我正在开发我的第一个c ++项目。我被提供了一个.h文件，不得不写一个.cpp文件，但它不会编译。我一直收到错误消息：
g ++ -o proj1 proj1.cpp proj1.h
/tmp/ccsK4pOL.o：在函数menuMain()':
proj1.cpp:(.text+0x807): undefined reference to displayBalance（float）＆＃39;
proj1.cpp :(。text + 0x81b）：未定义引用deposit(float&)'
proj1.cpp:(.text+0x82f): undefined reference to撤销（浮动＆amp;）＆＃39;
collect2：ld返回1退出状态
这是我无法更改的.h文件：
#ifndef PROJ1_H
#define PROJ1_H
#include <iostream>
#include <fstream>
#include <string>
#include <iomanip>
using namespace std;
/*
Name: menuStart()
PreCondition: None
PostCondition: Returns the selected option (1, 2, or 3)
*/
int menuStart();
/*
Name: menuMain()
PreCondition: The user input has either been loaded from file or entered by user
PostCondition: Returns the selected option (1, 2, 3, 4, or 5)
*/
int menuMain();
/*
Name: displayAccountDetails
PreCondition: Relevant data (fName, lName, age, accountBalance) has been loaded/entered
PostCondition: None (void)
*/
void displayAccountDetails(string fName, string lName, int age, float accountBalance);
/*
Name: displayBalance
PreCondition: Relevant data (accountBalance) has been loaded/entered
PostCondition: None (void)
*/
void displayBalance(float accountBalance);
/*
Name: deposit
PreCondition: Variable accountBalance is passed-by-reference
PostCondition: accountBalance is permanently changed via pass-by-reference
*/
void deposit(float &accountBalance);
/*
Name: withdraw
PreCondition: Variable accountBalance is passed-by-reference
PostCondition: accountBalance is permanently changed via pass-by-reference
*/
void withdraw(float &accountBalance);
#endif
这是我的代码 - 任何帮助调试都会受到赞赏，因为我对此很陌生。
#include <iostream>
#include <fstream>
#include <string>
#include <iomanip>
#include "proj1.h"
using namespace std;
int main()
{
menuStart();
return 0;
}
// function definitions
int menuStart() //has user load txt file, enter info or exit
{
string firstName;
string lastName;
int userAge;
float balance;
int userIn;
cout << "Welcome to the UMBC ATM" << endl;
cout << "Choose from below: " << endl;
cout << "1. Load a User Profile from File" << endl;
cout << "2. Enter a new User Profile" << endl;
cout << "3. Exit" << endl;
cout << "Enter your choice: " << endl;
cin >> userIn;
//make sure inupt is valid
while (userIn < 1 || userIn > 3)
{
cout << "INVALID. Please choose 1, 2, or 3." << endl;
cout << "Choose from below: " << endl;
cout << "1. Load a User Profile from File" << endl;
cout << "2. Enter a new User Profile" << endl;
cout << "3. Exit" << endl;
cout << "Enter your choice: " << endl;
cin >> userIn;
return 0;
}
if (userIn == 1)
{
//read text file proj1.txt
ifstream profileTxt;
profileTxt.open("proj1.txt");
profileTxt >> firstName >> lastName >> userAge >> balance;
cout << "Name: " << firstName << lastName << endl;
cout << "Age: " << userAge << endl;
cout << "Balance: " << balance << endl;
profileTxt.close();
return 0;
}
if (userIn == 2)
{
//gather info
cout << "Please enter the following: " << endl;
cout << "First Name: " << endl;
cin >> firstName;
cout << "Last Name: " << endl;
cin >> lastName;
cout << "Age: " << endl;
cin >> userAge;
cout << "Initial Deposit: " << endl;
cin >> balance;
cout << balance << "deposited." << endl;
//write to text file to read later
ofstream profileTxt;
profileTxt.open("proj1.txt");
profileTxt << firstName << lastName << userAge << balance << endl;
profileTxt.close();
menuMain();
return 0;
}
else
{
//exit the program
return 0;
}
}
int menuMain() //main menu, user chooses 1-5
{
int userIn;
string firstName;
string lastName;
int userAge;
float balance;
//open user's profile info*
ifstream profileTxt;
profileTxt.open("proj1.txt");
profileTxt >> firstName >> lastName >> userAge >> balance;
cout << "********Please choose option from the menu******** " << endl;
cout << "1. Account Balance" << endl;
cout << "2. Deposit money" << endl;
cout << "3. Withdraw money" << endl;
cout << "4. Dislay your account details" << endl;
cout << "5. Exit" << endl;
cout << "Enter your choice: " << endl;
cin >> userIn;
//make sure inupt is valid
while (userIn < 1 || userIn > 5)
{
cout << "INVALID. Please choose 1 - 5." << endl;
cout << "********Please choose option from the menu******** " << endl;
cout << "1. Account Balance" << endl;
cout << "2. Deposit money" << endl;
cout << "3. Withdraw money" << endl;
cout << "4. Dislay your account details" << endl;
cout << "5. Exit" << endl;
cout << "Enter your choice: " << endl;
cin >> userIn;
}
if (userIn == 1)
{
displayBalance(balance);
}
if (userIn == 2)
{
deposit(balance);
}
if (userIn == 3)
{
withdraw(balance);
}
if (userIn == 4)
{
displayAccountDetails(firstName, lastName, userAge, balance);
}
else
{
string save;
cout << "Would you like to save your account information?: " << endl;
cout << "yes or no" << endl;
cin >> save;
while ((save != "yes") || (save != "no"))
{
cout << "INVALID. Enter yes or no." << endl;
menuMain();
}
if (save == "yes") //save info to text file
//code to save info to text file
ofstream profileTxt;
profileTxt.open("proj1.txt");
profileTxt << firstName << lastName << userAge << balance << endl;
profileTxt.close();
cout << "Thank you for using the UMBC ATM";
return 0;
}
else
{
cout << "Thank you for using the UMBC ATM";
return 0;
}
}
profileTxt.close();
return 0;
}
void displayBalance(float& accountBalance) //displays account balance
{
string firstName;
string lastName;
int userAge;
float balance;
//open user's profile info*
ifstream profileTxt;
profileTxt.open("proj1.txt");
profileTxt >> firstName >> lastName >> userAge >> balance;
cout << "Account Balance: " << &balance << endl;
profileTxt.close();
menuMain();
}
void deposit(float accountBalance) //deposits into account
{
string firstName;
string lastName;
int userAge;
float balance;
//open user's profile info*
ifstream profileTxt;
profileTxt.open("proj1.txt");
profileTxt >> firstName >> lastName >> userAge >> balance;
float depAmount;
cout << "Please enter the amount to be deposited" << endl;
cin >> depAmount;
if (depAmount < 0)
{
cout << "Amount should be greater than 0" << endl;
profileTxt.close();
menuMain();
}
else
{
balance = balance + depAmount;
cout << depAmount << " deposited to your account";
profileTxt.close();
menuMain();
}
void withdraw(float accountBalance) //withdraws from account
{
string firstName;
string lastName;
int userAge;
float balance;
//open user's profile info*
ifstream profileTxt;
profileTxt.open("proj1.txt");
profileTxt >> firstName >> lastName >> userAge >> balance;
float withAmount;
cout << "Please enter the amount to be withdrawn" << endl;
cin >> withAmount;
if ((withAmount > balance) || (withAmount <0) )
{
cout << "Amount should be greater than 0 and greater than current account balance" << e\
ndl;
profileTxt.close();
menuMain();
}
else
{
balance = balance - withAmount;
cout << withAmount << " withdrawn from your account" << endl;
profileTxt.close();
menuMain();
}
void displayAccountDetails(std::string fName, std::string lName, int age, float accountBalanc\
e)
{
string firstName;
string lastName;
int userAge;
float balance;
//open user's profile info*
ifstream profileTxt;
profileTxt.open("proj1.txt");
profileTxt >> firstName >> lastName >> userAge >> balance;
cout << "First Name : " << firstName << endl;
cout << "Last Name : " << lastName << endl;
cout << "Age : " << userAge << endl;
cout << "Account Balance: " << balance << endl;
profileTxt.close();
menuMain();
}