极客笔记C++ 计费管理系统
用C++编写的超市计费项目 – 这个C++超市计费系统是一个简单的控制台程序，没有任何图形界面。通过这个项目，您将学习如何使用流类和管理C++编程语言中的文件。
什么是超市账单
超市计费系统旨在帮助超市计算和显示发票，以提供更快速、更有效的客户服务。这个软件解决方案的用户界面既高效又用户友好，有助于员工进行客户服务和账单计算。
为什么超市需要计费系统
由于计费软件是各类杂货店企业的最佳选择之一，他们可以使他们的资金有条不紊。一个好的计费程序可以保持准确的财务记录，消除人为的数据输入错误。
超市计费系统有哪些功能
通过确保计费系统透明，并为购买的商品准确标明价格，超市计费系统有助于保持顾客和店铺管理之间良好的关系。它促进并保证了消费者的支付。
导入必要的库
作为第一步，要确定我们的软件需要哪些C++库。这些将在演示开始时给出。我们使用 #include 从库中导入头文件，iostream 是我们的应用程序所需的第一个库。我们将使用这个库来使用C++基本输入和输出管理我们的超市计费项目。
程序分解
# include < iostream >
# include < process.h >
# include < fstream >
# include < stdlib.h >
我们将导入所有必要的库来避免任何类型的错误。
class head
{
char Iname [ 50 ] [ 50 ] ;
public :
int totalitems ;
float Qty [ 3 ] ;
float price [ 3 ] ;
int vatprice [ 3 ] ;
int tprice [ 3 ] ;
void input ( ) ;
void output ( ) ;
} ;
在上述代码中，我们创建了一个名为head的类，它有成员函数name、total items、quantity、price、input和output。
class vat : public head
{
float vats ;
public :
void vatcal ( ) ;
void outputs ( ) ;
void sum ( ) ;
} ;
在上面的代码片段中，我们派生了一个从类head继承的类vat。
void head : : input ( )
{
system ( " CLS " ) ;
cout << " \ nEnter number of items = " ;
cin >> totalitems ;
for ( int i = 0 ; i < totalitems ; i + + )
{
cout << " \ n Enter name of item " << i + 1 << " : " ;
cin >> Iname [ i ] ;
cout << " Enter quantity : " ;
cin >> Qty [ i ] ;
cout << " Enter price of item " << i + 1 << " : " ;
cin >> price [ i ] ;
tprice [ i ] = Qty [ i ] * price [ i ] ;
}
}
在上述场景中，它将负责输入，如添加物品的数量、物品的名称、输入物品的数量和价格。
void head : : output ( )
{
int a ;
ifstream infile ( " COUNT . TXT " ) ;
infile >> a ;
ofstream outfile ( " COUNT . TXT " ) ;
a + = 1 ;
outfile << a ;
outfile . close ( ) ;
{ ofstream outfile ( " HIS . TXT " , ios : : app ) ;
outfile << endl << " Bill No . : " << a << endl ;
outfile << " ------------------------------------------------------------------------ " << endl ;
cout << " \ n " ;
cout << " Name of Item \ t Quantity Price Total Price \ n " ;
for ( int i = 0 ; i < totalitems ; i + + )
{
outfile << " Name : " << Iname [ i ] << " Qty : " << Qty [ i ] << " Price : " << tprice [ i ] << endl ;
cout << Iname [ i ] << " \ t \ t " << Qty [ i ] << " \ t " << price [ i ] << " \ t " << tprice [ i ] << ' \ n ' ;
}
outfile << " ------------------------------------------------------------------------ " << endl ;
outfile . close ( ) ;
}
}
上面的代码片段负责显示用户输入的项目。
void vat : : vatcal ( )
{
input ( ) ;
for ( int i = 0 ; i < totalitems ; i + + )
{
if ( price [ i ] < = 100.00 )
{
vatprice [ i ] = tprice [ i ] + ( 0.03 * tprice [ i ] ) ;
}
else
{
vatprice [ i ] = tprice [ i ] + ( 0.1 * tprice [ i ] ) ;
}
}
} void vat : : vatcal ( )
{
input ( ) ;
for ( int i = 0 ; i < totalitems ; i + + )
{
if ( price [ i ] < = 100.00 )
{
vatprice [ i ] = tprice [ i ] + ( 0.03 * tprice [ i ] ) ;
}
else
{
vatprice [ i ] = tprice [ i ] + ( 0.1 * tprice [ i ] ) ;
}
}
}
上述代码用于计算用户输入的物品数量。
void vat : : outputs ( )
{
output ( ) ;
float cash = 0 , sum = 0 , qty = 0 , sumt = 0 ;
for ( int i = 0 ; i < totalitems ; i + + )
{
sumt + = tprice [ i ] ;
sum + = vatprice [ i ] ;
qty + = Qty [ i ] ;
}
cout << " \ n Total : " ;
cout << " \ n ------------------------------------------------------------------------------ " ;
cout << " \ n \ t Quantity = " << qty << " \ t \ t Sum = " << sumt << " \ tWith Vat : " << sum ;
cout << " \ n------------------------------------------------------------------------------ " ;
pay :
cout << " \ n \ n \ t \ t \ t **** PAYMENT SUMMARY **** \ n " ;
cout << " \ n \ t \ t \ t Total cash given : " ;
cin >> cash ;
if ( cash > = sum )
cout << " \ n \ t \ t \ t Total cash repaid : " << cash-sum << ' \ n ' ;
else
{ cout << " \ n \ t \ t \ t Cash given is less than total amount!!! " ;
goto pay ;
}
}
上面的代码用于显示用户输入的物品的计算价格。
int passwords ( )
{
char p1 , p2 , p3 ;
cout << " \ n \ n \ n \ n \ n \ n \ t \ t \ t ENTER THE PASSWORD : " ;
cin >> p1 ;
cout << " * " ;
cin >> p2 ;
cout << " * " ;
cin >> p3 ;
cout << " * " ;
if ( ( p1 == ' s ' || p1 == ' S ' ) && ( p2 == ' i ' || p2 == ' I ' ) && ( p3 == ' d ' || p3 == ' D ' ) )
return 1 ;
else
return 0 ;
}
上面的代码片段将帮助用户在结算系统中输入密码。这将帮助用户维护超市结算系统的安全性。
int main ( )
{
vat obj ;
char opt , ch ;
int a = 1 ;
ifstream fin ;
a==passwords ( ) ;
if ( ! a )
{
for ( int i = 0 ; i < 2 ; i + + )
{
cout << " \ n Wrong password try once more \ n " ;
if ( passwords ( ) )
{
goto last ;
}
else
{
cout << " \ n \ n \ t \ t \ t all attempts failed ..... " ;
cout << " \ n \ n \ n \ t \ t \ t see you .................. " ;
exit ( 0 ) ;
}
}
cout << " \ t \ t \ t sorry all attempts failed ............. \ n \ t \ t \ t inactive " ;
}
以上代码将是我们超市计费系统的驱动代码。用户将被要求输入密码。如果用户输入的密码错误，则会显示密码错误，请重试。
else {
last : ;
do {
start :
system ( " PAUSE " ) ;
system ( " CLS " ) ;
cout << " \ n \ n \ t \ t \ t ------------------------------ " ;
cout << " \ n \ t \ t \ t Billing Management System " ;
cout << " \ n \ t \ t \ t ------------------------------ " ;
cout <<"\n\n\t\t\tWhat you want to do?";
cout<<"\n\t\t\t1.\tTo enter new entry\n\t\t\t2.\tTo view previous entries\n\t\t\t3.\tExit\n";
cout<<"\n\nEnter your option: ";
cin>>opt;
如果用户输入了正确的密码，那么上面的循环将开始执行。
switch ( opt )
{
case ' 1 ' :
obj . vatcal ( ) ;
obj . outputs ( ) ;
goto start ;
case ' 2 ' :
fin . open ( " HIS . TXT " , ios : : in ) ;
while ( fin . get ( ch ) )
{
cout << ch ;
}
fin . close ( ) ;
goto start ;
case ' 3 ' :
exit ( 0 ) ;
default :
cout << " \ a " ;
}
} while ( opt ! = 3 ) ;
}
return 0 ;
}
上面的循环将根据用户选择的选项运行。
超市计费系统程序
#include<iostream>
#include<process.h>
#include<fstream>
#include <stdlib.h>
using namespace std;
class head
{
char Iname[50][50];
public:
int totalitems;
float Qty[3];
float price[3];
int vatprice[3];
int tprice[3];
void input();
void output();
};
class vat:public head
{
float vats;
public:
void vatcal();
void outputs();
void sum();
};
//******************************************************************
// INPUT FUNCTION
//******************************************************************
void head::input()
{
system("CLS");
cout<<"\nEnter number of items= ";
cin>>totalitems;
for(int i=0; i<totalitems; i++)
{
cout<<"\nEnter name of item "<<i+1<<": ";
cin>>Iname[i];
cout<<"Enter quantity: ";
cin>>Qty[i];
cout<<"Enter price of item "<<i+1<<": ";
cin>>price[i];
tprice[i]=Qty[i]*price[i];
}
}
//* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
// OUTPUT FUNCTION
//* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
void head::output()
{
int a;
ifstream infile("COUNT.TXT");
infile>>a;
ofstream outfile("COUNT.TXT");
a+=1;
outfile<<a;
outfile.close();
{ofstream outfile("HIS.TXT", ios::app);
outfile<<endl<<"Bill No.: "<<a<<endl;
outfile<<"------------------------------------------------------------------------"<<endl;
cout<<"\n";
cout<<"Name of Item\tQuantity Price Total Price\n";
for(int i=0;i<totalitems;i++)
{
outfile<<"Name: "<<Iname[i]<<" Qty: "<<Qty[i]<<" Price: "<<tprice[i]<<endl;
cout<<Iname[i]<<"\t\t"<<Qty[i]<<"\t "<<price[i]<<"\t "<<tprice[i]<<'\n';
}
outfile<<"------------------------------------------------------------------------"<<endl;
outfile.close();
}
}
//* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
// VAT CALCULATION
//* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
void vat::vatcal()
{
input();
for(int i=0;i<totalitems;i++)
{
if(price[i]<=100.00)
{
vatprice[i]=tprice[i]+(0.03*tprice[i]);
}
else
{
vatprice[i]=tprice[i]+(0.1*tprice[i]);
}
}
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
// VAT OUTPUTS
//* * * * * * * * * * * * * * * * * * * * * ** * * * * * * * * * * * * * * * * * * * * * * * * *
void vat::outputs()
{
output();
float cash=0,sum=0,qty=0,sumt=0;
for(int i=0;i<totalitems;i++)
{
sumt+=tprice[i];
sum+=vatprice[i];
qty+=Qty[i];
}
cout<<"\nTotal:";
cout<<"\n------------------------------------------------------------------------------";
cout<<"\n\tQuantity= "<<qty<<"\t\t Sum= "<<sumt<<"\tWith Vat:"<<sum;
cout<<"\n------------------------------------------------------------------------------";
pay:
cout<<"\n\n\t\t\t * * * * PAYMENT SUMMARY * * * * \n";
cout<<"\n\t\t\tTotal cash given: ";
cin>>cash;
if(cash>=sum)
cout<<"\n\t\t\tTotal cash repaid: "<<cash-sum<<'\n';
else
{ cout<<"\n\t\t\tCash given is less than total amount!!!";
goto pay;
}
}
//* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
// PROTECTION PASSWORD
//* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
int passwords()
{
char p1,p2,p3;
cout<<"\n\n\n\n\n\n\t\t\tENTER THE PASSWORD: ";
cin>>p1;
cout<<"*";
cin>>p2;
cout<<"*";
cin>>p3;
cout<<"*";
if ((p1=='s'||p1=='S')&&(p2=='i'||p2=='I')&&(p3=='d'||p3=='D'))
return 1;
else
return 0;
}
// END of Password.
//****************************************************************
// THE MAIN FUNCTION OF PROGRAM
//****************************************************************
int main()
{
vat obj;
char opt, ch;
int a=1;
ifstream fin;
a==passwords();
if(!a)
{
for(int i=0;i<2;i++)
{
cout<<"\nWrong password try once more\n";
if(passwords())
{
goto last;
}
else
{
cout<<"\n\n\t\t\t all attempts failed.....";
cout<<"\n\n\n\t\t\t see you.................. ";
exit(0);
}
}
cout<<"\t\t\t sorry all attempts failed............. \n \t\t\tinactive";
}
else{
last:;
do{
start:
system("PAUSE");
system("CLS");
cout<<"\n\n\t\t\t------------------------------";
cout<<"\n\t\t\tBilling Management System";
cout<<"\n\t\t\t------------------------------";
cout<<"\n\n\t\t\tWhat you want to do?";
cout<<"\n\t\t\t1.\tTo enter new entry\n\t\t\t2.\tTo view previous entries\n\t\t\t3.\tExit\n";
cout<<"\n\nEnter your option: ";
cin>>opt;
switch(opt)
{
case'1':
obj.vatcal();
obj.outputs();
goto start;
case'2':
fin.open("HIS.TXT", ios::in);
while(fin.get(ch))
{
cout<<ch;
}
fin.close();
goto start;
case'3':
exit(0);
default:
cout<<"\a";
}
}while(opt!=3);
}
return 0;
}
输出：
ENTER THE PASSWORD: 123
***Press any key to continue . . .
---------------------------------------
Billing Management System
---------------------------------------
What you want to do?
1. To enter new entry
2. To view previous entries
3. Exit
Enter your option: 1
Enter number of items= 3
Enter name of item 1: Vegetables
Enter quantity: 1kg
Enter price of item 1:
Enter name of item 2: Enter quantity: Enter price of item 2:
Enter name of item 3: Enter quantity: Enter price of item 3:
Name of Item Quantity Price Total Price
Vegetables 1 0 0
0 1.4013e-045 0
1.13027e-038 0 0
Total:
------------------------------------------------------------------------------
Quantity= 1 Sum= 0 With Vat:0
------------------------------------------------------------------------------
****PAYMENT SUMMARY****
Total cash given:
Total cash repaid: 0
Press any key to continue . . .