Question

我是C ++的新手，有人可以向我解释为什么我在使用“std :: getline”时收到以下错误？这是代码：

#include <iostream>
#include <string>

int main() {

  string name;  //receive an error here

  std::cout << "Enter your entire name (first and last)." << endl;
  std::getline(std::cin, name);

  std::cout << "Your full name is " << name << endl;

  return 0;
}


ERRORS:
te.cc: In function `int main()':
te.cc:7: error: `string' was not declared in this scope
te.cc:7: error: expected `;' before "name"
te.cc:11: error: `endl' was not declared in this scope
te.cc:12: error: `name' was not declared in this scope

然而，当我使用“getline”和“using namespace std”时，程序将运行并编译。而不是std :: getline。

#include <iostream>
#include <string>

using namespace std;

int main() {

  string name;

  cout << "Enter your entire name (first and last)." << endl;
  getline(cin, name);

  cout << "Your full name is " << name << endl;
  return 0;
}

谢谢！

Answer 1

错误不是来自std::getline。除非您使用std::string，否则您需要使用using namespace std。还需要std::endl。

Answer 2

您需要对该命名空间中的所有标识符使用std::。在这种情况下，std::string和std::endl。你可以在getline()没有它的情况下离开，因为Koenig查找会为你解决这个问题。

Answer 3

#include <iostream>
#include <string>

int main() 
{
    std::string name;  // note the std::

    std::cout << "Enter your entire name (first and last)." << std::endl; // same here
    std::getline(std::cin, name);

    std::cout << "Your full name is " << name << std::endl; // and again

    return 0;
}

您只需要为std命名空间中的各种元素声明命名空间（或者，您可以删除所有std::并在包含后添加using namespace std;行。）

Answer 4

尝试一下：

 #include <iostream>
#include <string>

int main() 
{
     std::string name; 

      std::cout << "Enter your entire name (first and last)." << 
      std::endl;

      while(getline(std::cin, name))
      {
            std::cout <<"Your name is:"<< name << '\n';
     }

  return 0;
}

C ++ std :: getline错误

4 个答案: