C Program to Check Vowel or Consonant

Flow Control
If-else Statement in C
Programs on if-else
Switch Case in C
Switch case Programs
Conditional Operator
While loop in C
Do-while loop in C
While vs do-while
For loop in C
Break keyword in C
Continue keyword in C
Break vs Exit in C
Goto keyword in C
☕️ Flow Control Programs
Largest in 3 Numbers
Find Grade of student
Find the absolute value
Vowel or Consonant
Leap Year Program
Simple calculator in C
Check Odd or Even 
Roots of Quadratic Equation
Find Reverse of Number
Factors of a number in C
Generate Multiplication table
Find Power of a Number
Find GCD and LCM
Find factorial of Number
Count Number of Digits
Sum of digits in Number
Sum of N Natural Numbers
Sum of Squares of Natural No.
Find Sum of Odd Numbers
Find the Sum of Series
Find Fibonacci series in C
Sum of the Fibonacci series
Sum until enters +ve numbers
Sum of max 10 no. & Skip -ve
☕️ C Conversion Programs
Celsius to Fahrenheit
Fahrenheit to Celsius
Decimal ↔ Binary
Decimal ↔ Octal
Octal ↔ Binary in C
☕️ Number Programs in C
Prime Number in C
Strong Number in C
Krishnamurthy Number
Neon Number in C
Palindrome number
Perfect Number in C
Armstrong Number
☕️ Pattern Programs in C
Pattern programs in C
Printing pattern using loops
Floyd’s triangle Program
Pascal Triangle Program
Pyramid Star Pattern in C
Diamond Pattern Programs
Half Diamond pattern in C
Print Diamond Pattern
Hollow Diamond Pattern
Diamond Pattern of Numbers

In the English language, the letters A, E, I, O, U and a, e, i, o, u defined as a vowel. Except these all other letters are consonants. We can write a c program to check vowel or consonant using an if-else statement or by using switch-case statements.

Prerequisites for checking vowel or consonant:- If-else statement in C, Programs on if-else in C, Switch case in C programming, Programs on switch case in C

C program to check vowel or consonant Using If-else

#include<stdio.h>
int main()
{
   char ch;
   char uppercase, lowercase;

   printf("Enter any character: ");
   scanf("%c", &ch);

   uppercase = (ch=='A'||ch=='E'||ch=='I'||ch=='O'||ch=='U');
   lowercase = (ch=='a'||ch=='e'||ch=='i'||ch=='o'||ch=='u');

   if( uppercase || lowercase )
     printf("%c is Vowel.",ch);
   else
     printf("%c is consonant.",ch);

   return 0;
}

Output:-

Enter any character: a
a is Vowel.

Enter any character: K
K is consonant.

In this program, we take two variables “uppercase” and “lowercase”. If the character is in uppercase and vowel then uppercase stores 1 else it store 0. Similarly, the variable lowercase store 1 if the character is in lowercase and vowel else it will store 0.

Now, inside if condition when at least one variable (among the variables uppercase and lowercase) value is 1 then condition will be true and the character is a vowel, else the character is consonant.

In the above program if the character is not alphabet i.e. special character or digits then it will display consonant. It is not the correct answer. When the character is not an alphabet then it should display different results. The given below program shows it.

Check Character is Vowel or Consonant using Switch case

#include<stdio.h>
int main()
{
   char ch;
   char uppercase, lowercase;
   int result;

   printf("Enter any character: ");
   scanf("%c",&ch);

   uppercase = (ch=='A'||ch=='E'||ch=='I'||ch=='O'||ch=='U');
   lowercase = (ch=='a'||ch=='e'||ch=='i'||ch=='o'||ch=='u');
   result = ( uppercase||lowercase );

   switch(result)
   {
   case 1:
     printf("Vowel\n");
     break;
   case 0:
     printf("Consonant\n");
     break;
   default:
     printf("Invalid character\n");
     break;
   }

   return 0;
}

Output:-

Enter any character: e
Vowel

Enter any character: p
Consonant

In this program when the character is not an alphabet then the default statement is executed and displayed “Invalid character” to the screen.

With the help of pre-defined function

In the above two programs, we were taking uppercase and lowercase letter differently. By this way, we need to write some extra code. For this solution, we can use either tolower() or toupper() function which is defined in “ctype.h

tolwer(c):- It returns lowercase version if the c is a capital letter otherwise it returns c.

toupper(c):- It returns uppercase version if the c is a lowercase letter otherwise, it returns c.

When we use the tolower() function, we need to check only for lowercase letters, not for uppercase letters. Now, we can use either an if-else or switch-case statement.

#include<stdio.h>
#include<ctype.h>
int main()
{
   char ch;
   int result;

   printf("Enter any character: ");
   scanf("%c",&ch);

   ch = tolower(ch);
   result = (ch=='a'||ch=='e'||ch=='i'||ch=='o'||ch=='u');

   switch(result)
   {
   case 1:
     printf("Vowel\n");
     break;
   case 0:
     printf("Consonant\n");
     break;
   default:
     printf("Invalid character\n");
     break;
   }

   return 0;
}

Output:-

Enter any character: S
Consonant

Enter any character: I
Vowel

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Flow Control
If-else Statement in C
Programs on if-else
Switch Case in C
Switch case Programs
Conditional Operator
While loop in C
Do-while loop in C
While vs do-while
For loop in C
Break keyword in C
Continue keyword in C
Break vs Exit in C
Goto keyword in C
☕️ Flow Control Programs
Largest among 3 Numbers
Find Grade of student
Find the absolute value
Check Vowel or Consonant
Leap Year Program
Simple calculator in C
Check Odd or Even 
Roots of Quadratic Equation
Find Reverse of Number
Factors of a number in C
Generate Multiplication table
Find Power of a Number
Find GCD and LCM
Find factorial of Number
Count Number of Digits
Sum of digits in Number
Sum of N Natural Numbers
Sum of Squares of Natural No.
Find Sum of Odd Numbers
Find the Sum of Series
Find Fibonacci series in C
Sum of the Fibonacci series
Sum until enters +ve numbers
Sum of max 10 no. & Skip -ve
☕️ C Conversion Programs
Celsius to Fahrenheit
Fahrenheit to Celsius
Decimal ↔ Binary
Decimal ↔ Octal
Octal ↔ Binary in C
☕️ Number Programs in C
Prime Number in C
Strong Number in C
Krishnamurthy Number
Neon Number in C
Palindrome number
Perfect Number in C
Armstrong Number
☕️ Pattern Programs in C
Pattern programs in C
Printing pattern using loops
Floyd’s triangle Program
Pascal Triangle Program
Pyramid Star Pattern in C
Diamond Pattern Programs
Half Diamond pattern in C
Print Diamond Pattern
Hollow Diamond Pattern
Diamond Pattern of Numbers

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