Program to Count Vowels and Consonants in a string

One of the popular programs which can be asked by the interviewer during the interview is to count no. of Vowels and Consonants in a string. The letters A, E, I, O, and U are called Vowels and the other letters (except vowels) in the alphabet are known as Consonants.

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In the below example, User will input the string which will be converted to lowercase so that comparison can be done without worrying about Upper-case or Lower-case characters. Then looping through each character of the string and check whether the character is in ‘a’, ’e’, ’I’, ’o’, and ‘u’. If yes, then increase the vowel counter value by 1. If the entered alphabet is between a to z but not in Vowels then need to increase Consonants variable value by 1. 

Program in C#:

Console.WriteLine("Count no. of Vowels and Consonants in a string"); //Variables to hold the Vowels and Consonants count int vCount = 0; int cCount = 0; string inputString = string.Empty; //Recieve the input from the user inputString = Console.ReadLine(); //Lower the characters of the string for the comparision inputString = inputString.ToLower(); //Loop through the each character of the string for (int i = 0; i < inputString.Length; i++) {     //check and increase the counter if character is vowel     if (inputString[i]=='a' || inputString[i]=='e' || inputString[i] == 'i' || inputString[i] == 'o' || inputString[i] == 'u')     {         vCount++;     }     //check and increase the counter if character is consonant     else if (inputString[i]>='a' && inputString[i] <= 'z')     {         cCount++;     } } //Showing the Vowels and Constants count in a string to the user Console.WriteLine("Total no. of Vowels in a string=" + vCount); Console.WriteLine("Total no. of Constants in a string=" + cCount); Console.ReadLine();

Preview:

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