What is the output

    #include stdio.h 
    #include ctype.h
    int main ()
    {
        int i = 0;
        char str[] = "clowns\n";
        char c;
        while (str[i])
        {
            c = str[i];
            if (islower(c)) 
                c = toupper(c);
            putchar (c);
            i++;
        }
        return 0;
    }