Day2 - Задачи 6, 7 & 8

#include <stdio.h>
#include <stdlib.h>

int isLower(char sym){
    if(sym >= 'a' && sym <= 'z'){
       printf("Yes");
    }else{
       printf("No");
    }
}

int isUpper(char sym){
    if(sym >= 'A' && sym <= 'Z'){
        printf("Yes");
    }else{
        printf("No");
    }
}

int isLetter(char sym){
    return isLower(sym) || isUpper(sym) ? "Yes" : "No";
}

int main(){
    printf("%c\n", isLower('3'));
    printf("%c\n", isUpper('B'));
    printf("%c\n", isLetter('f'));

    return 0;
}