C++ Basic 函数程序不会编译时出现大量错误

Question

当我尝试用 g++ 编译它时，这个程序给我一个完整的错误屏幕，但我什至没有开始困难的部分。只是打印说明。这里有什么问题？

/* Samuel LaManna
CSC 135 Lisa Frye
Program 2 Functions (Shipping Charges)
Calculate the shipping and total charge
for shipping spools of wire
*/

#include <iostream>

using namespace std;

void instruct();     //Function Declaration for instruction function

int main()
{
  instruct();     // Function to print instructions to user

  return 0;
}


/********************************************/
// Name: Instruct                            /
// Description: Print instructions to user   /
// Parameters: N/A                           /
// Reture Value: N/A                         /
/********************************************/

void instruct()
{
  cout << "This program will calculate the shipping information "
       << "for a batch of wire spools. " << endl < endl;

  return;
}

Answer 1

这是一个问题:

<< endl < endl;

应该是:

<< endl << endl;