Question

编写一个名为＆＃34; isOldEnoughToDrinkAndDrive＆＃34;的函数。

给出一个数字，在这种情况下是一个年龄，＆＃34; isOldEnoughToDrinkAndDrive＆＃34;返回这个特定年龄的人是否足够大，可以在美国合法饮酒和开车。

注意： *美国的法定饮酒年龄为21岁。 *在美国喝酒和开车总是违法的。

var output = isOldEnoughToDrinkAndDrive(22);
console.log(output); // --> false

入门代码：

function isOldEnoughToDrinkAndDrive(age) {
  // your code here
}

我的解决方案：

function isOldEnoughToDrinkAndDrive(age) {
  // your code here
  var output = age >= 21;
  console.log(output); 
  return output;
}

var output = isOldEnoughToDrinkAndDrive(21);

我在提交结果时遇到的错误如下。

This is the error I am getting

有人可以帮忙吗？

Answer 1

您的代码应该返回false，因为总是非法在美国喝酒和开车。

return false;

Answer 2

你的代码应该总是返回false，那么为什么不返回FALSE（因为它在美国总是非法饮酒和开车）？

无论如何，你的代码返回TRUE，因为21岁大于或等于（在这种情况下）21岁的饮酒年龄。但是结果与传递的参数没有任何关系。

Answer 3

在纯JS中，您的代码运行良好。来自控制台的结果：

但我认为您从表单中获取数据类型。你应该在比较之前将它转换为Int：

function isOldEnoughToDrinkAndDrive(age) {
  return false;
}

但此问题的正确答案是这样的代码：

#include <iostream>
#include <string>

struct port_t {
  int id;
  std::string name;
};

struct node_t {
  struct port_t port;
  struct node_t *next;
};

void create_node(node_t **list, int id, std::string name) {
  node_t *node = *list;

  if(node == NULL) {
    node = new (node_t);
    node->port.id = id;
    node->port.name.assign(name);
    node->next = NULL;
    *list = node;
    return;
  }

  while (node != NULL) {
    if (node->next == NULL) {
      node->next = new (node_t);
      node = node->next;
      node->port.id = id;
      node->port.name.assign(name);
      node->next = NULL;
      break;
    } else {
      node = node->next;
    }
  }
}

int print_list(node_t *list) {
  node_t *tmp = list;

  if(tmp == NULL) {
    std::cout << "List is empty!" << std::endl;
    return -1;
  }

  std::cout << "Print linked list:" << std::endl;
  while(tmp != NULL) {
    std::cout << "Port Id:" << tmp->port.id << " Name:" << tmp->port.name << std::endl;
    tmp = tmp->next;
  }

  return 0;
}

void erase_list(node_t **list) {
    node_t *node = *list;
    node_t *tmp = NULL;

    while (node != NULL) {
      if (node->next == NULL) {
        delete node;
        node = NULL;
        *list = node;
      } else {
        tmp = node->next;
        delete node;
        node = tmp;
      }
    }
}

void remove_node(node_t **list, node_t *r_node) {
  if (list == NULL) {
    std::cout << "Cannot remove node from an empty list" << std::endl;
    return;
  }

  if(r_node->port.id == (*list)->port.id) {
    node_t *temp = *list;
    std::cout << "After Removal of element ID:" << temp->port.id << std::endl;
    *list = (*list)->next;
    delete temp;
    temp = NULL;
    return;
  }

  node_t *current = (*list)->next;
  node_t *previous = *list;

  while (current != NULL) {
    if(current->port.id == r_node->port.id) {
        std::cout << "After Removal of element ID:" << current->port.id << std::endl;
        previous->next = current->next;
        delete current;
        current = NULL;
        return;
    }
    previous = current;
    current = current->next;
  }
}

int main() {
  struct node_t *list = NULL;
  node_t tmp;
  create_node(&list, 1, "node1");
  create_node(&list, 2, "node2");
  create_node(&list, 3, "node3");
  create_node(&list, 4, "node4");
  create_node(&list, 5, "node5");
  print_list(list);
  erase_list(&list);
  print_list(list);

  tmp.port.id = 4;
  tmp.port.name.assign("node4");
  create_node(&list, 1, "node1");
  create_node(&list, 2, "node2");
  create_node(&list, 3, "node3");
  create_node(&list, 4, "node4");
  create_node(&list, 5, "node5");
  remove_node(&list, &tmp);
  print_list(list);

  tmp.port.id = 2;
  tmp.port.name.assign("node2");
  remove_node(&list, &tmp);
  tmp.port.name.clear();
  print_list(list);
  erase_list(&list);
  print_list(list);

  if(list) {
    delete list;
  }
  list = NULL;

  return 0;
}

因为：在美国喝酒和开车总是违法的。

获取控制台错误以返回false

3 个答案: