17:51

score 0 · Answer 3 · answered Nov 21 '18 at 17:37

0

You are not using correct operator. modulus(%) gives you the remainder after the division. You need to use division (/) operation. You may want to use double/float for getting accurate value.

answered Nov 21 '18 at 17:37

Sachin Gupta

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How to find out the percentage of vowels in a string?

3 Answers3