Customer Bill and Product Database-Applications of Programming-C Plus Plus Code, Exercises for Applications of Computer Sciences. Mody Institute of Information and Technology Sciences
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omni1 August 2012

Customer Bill and Product Database-Applications of Programming-C Plus Plus Code, Exercises for Applications of Computer Sciences. Mody Institute of Information and Technology Sciences

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Applications of different concepts in programming are in this code. These can be used in learning C plus plus. It includes: Include, Definition, Customer, Class, Friend, Declaration, Function, Public, Private, Construct...
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/****************** Assignment No. 3 : Solution

**********************/

using namespace std;

#include<iostream>

#include <cstring>

#include <conio.h>

// Definition of customer class

class customer{

friend double calculateBill(customer*); // Declaration of

Non-member friend function

private:

char name[30];

int custID;

double spending;

double tax;

double discount;

public:

customer(); //Default

constructor

customer(char[], int, double); //Parameterized

constructor

/*Setter and getter functions for the class*/

void setName(char[]);

void setID(int);

void setSpending(double);

char* getName();

int getID();

double getSpending();

};

// Default constructor Definition

customer::customer()

{

strcpy(name, "No Name");

custID = 0;

spending = tax = discount = 0;

}

// Parameterized constructor Definition

customer :: customer(char Name[], int ID, double Spending)

{

strcpy(name, Name);

custID = ID;

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spending = Spending;

tax = 0;

discount = 0;

}

//Definition of setter and getter functions

void customer :: setName(char Name[])

{

strcpy(name, Name);

}

void customer :: setID(int ID)

{

custID = ID;

}

void customer :: setSpending(double Spending)

{

spending = Spending;

}

char* customer :: getName()

{

return name;

}

int customer :: getID()

{

return custID;

}

double customer :: getSpending()

{

return spending;

}

/* Defining friend function calculateBill which takes an object as

parameter and calculates total bill

after adding tax and subtracting discount from the bill*/

double calculateBill(customer *obj)

{

double bill = 0;

if(obj->spending <= 5000) //if the spending is less than 5000,

then tax is 5% and discount is 1%

{

obj->tax = obj->spending * 5 / 100;

obj->discount = obj->spending * 1 / 100;

bill = obj->spending + obj->tax - obj->discount;

}

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else if(obj->spending > 5000 && obj->spending <=10000) //if the

spending is more than 5000 and less than 10000, then tax is 10% and

discount is 2%

{

obj->tax = obj->spending * 10 / 100;

obj->discount = obj->spending * 2 / 100;

bill = obj->spending + obj->tax - obj->discount;

}

else //if the spending is more than than 10000, then tax is

15% and discount is 3%

{

obj->tax = obj->spending * 15 / 100;

obj->discount = obj->spending * 3 / 100;

bill = obj->spending + obj->tax - obj->discount;

}

return bill; // Function returns the final value of bill

calculated in one of above three condition blocks

}

int main(){

char NAME[30];

int id = 0;

double Spending = 0;

//Creating object with default constructor

customer *cus1 = new customer(); //cus1 is a pointer to an object of

type customer

/*Following code is showing the values of data members of object pointed

by cus1*/

cout << "Bill detail for customer 1, initialized with default

constructor" <<endl;

cout <<"Customer Name : " << cus1->getName() << endl << "ID : " << cus1-

>getID() << endl << "Spending : " << cus1->getSpending() << endl <<

"Total Bill : " << calculateBill(cus1) << endl;

cout << endl << endl;

//Creating object with parameterized construcor

customer *cus2 = new customer("Ali", 112, 8550);

/*Following code is showing the values of data members of object pointed

by cus2*/

cout << "Bill detail for customer 2, initialized with parameterized

constructor" <<endl;

cout <<"Customer Name : " << cus2->getName() << endl << "ID : " << cus2-

>getID() << endl << "Spending : " << cus2->getSpending() << endl <<

"Total Bill : " << calculateBill(cus2) << endl;

cout << endl << endl;

//Creating object with default constructor

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customer *cus3 = new customer();

/*The following code takes input in three ordinary variables and then

these variables are passed to

object pointed by the pointer cus3, through setter functions*/

cout << "Enter name of customer 3 : ";

cin >> NAME;

cout << "Enter ID of customer 3 : ";

cin >> id;

cout << "Enter total spending of customer 3 : ";

cin >> Spending;

cus3->setName(NAME);

cus3->setID(id);

cus3->setSpending(Spending);

cout << endl;

//Showing the values of object pointed by the pointer cus3.

cout << "Bill detail for customer 3, input entered by the user" <<endl;

cout <<"Customer Name : " << cus3->getName() << endl << "ID : " << cus3-

>getID() << endl << "Spending : " << cus3->getSpending() << endl <<

"Total Bill : " << calculateBill(cus3) << endl;

cout << endl << endl;

getch();

}

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