C programming, Check if a letter is alphabetical or not.

#include <stdio.h>

int main() {

    char c;

    printf("Enter a character: ");

    scanf("%c", &c);

    if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))

        printf("%c is an alphabet.", c);

    else

        printf("%c is not an alphabet.", c);

    return 0;

}