DEVC++ 编译时出现[Error] ld returned 1 exit status可能错误

DEVC++编译时经常出现[Error] ld returned 1 exit status类似错误，除了可能的主函数名写错、已经运行了一个命令窗口外
还有可能是，函数声明了，但是忘记了定义。本人是h文件中声明了BankAccount()，但是在cpp源文件中忘记了定义BankAccount()的内容，错误找了很长时间。

#ifndef BANKACCOUNT_H
#define BANKACCOUNT_H#include <iostream>
#include <string>class BankAccount
{private:std::string name;std::string account;int number;public:BankAccount();BankAccount(std::string nam, std::string acco,int num);~BankAccount();void showbankaccount(const BankAccount &B);void depoist(BankAccount &B, int num);void withdraw(BankAccount &B, int num);
};#endif

#include <iostream> 
#include "BankAccount.h"
//using namespace std;
BankAccount::BankAccount() ;
{name="no name";account="no account";number=0; 
}BankAccount::BankAccount(std::string nam, std::string acco, int num)
{name=nam;account=acco;number=num;
}
void BankAccount::showbankaccount(const BankAccount &B)
{std::cout<<"Here is your account informaiton:\n";std::cout<<"Name: "<<B.name<<std::endl;std::cout<<"Account: "<<B.account<<std::endl;std::cout<<"Balance: "<<B.number<<std::endl; 
}
void BankAccount::depoist(BankAccount &B, int num)
{B.number+=num;
}void BankAccount::withdraw(BankAccount &B, int num)
{if(num>B.number){std::cout<<"You do not have so much money!"<<std::endl;
//		break;}elseB.number-=num;
}
BankAccount::~BankAccount()			//析构函数未定义导致编译失败，本题中，函数声明了就要定义 
{std::cout<<"_________________"<<std::endl;} 

#include <iostream>
#include "BankAccount.h"
#include <string>int main() 
{BankAccount bankact1("Jack", "ABC", 900);BankAccount bankact2;bankact1.showbankaccount(bankact1);bankact1.depoist(bankact1,200);bankact1.showbankaccount(bankact1);bankact1.withdraw(bankact1,1000);bankact1.showbankaccount(bankact1);bankact2.showbankaccount(bankact2);return 0;}