【C】strtoll 函数用例

int main() {
    unsigned long s = CHAR_BIT * sizeof(1l); // bit size; must be power of 2
    unsigned long mask = ~0UL;
    printf("s = %lu  n", s);
    pb(s);
    printf("s = %lu  n", mask);
    pb(mask);

    unsigned long i = rev(1l);
    printf("s = %lu  n", i);
    pb(i);


    char str[30] = " 2030300 This is test";
    char *ptr;
    long ret;

    ret = strtoll(str, &ptr, 10);
    printf("数字（无符号长整数）是 %ldn", ret);
    printf("n字符串部分是 |%s|", ptr);

    if (isspace(((char*)str)[0])){
        if (ptr[0] != ''){
            printf("nptr[0] != '' |%s|", ptr);
        }
        printf("n isspace |%s|", ptr);
    }

}

|| 结果：
数字（无符号长整数）是 2030300

字符串部分是 | This is test|
ptr[0] != '' | This is test|
 isspace | This is test|
Process finished with exit code 0