将对象作为参数，以评估方法
Passing object as argument, for function to evaluate method
我正在使用Microsoft Visual Studios。
我正在尝试模仿我在Java中使用的过程，但是很难。
我希望能够将对象的名称从类中传递到作为其参数的函数中。然后使该函数评估对象传递的对象中方法的值。
该程序适用于模拟的旧学校口香糖分配机器。
编辑＃2：
好的，通过并重新编辑了代码。现在，我收到了一条巨大的错误消息，但它仅在一个部分...
代码：
//Vintage Gum Vending Machine (A4)
#include <iostream>
#include <math.h>
using namespace std;
//input select
char input;
//gum stock
class Gum {
public:
Gum(string Name, int Stock) {
Name = name;
Stock = stock;
};
int stock;
string name;
};
Gum Beemans ("Beemans",10);
Gum Dentyne ("Dentyne", 10);
Gum Chiclets ("Chiclets", 10);
Gum Carefree ("Carefree", 10);
//Main Welcome Menu
void welcomeMenu();
//coin queue of deposited quarters
float Queue = 0.00;
//coin deposit quarter drop
void dropQuarter();
//Tab pulled function
void pulltab(Gum& gum);
//Money in the Machine
float Vault = 0.00;
//Empty deposit queue into vault
void resetQueue();
//restock machine
void restock();
int main()
{
welcomeMenu();
do
{
//take menu choice
cin >> input;
switch (input)
{
case 's' : cout << "Stock Status: " <<endl
<< "1: Beemans: " << Beemans.stock <<endl
<< "2: Dentyne: " << Dentyne.stock <<endl
<< "3: Chiclets: "<< Chiclets.stock <<endl
<< "4: Carefree: "<< Carefree.stock <<endl
<< "There is $" << Vault << " in the machine" <<endl;
break;
case 'd' : cout << "You drop in a quarter n Clink " <<endl;
dropQuarter();
break;
case '1' : cout << "You reach for the 1st tab and" <<endl;
pulltab(Beemans);
break;
case '2' : cout << "You reach for the 2nd tab and" <<endl;
pulltab(Dentyne);
break;
case '3' : cout << "You reach for the 3rd tab and" <<endl;
pulltab(Chiclets);
break;
case '4' : cout << "You reach for the 4th tab and" <<endl;
pulltab(Carefree);
break;
case 'r' : cout << "You call the store clerk to restock the machine " <<endl;
break;
case 'q' : cout << "quiting program " <<endl;
break;
default : cout << "Please select a choice from the menu" <<endl;
welcomeMenu();
cout << "Please select a choice from the menu" <<endl;
break;
}
} while (input != 'q');
return 0;
};
void welcomeMenu()
{
cout << "s - view stock status " <<endl;
cout << "d - drop in a quarter " <<endl;
cout << "1 - pull 1st tab " <<endl;
cout << "2 - pull 2nd tab " <<endl;
cout << "3 - pull 3rd tab " <<endl;
cout << "4 - pull 4th tab " <<endl;
cout << "r - restock the machine " <<endl;
cout << "q - quit " <<endl;
cout << "(make your selection then press enter)"<<endl;
};
void dropQuarter(){
Queue += 0.25;
};
void pulltab(Gum& gum){
if(gum.stock >=1 && Queue>=0.75){
cout<< "pull the tab out." << endl
<< "The machine dispenses a pack of " << gum.name << "." <<endl
<< "After taking the pack of gum, you push the tab back in." <<endl;
gum.stock -= 1;
resetQueue();
}
else if(gum.stock==0 && Queue>=0.75){
cout<< "pull the tab out." <<endl
<< "But no " << gum.name << "comes out of the slot..." <<endl
<< "(Hint: did you check to see if the gum was in stock before depositing your money in this simulated 1960s gum machine?)" <<endl;
resetQueue();
}else if(Queue<0.75) {
cout << "pull on the tab, but it doesn't budge..."<<endl
<< "(Hint: Gum costs 75 ¢ ... have you dropped in at least 3 quarters?)" <<endl;
}
};
void resetQueue(){
Vault += Queue;
Queue = 0.00;
};
错误（对不起，它太大了）：
1>------ Build started: Project: Assignment 4, Configuration: Debug Win32 ------
1> Assignment 4.cpp
1>c:usersmarkdesktopacademiccsassignment4assignment4assignment 4.cpp(146): error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'std::string' (or there is no acceptable conversion)
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(695): could be 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(742): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(780): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(827): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(953): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const signed char *)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(960): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,signed char)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(967): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const unsigned char *)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(974): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,unsigned char)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(984): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>,std::string>(std::basic_ostream<_Elem,_Traits> &&,const _Ty &)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>,
1> _Ty=std::string
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(1101): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const std::error_code &)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(201): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::basic_ostream<_Elem,_Traits> &(__cdecl *)(std::basic_ostream<_Elem,_Traits> &))'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(207): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::basic_ios<_Elem,_Traits> &(__cdecl *)(std::basic_ios<_Elem,_Traits> &))'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(214): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::ios_base &(__cdecl *)(std::ios_base &))'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(221): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::_Bool)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(241): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(short)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(275): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(unsigned short)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(295): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(int)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(320): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(unsigned int)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(340): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(long)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(360): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(unsigned long)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(381): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(__int64)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(401): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(unsigned __int64)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(422): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(float)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(442): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(double)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(462): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(long double)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(482): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(const void *)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(502): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::basic_streambuf<_Elem,_Traits> *)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> while trying to match the argument list '(std::basic_ostream<_Elem,_Traits>, std::string)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1>c:usersmarkdesktopacademiccsassignment4assignment4assignment 4.cpp(153): error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'std::string' (or there is no acceptable conversion)
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(695): could be 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(742): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(780): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(827): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(953): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const signed char *)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(960): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,signed char)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(967): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const unsigned char *)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(974): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,unsigned char)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(984): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>,std::string>(std::basic_ostream<_Elem,_Traits> &&,const _Ty &)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>,
1> _Ty=std::string
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(1101): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const std::error_code &)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(201): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::basic_ostream<_Elem,_Traits> &(__cdecl *)(std::basic_ostream<_Elem,_Traits> &))'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(207): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::basic_ios<_Elem,_Traits> &(__cdecl *)(std::basic_ios<_Elem,_Traits> &))'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(214): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::ios_base &(__cdecl *)(std::ios_base &))'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(221): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::_Bool)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(241): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(short)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(275): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(unsigned short)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(295): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(int)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(320): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(unsigned int)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(340): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(long)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(360): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(unsigned long)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(381): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(__int64)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(401): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(unsigned __int64)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(422): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(float)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(442): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(double)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(462): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(long double)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(482): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(const void *)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:program files (x86)microsoft visual studio 11.0vcincludeostream(502): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::basic_streambuf<_Elem,_Traits> *)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> while trying to match the argument list '(std::basic_ostream<_Elem,_Traits>, std::string)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
首先，pulltab将指针指向对象，您将其称为不一致。Beemans和其他口香糖指针应在没有 *或＆amp;的情况下传递给该功能。这样称呼它，您也有内存泄漏。在C 中，您需要删除使用New创建的对象。如果我是你，我不会打扰新的关键字。只要这样做，
现在，如果您接受我的建议，则应将" ->"更改为'。用于调用功能。
// Tab pulled function - fixed prototype to use pass by reference
// Do the same in the implementation
void pulltab(Gum& theGum);
// create objects like this. You can leave it global or do it in the body of main
Gum Beemans("Beemans",10);
// call it like this
pulltab(Beemans);
// Invoke functions and access attributes like this
if(gum.stock >= 1 && Queue >= 0.75){ // body of block }
这是基础。从Java到C 处理指针，一开始似乎很奇怪，因此尽可能多地避免使用。尽可能使用参考，智能指针和容器。
您应该得到此错误：
错误：太多的论点无法函数'void pulltab（）'
您需要这样声明原型：
//Tab pulled function
void pulltab(Gum *gum);
现在，您应该有一个错误：
错误：无法将"口香糖"转换为"口香糖*"，以" 1"为" void pulltab（gum*）"
'
由于您将指向Gum的指针如下：Gum *Beemans = new Gum("Beemans",10);，因此您需要通过这样的参数：pulltab(Beemans);。对其他呼叫（没有&）做同样的事情。
之后，您将收到以下错误：
错误："操作员＆lt;＆lt;’无匹配（操作数类型为'std :: basic_ostream’和''） ＆lt;＆lt;"机器分配一包"＆lt;＆lt;口香糖 -> getName＆lt;＆lt;"。"＆lt;＆lt;endl
您忘记了括号。您应该以这样的方式调用类成员功能：gum->getName()
这应该对您有帮助。
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