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I have a new question on how to make the program start from the beginning

aqum (8)
This is what I have so far. So basically I need Fine to display whatever number as long as it's below 5 and if it's 5 or greater than 5 it has to display 5. Thanks in advance!

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  switch (booktype)
	{
		case Pback	: cout << "Enter the number of days overdue: \n";
					cin  >> daysoverdue;
						while (daysoverdue < 0)																		
							{ 
								cout << "Please enter a number greater than or equal to zero: ";
								cin >> daysoverdue;
							}
						fine = daysoverdue * .25;
						if (fine >= 5)
						{
							cout << "Your fine is: " << fine;
						}

					break;
Last edited on
JLBorges (13770)
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fine = daysoverdue * 0.25 ;
if( fine > 5.0 ) fine = 5.0 ; 
std::cout << "Your fine is: " << fine << '\n' ;

aqum (8)
Hey thank you for responding. I need help making my program restart. By that I mean making it start from the beginning if I put in Y for Yes towards the bottom.
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#include <iostream>
#include <cmath>
#include <string>

using namespace std;


string name;																										// Variables
string ad;
string booktitle;

char restart;

int booktype;

double cardnum, charges, daysoverdue, fine;

enum BookType {Pback = 1, PbackB, Mag, HBook};
int main()
{
	cout << "Enter your library card number:" << endl;
	cin >> cardnum;
	if (cardnum >= 0000 && cardnum <= 9999)																			// Makes sure the card number is above 0000 and below 9999 and if not it it makes you enter it again
	{}

	else
	{
		cout << "\nYour card number is incorrect.\n" << "Please enter it again: " << endl;
		cin >> cardnum;
	}

	cardnum = cardnum;

	cin.ignore();
	cin.clear();

	cout << "\nEnter your name:" << endl;
	getline(cin, name);

	cout << "\nEnter your address:" << endl;
	getline(cin, ad);

	cout << "\nEnter the title of the book:" << endl;
	getline(cin, booktitle);



	/*cout << "\nIs this information correct?\n" << "\n"<< "Card Number: " << cardnum << "\n"<< "Name: " << name << "\n"<< "Address: " << ad << "\n"<< "Book Title: " << booktitle << endl;
	system("pause");*/


	int Booktype();

	cout << "\n1. PaperBack-Regular\n";
	cout << "2. PaperBack-Bestseller\n";
	cout << "3. Magazine\n";
	cout << "4. Hardcover\n";
	cout << "\nEnter number corresponding to the type of book(1 - 4): \n";
	cin >> booktype;
	while (booktype > 4)																							// Make sure the number entered corresponds to one of the numbers shown in the menu.		
	{
		cout << "Enter a number corresponding to the type of book(1 - 4): \n";
		cin >> booktype;
	}
	cin.ignore();
	cin.clear();

	switch (booktype)
	{
		case Pback	: cout << "Enter the number of days overdue: \n";
					cin  >> daysoverdue;
						while (daysoverdue < 0)																		// Make sures the number entered is above 0.
							{ 
								cout << "Please enter a number greater than or equal to zero: ";
								cin >> daysoverdue;
							}
						fine = daysoverdue * .25;
							if (fine > 5.0) fine = 5.0;
							{
								cout << "\nYour fine is: $" << fine << endl;
							}

					break;
		case PbackB	: cout << "Enter the number of days overdue: \n";
					  cin >> daysoverdue;
						while (daysoverdue < 0)
							{
								cout << "Please enter a number greater than or equal to zero: ";
								cin >> daysoverdue;
							}
						fine = daysoverdue * .50;
							if (fine > 10.0) fine = 10.0;
							{
								cout << "\nYour fine is: $" << fine << endl;
							}

					  break;
		case Mag	: cout << "Enter the number of days overdue: \n";
					  cin >> daysoverdue;
						while (daysoverdue < 0)
							{
								cout << "Please enter a number greater than or equal to zero: ";
								cin >> daysoverdue;
							}
						fine = daysoverdue * .25;
						if (fine > 4.0) fine = 4.0;
						{
							cout << "\nYour fine is: $" << fine << endl;
						}
					  break;
		case HBook	: cout << "Enter the number of days overdue: \n";
					  cin >> daysoverdue;
						while (daysoverdue < 0)
							{
								cout << "Please enter a number greater than or equal to zero: ";
								cin >> daysoverdue;
							}
						fine = daysoverdue * .30;
						if (fine > 20.0) fine = 20.0;
						{
							cout << "\nYour fine is: $" << fine << endl;
						}
					  break;

		system("pause");

	}

	cout << "Would you like to perform another transaction? (Y/N)" << endl;
	cin >> restart;

	system("pause");
	return 0;


	}
aqum (8)
Hi I added
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cout << "Would you like to perform another transaction? (Y/N)" << endl;
	cin >> restart;
	if (restart == 'Y' || restart == 'y');
	{

	}


But I still need help make the program start from the beginning again.
pearlyman (176)
Without a rewrite of your code (Strongly suggested) You could simply put

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if (restart=='y'){
        main();
	}


starting @ line 134.

Your switch needs a default, and you should get rid of the global variables and learn to do functions.




A code rewrite could look something like this, but I'm going to warn you... though this works, I cheated a little. This is not the best code, however it'll give you an idea on functions.

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#include <iostream>
#include <string>
#include <cstdlib>

using namespace std;

// Prototypes

int getNumber(int);
string getName(string);
string getAdress(string);
string getTitle(string);
void getType();

int main()
{

// Variables are now local
string name;																										
string ad;
string booktitle;
char restart;
int cont=1;
int cardnum=0;

while (cont==1)
{
    cardnum = getNumber(cardnum);
    cin.ignore();
	name=getName(name);
	ad=getAdress(ad);
	booktitle=getTitle(booktitle);
	getType();
	cout << endl;

    /*cout << "\nIs this information correct?\n" << "\n"<< "Card Number: " << cardnum << "\n"<< "Name: " << name << "\n"<< "Address: " << ad << "\n"<< "Book Title: " << booktitle << endl;
	system("pause");*/
	cout << "Would you like to perform another transaction? (Y/N)" << endl;
	cin >> restart;
	if (restart!='y'){
        cont=0;
	}
}
	return 0;
	}

// Functions start here

int getNumber(int cardnum){
    cout << "Enter your library card number:" << endl;
	cin >> cardnum;
	if (cardnum<0 || cardnum>9999){
		cout << "\nYour card number is incorrect.\nPlease enter it again: " << endl;
		getNumber(cardnum);
	}
	else {
            return cardnum;
	}
}

string getName(string name){
    cout << "\nEnter your name:" << endl;
	getline(cin, name);
	return name;
}

string getAdress(string ad){
cout << "\nEnter your address:" << endl;
	getline(cin, ad);
	return ad;
}

string getTitle(string booktitle){
    cout << "\nEnter the title of the book:" << endl;
	getline(cin, booktitle);
	return booktitle;
}

void getType(){
    int booktype,daysoverdue=0;
    double fine =0.0;
    //enum BookType {Pback = 1, PbackB, Mag, HBook};

    cout << "\n1. PaperBack-Regular\n";
	cout << "2. PaperBack-Bestseller\n";
	cout << "3. Magazine\n";
	cout << "4. Hardcover\n";
	cout << "\nEnter number corresponding to the type of book(1 - 4): \n";

	cin >> booktype;

	if (booktype <1 || booktype >4)
        {
		cout << "Incorrect value: 1-4 please  ";
		getType();
		}
		else{

	switch (booktype){
                case 1:
                     cout << "Enter the number of days overdue: \n";
					 cin  >> daysoverdue;
						while (daysoverdue < 0)																		// Make sures the number entered is above 0.
							{
								cout << "Please enter a number greater than or equal to zero: ";
								cin >> daysoverdue;
							}
						fine = daysoverdue * .25;
							if (fine > 5.0) fine = 5.0;
							{
								cout << "\nYour fine is: $" << fine << endl;
							}

					break;
                case 2:
                     cout << "Enter the number of days overdue: \n";
					 cin >> daysoverdue;
						while (daysoverdue < 0)
							{
								cout << "Please enter a number greater than or equal to zero: ";
								cin >> daysoverdue;
							}
						fine = daysoverdue * .50;
							if (fine > 10.0) fine = 10.0;
							{
								cout << "\nYour fine is: $" << fine << endl;
							}

					  break;
                case 3:
                     cout << "Enter the number of days overdue: \n";
					 cin >> daysoverdue;
						while (daysoverdue < 0)
							{
								cout << "Please enter a number greater than or equal to zero: ";
								cin >> daysoverdue;
							}
						fine = daysoverdue * .25;
						if (fine > 4.0) fine = 4.0;
						{
							cout << "\nYour fine is: $" << fine << endl;
						}
					  break;
                case 4:
                     cout << "Enter the number of days overdue: \n";
                     cin >> daysoverdue;
						while (daysoverdue < 0)
							{
								cout << "Please enter a number greater than or equal to zero: ";
								cin >> daysoverdue;
							}
						fine = daysoverdue * .30;
						if (fine > 20.0) fine = 20.0;
						{
							cout << "\nYour fine is: $" << fine << endl;
						}
					  break;

					  default: cout << "Just give me all your cash!" << endl;
}
}
}
Last edited on
aqum (8)
Thank you for the suggestions I was just about to make everything neat and tidy. I added the restart and now it keeps restarting even when I don't enter Y for yes.
JLBorges (13770)
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#include <iostream>

int main()
{
    char do_this_once_again ;

    do
    {
        // do something

        std::cout << "would you like to do this once again? (y/n)? " ;
        std::cin >> do_this_once_again ;
    }
    while( do_this_once_again == 'Y' || do_this_once_again == 'y' ) ;
}
aqum (8)
Thank you so much pearlyman and JLBorges!!!!
AbstractionAnon (6954)
pearlyman wrote:

Without a rewrite of your code (Strongly suggested) You could simply put
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if (restart=='y'){
        main();
	}


No. Recursive calls to main are NOT allowed in C++.
Last edited on
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