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C program to check whether a character is vowel or consonant

C program to check whether a character is a vowel or consonant: A user will input a character and we will check whether it is a vowel or not. Both lower-case and upper-case are checked.

Check vowel using if else

#include <stdio.h>

int main()
{
  char ch;
 
  printf("Enter a character\n");
  scanf("%c", &ch);

  // Checking both lower and upper case, || is the OR operator

  if (ch == 'a' || ch == 'A' || ch == 'e' || ch == 'E' || ch == 'i' || ch == 'I' || ch =='o' || ch=='O' || ch == 'u' || ch == 'U')
    printf("%c is a vowel.\n", ch);
  else
    printf("%c isn't a vowel.\n", ch);
     
  return 0;
}

Output of program:
C program to check vowel output

Check vowel using switch statement

#include <stdio.h>
 
int main()
{
  char ch;
 
  printf("Input a character\n");
  scanf("%c", &ch);
 
  switch(ch)
  {
    case 'a':
    case 'A':
    case 'e':
    case 'E':
    case 'i':
    case 'I':
    case 'o':
    case 'O':
    case 'u':
    case 'U':
      printf("%c is a vowel.\n", ch);
      break;
    default:
      printf("%c isn't a vowel.\n", ch);
  }              
 
  return 0;
}

C program to check vowel or consonant using if else

In this program we will check whether a character is a vowel or consonant or a special character

#include <stdio.h>

int main()
{
  char ch;

  printf("Input a character\n");
  scanf("%c", &ch);

  if ((ch >= 'a' && ch <= 'z') || (ch >= 'A' &&ch <= 'Z')) {
    if (ch=='a' || ch=='A' || ch=='e' || ch=='E' || ch=='i' || ch=='I' || ch=='o' || ch=='O' || ch== 'u' || ch=='U')
      printf("%c is a vowel.\n", ch);
    else
      printf("%c is a consonant.\n", ch);
  }
  else
    printf("%c is neither a vowel nor a consonant.\n", ch);

  return 0;
}

Function to check vowel

int check_vowel(char a)
{
  if (a == 'A' || a == 'E' || a == 'I' || a == 'O' || a == 'U')
    return 1;
  else if (a == 'a' || a == 'e' || a == 'i' || a == 'o' || a == 'u')
    return 1;
  else    // You may omit this else as the control will come here if the character is not a vowel.
    return 0;
}

This function can also be used to check if a character is a consonant or not if it's not a vowel, then it will be a consonant, but make sure that the character is an alphabet, not a special character.

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