C++ Program to Check Vowel or Consonant

In this post, we will write a C++ program to check vowel or consonant. First, we will write a program using the if-else statement and then we will write a C++ program to check vowel or consonant using the switch case statement.

C++ Program to check whether the character is vowel or consonant using if-else

#include<iostream>
using namespace std;
int main()
{
  // declare variables
  char ch;
  int uppercase, lowercase;

  // take input
  cout << "Enter a Character: ";
  cin >> ch;

  // evaluates to 1(true) if ch is a uppercase Vowel
  uppercase = (ch=='A' || ch=='E' || ch=='I' || ch=='O' || ch=='U');

  // evaluates to 1(true) if ch is a lowercase Vowel
  lowercase = (ch=='a' || ch=='e' || ch=='i' || ch=='o' || ch=='u');

  // evaluates to 1(true) if either uppercase or lowercase is true
  if(uppercase || lowercase)
    cout << ch << " is Vowel." << endl;
  else
    cout << ch << " is Consonant." << endl;

  return 0;
}

Output for the different test-cases:-

Enter a Character: V
V is Consonant.

Enter a Character: a
a is Vowel.

In this program, for uppercase and lowercase vowel alphabets, we take two variables and then compared it. But it is not required to take these variables, we can do the same as the below program,

#include<iostream>
using namespace std;
int main()
{

  // declare variable
  char ch;

  // take input
  cout << "Enter a character:";
  cin >> ch;

  // check alphabet
  if( (ch=='A'||ch=='E'||ch=='I'||ch=='O'||ch=='U') || 
       (ch=='a'||ch=='e'||ch=='i'||ch=='o'||ch=='u') )
  cout << ch << " is vowel \n";
  else cout << ch << " is consonant \n";

  return 0;
}

C++ Program to Check Vowel or Consonant using Switch

In the above programs, we have written conditions separately for the uppercase and lowercase characters. And it increases the length of the code. We can solve this using tolower() or toUpper() function.

The idea is to, convert the input into either in uppercase or lowercase and write condition only for them (uppercase or lowercase). If we will convert the input into lowercase then we have to write the condition only for the lowercase character.

The tolower() function takes a character and returns a lowercase character. Similarly, toUpper() function converts the given character into an uppercase character.

#include<iostream>
using namespace std;
int main()
{

  // declare variable
  char ch;

  // take input
  cout << "Enter a character : ";
  cin >> ch;
  
  // convert uppercase to lowercase
  ch = tolower(ch);

  // check alphabet
  switch(ch)
  {
      case 'a' :
        cout << "Vowel";
        break;
      case 'e' :
        cout << "Vowel";
        break;
      case 'i' :
        cout << "Vowel";
        break;
      case 'o' :
        cout << "Vowel";
        break;
      case 'u' :
        cout << "Vowel";
        break;
      default :
        cout << "Consonant";
  }
  return 0;
}

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