Check whether a character is an uppercase or lowercase alphabet with C language

#include <stdio.h>

int main()
{
    char ch;

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

    if (ch >= 'A' && ch <= 'Z')
    {
        printf("'%c' is uppercase alphabet.", ch);
    }
    else if (ch >= 'a' && ch <= 'z')
    {
        printf("'%c' is lowercase alphabet.", ch);
    }
    else
    {
        printf("'%c' is not an alphabet.", ch);
    }

    return 0;
}

Output:-


Enter any character : K
'K' is uppercase alphabet.