[错误]期望在'{'标记之前的unqualified-id [英] [Error] expected unqualified-id before '{' token

问题描述

#include <iostream>
#include <fstream>
#include <conio.h>
#include <string>
using namespace std;

int main();

string username,password,un,pw;
//string username,password
{
    int choice;   
    cout<<"1: Registration\n2: Login\nYour choice: " ;
	cin>>choice;
	
    if (choice ==1)
    {
    	cout<<"Select a username: " ;cin>>username;
     	cout<<"Select a pssword: " ;cin>>password;	
	}	
	else if (choice == 2)
	{		
	 if (username == un && password == pw)
	{
		return true;
	}
    else
    {
    	return false;
	}
				
	}
}

我尝试过：



尝试判断错误究竟是什么错误但不能得到它。

请帮助

What I have tried:

Try To fine what exactly the error but not get it.
pls help

推荐答案

#include <iostream>
#include <fstream>
#include <conio.h>
#include <string>
using namespace std;

int main();  // 1) no ';' here
// 3) here
string username,password,un,pw;
//string username,password
{  // 2) the '{' goes at 3)
	int choice;
	cout<<"1: Registration\n2: Login\nYour choice: " ;
	cin>>choice;

	if (choice ==1)
	{
		cout<<"Select a username: " ;cin>>username;
		cout<<"Select a pssword: " ;cin>>password;
	}
	else if (choice == 2)
	{
		if (username == un && password == pw)
		{
			return true;
		}
		else
		{
			return false;
		}

	}
}

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