Example: C program to check whether a character is vowel or consonant using if else

// C program to check whether a character is vowel or consonant using if else
#include <stdio.h>
#include <ctype.h>
// this header file loaded for check the charcters

int main() {
    char random_character;
    int lowercase = 0, uppercase = 0;
    
    printf("Enter a character to check: ");
    scanf("%c", &random_character);

    // isalpha() function will check
    // whether character is alphabetic or non-alphabetic
    if (random_character && isalpha(random_character)) {

        // it will be return 1
        // if input character matched with these small characters
        lowercase = random_character == 'a' || random_character == 'e' || random_character == 'i' || random_character == 'o' || random_character == 'u';
        
        // it will be return 1
        // if input character matched with these capital characters
        uppercase = random_character == 'A' || random_character == 'E' || random_character == 'I' || random_character == 'O' || random_character == 'U';
       
        if (lowercase || uppercase)
            printf("\n'%c' is a vowel character.\n", random_character);
        else
            printf("\n'%c' is a consonant character.\n", random_character);
    } else {
        printf("\nSorry, You entered Non-Alphabetic character!\n");
    }
    
    return 0;
}