Error end1 was not declared in this scope

I just started using Eclipse to program C++ and I’m running into issues. I have MinGW installed. Right now I have a simple addition program as followed:

#include <iostream>

using namespace std;

int main() {
    int number1;
    int number2;
    int sum;

    cout << "Enter first integer: ";
    cin >> number1;
    cout << "Enter second integer: ";
    cin >> number2;

    sum = number1 + number2;

    cout << sum << end1;

}

and I have an error Symbol end1 could not be resolved and end1 was not declared in this scope

I had this error before with using namespace std; and I had to go through some configurations to get the MinGW compiler to work with Eclipse. I don’t understand why this error is still coming up. On a somewhat side note I tried removing end1 and running the program and the console just said, «Info: Nothing to build for CTest» (which is the name of my Project folder name). Any help would be much appreciated.

EDIT: The «can not be resolved issue has been fixed by changing end1 to endl but the console is still saying «nothing to build»

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#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <sys/socket.h>
#include <sys/unistd.h>
#include <sys/types.h>
#include <sys/errno.h>
#include <netinet/in.h>
#include <signal.h>
#include <iostream>
#include <thread>

using namespace std;

#define BUFFSIZE 2048
#define DEFAULT_PORT 4001    //
#define MAXLINK 2048

void connecter()
{
    printf("Listening...n");
    while (true)
    {
        signal(SIGINT, stopServerRunning);    // 
        // 
        connfd = accept(sockfd, NULL, NULL);
        if (-1 == connfd)
        {
            printf("Accept error(%d): %sn", errno, strerror(errno));
            return -1;
        }
    }
}

void listener()
{
    while(true)
    {
        bzero(buff, BUFFSIZE);
        //
        recv(connfd, buff, BUFFSIZE - 1, 0);
        // 
        printf("клиент: %sn", buff);
        //
        send(connfd, buff, strlen(buff), 0);
    }
}

void sender()
{
    while(true)
    {
        printf("Please input: ");
        scanf("%s", buff);
        send(connfd, buff, strlen(buff), 0);
        bzero(buff, sizeof(buff));
        recv(connfd, buff, BUFFSIZE - 1, 0);
        printf("recv: %sn", buff);
    }
}

int sockfd, connfd; 
void stopServerRunning(int p)
{
    close(sockfd);
    printf("Close Servern");
    exit(0);
}
int main()
{
    struct sockaddr_in servaddr;
    char buff[BUFFSIZE];
    //
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (-1 == sockfd)
    {
        printf("Create socket error(%d): %sn", errno, strerror(errno));
        return -1;
    }
    // 
    // 
    bzero(&servaddr, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
    servaddr.sin_port = htons(DEFAULT_PORT);
    if (-1 == bind(sockfd, (struct sockaddr*)&servaddr, sizeof(servaddr)))
    {
        printf("Bind error(%d): %sn", errno, strerror(errno));
        return -1;
    }
    // 
    //
    if (-1 == listen(sockfd, MAXLINK))
    {
        printf("Listen error(%d): %sn", errno, strerror(errno));
        return -1;
    }
    
    while(true)
    {
        thread my_thread(connecter);
        if(connfd == true)
            break;
    }

    thread my_thread(connecter);
    thread my_thread(listener);
    thread my_thread(sender);

    return 0;
}

}

это исходный код программы, хотел написать что-то вроде чата на сокетах. Я попытался скомпилировать код, но он мне выдал несколько ошибок «was not declared in this scope». Вот вывод компилятора:

server.cpp: In function ‘void connecter()’:
server.cpp:24:24: error: ‘stopServerRunning’ was not declared in this scope
   24 |         signal(SIGINT, stopServerRunning);    // Это предложение используется для выключения сервера при вводе Ctrl + C
      | 

server.cpp:26:9: error: ‘connfd’ was not declared in this scope
   26 |         connfd = accept(sockfd, NULL, NULL);
      |         ^~~~~~

server.cpp:26:25: error: ‘sockfd’ was not declared in this scope; did you mean ‘socket’?
   26 |         connfd = accept(sockfd, NULL, NULL);
      |                         ^~~~~~
      |                         socket

server.cpp: In function ‘void listener()’:
server.cpp:39:15: error: ‘buff’ was not declared in this scope
   39 |         bzero(buff, BUFFSIZE);
      |               ^~~~

server.cpp:41:14: error: ‘connfd’ was not declared in this scope
   41 |         recv(connfd, buff, BUFFSIZE - 1, 0);
      |              ^~~~~~

server.cpp: In function ‘void sender()’:
server.cpp:54:21: error: ‘buff’ was not declared in this scope
   54 |         scanf("%s", buff);
      |                     ^~~~

server.cpp:55:14: error: ‘connfd’ was not declared in this scope
   55 |         send(connfd, buff, strlen(buff), 0);
      |              ^~~~~~

я думаю, что все эти ошибки идут из одной проблемы, но не могу понять откуда

Common G++ Errors

Summary

This is a guide to help you CS35ers make sense of g++ and its often cryptic error messages.

If you discover an error not listed here feel free to edit this wiki,
or send your error along with source code and an explanation to me — grawson1@swarthmore.edu

Weird Errors

If you are getting strange compiler errors when your syntax looks fine, it might be a good idea to check that your Makefile is up to date
and that you are including the proper .h files. Sometimes a missing } or ; or ) will yield some scary errors as well.
Lastly, save all files that you might have changed before compiling.

Bad Code Sample

#include<iostream>
using namespace std;
 
int main(){
 
  int foo;
 
  for(int i = 0, i<100, i++) {
    foo++;
    cout << foo << endl;
  }
  return 0;
}

for(int i = 0; i<100; i++) {
    foo++;
    cout << foo << endl;
  }

 int foo = 0;

‘cout’ was not declared in this scope

 #include<iostream> 

 using namespace std; 

‘printf’ was not declared in this scope

 #include<cstdio> 

Cannot Pass Objects of non-POD Type

int main(){
 
  string foo = "dog";
  printf("This animal is a %s.n",foo);
  return 0;
}

printf("This animal is a %s.n",foo.c_str());

Invalid Use of Member

int main(){
 
  string foo = "dog";
  printf("This animal is a %s.n",foo.c_str);
 
  return 0;
}

printf("This animal is a %s.n",foo.c_str());

Request for Member ‘Foo’ in ‘Bar’, which is of non-class type ‘X’

void useCard(CreditCard *card, int method) {
  //Used to access the methods of the class
 
  if (method==1) {
    card.print();
  }

  if (method==1) {
    card->print();
  }

Undefined Reference to V Table

myClass::~myClass(){}