In this program, you'll learn to count the number of vowels, consonants, digits and spaces in a given sentence using if else in Java.
Program:
import java.util.*;
public class Count
{
public static void main(String[] args) {
String line;
int vowels = 0, consonants = 0, digits = 0, spaces = 0;
Scanner sc=new Scanner(System.in);
System.out.println("Input a line: ");
line=sc.nextLine();
line = line.toLowerCase();
for(int i = 0; i < line.length(); ++i)
{
char ch = line.charAt(i);
if(ch == 'a' || ch == 'e' || ch == 'i'
|| ch == 'o' || ch == 'u') {
++vowels;
}
else if((ch >= 'a'&& ch <= 'z')) {
++consonants;
}
else if( ch >= '0' && ch <= '9')
{
++digits;
}
else if (ch ==' ')
{
++spaces;
}
}
System.out.println("Vowels: " + vowels);
System.out.println("Consonants: " + consonants);
System.out.println("Digits: " + digits);
System.out.println("White spaces: " + spaces);
}
}
Output:
Input a line:
welcome to java 2020
Vowels: 6
Consonants: 7
Digits: 4
White spaces: 3
In the above example, we've 4 conditions for each of the checks.
- The first if condition is to check whether the character is a vowel or not.
- The else if condition following if is to check whether the character is a consonant or not. The order should be the same otherwise, all vowels are treated as consonants as well.
- The 3rd condition (else-if) is to check whether the character is between 0 to 9 or not.
- Finally, the last condition is to check whether the character is a space character or not.
- For this, we've lowercased the line using toLowerCase(). This is an optimization done not to check for capitalized A to Z and vowels.
- We've used length() function to know the length of the string and charAt() to get the character at the given index (position).
