C Exercises: Check whether an alphabet is a vowel or consonant

Last update on March 18 2025 13:32:35 (UTC/GMT +8 hours)

17. Vowel or Consonant Check

Write a C program to check whether an alphabet is a vowel or a consonant.

Visual Presentation:

For more Practice: Solve these Related Problems:

• Write a C program to check if an input alphabet is a vowel or consonant, handling both uppercase and lowercase letters.
• Write a C program to determine vowel or consonant status without using a switch-case construct.
• Write a C program to count the number of vowels and consonants in a given string.
• Write a C program to check if a character is a vowel by comparing its ASCII value against vowel codes.

Sample Solution:

C Code:

#include <stdio.h>  // Include the standard input/output header file.

void main()  
{  
    char sing_ch;  // Declare a variable to store a single character.

    printf("Input any alphabet : ");  // Prompt user for input.  
    scanf("%c", &sing_ch);  // Read and store the character input.

    if(sing_ch=='a' || sing_ch=='e' || sing_ch=='i' || sing_ch=='o' || sing_ch=='u' || sing_ch=='A' || sing_ch=='E' || sing_ch=='I' || sing_ch=='O' || sing_ch=='U')  
    {  
        printf("The alphabet is a vowel.\n");  // Print message for vowel.
    }  
    else if((sing_ch>='a' && sing_ch<='z') || (sing_ch>='A' && sing_ch<='Z'))  
    {  
        printf("The alphabet is a consonant.\n");  // Print message for consonant.
    }  
    else  
    {  
        printf("The character is not an alphabet.\n");  // Print message for non-alphabet character.
    }   
}
 

Output:

Input any alphabet : K                                                                                        
The alphabet is a consonant. 

Flowchart:

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