miken5678

my project is.. listed below.. keep in mind this is the beginning of my c++ class and we do have some knowledge of loops but as far as nesting the loops ending them within nestings and counters/accumulators.. i am stuck. any help would be appreciated


Include a welcome screen for the program below.

Write a menu driven program to calculate monthly member rates for a health spa with the following options:

1. AARP Rate //this is for person's 50 and older. $29.95 per month.
2. Student Rate // this is for persons less than 18 years old. $19.95 per month.
3. Regular Rate //for everyone else is $45.95 per month.
4. Exit //this end the program.

Ask the user to enter the number of months they want to join. (Don't allow negative numbers. Keep prompting the user to enter a positive value. Pre-test loop.)

Then ask the user for their age (Don't allow negative numbers and keep prompting until the user enters a positive number. Pre-test loop.)

Provide the user with the opportunity to run the program till they want to stop. (Do you want to run the program again?)

If the user says Y or y, run the program again. Otherwise, end the program. (Post test loop).

Before the program ends, tell the user how many times the program was run (add a count). Also tell the user how much money in fees what calculated (accumulator).

miken5678

this is my code so far using bloodshed

#include <cstdlib>
#include <iostream>
#include <iomanip>
using namespace std;

int main(int argc, char *argv[])
{
int choice, months, age, count=0, sum=0;
double charges;

cout << fixed << showpoint << setprecision(2);

do
{
cout << "\n\t\tHealth Spa Rate Calculator Menu\n\n";
cout << " 1. AARP Rate\n";
cout << " 2. Student Rate\n";
cout << " 3. Regular Rate\n";
cout << " 4. Exit\n\n";
cout << "Enter Your Choice: ";
cin >> choice;
while (choice >= 1 && choice <= 3)
{
cout << "Enter Your Age: ";
cin >> age;
while (age <= 0)
{
cout << "\nInvalid\n";
cout << "Enter Age ";
cin >> age;
}
cout << "For how many months?: ";
cin >> months;
while (months <= 0)
{
cout << "\nInvalid\n";
cout << "Enter Months ";
cin >> months;
}
if (choice = 1)
{
charges = months * 29.95;
cout << "The total charge is $";
cout << charges << endl;
}
else if (choice = 2)
{
charges = months * 19.95;
cout << "The total charge is $";
cout << charges << endl;
}
else if (choice = 3)
{
charges = months * 19.95;
cout << "The total charge is $";
cout << charges << endl;
}
else
{
cout << "The valide choices are 1 through 4.\n";
cout << "Try again. \n";
}

} while (choice !=4);
return EXIT_SUCCESS;
}

Deckard

Your else "valid choices are 1-4" will never be reached because you are only entering in that block of code if choice is between 1 and 3 (which are all valid).

Here is an alternate take on the logic:

1. get choice from user.
2. if choice <1 or >4 then print error and go to step 1.
3. else if choice <4 (i.e., 1, 2, or 3)
   1. increment # of times run
   2. get number of months (can someone join for less than a month?)
   3. get age (is zero positive or negative? )
   4. calculate and output cost. add cost to total session amount.
   5. ask user if they want to continue [Y/N]. Loop until Y/y or N/n.
4. if choice = 4 OR user chose to end (Y/y), print out # of times run, total session amount, and quit.
5. otherwise, loop back to step 1.

miken5678

since im still new to loops bear with me

i understand what your saying and can do most of the items on there own but integrating them together and getting them to function together is another issue..

i take it the items you suggested could all be done within the one do while menu group.. ? i tried doing another while loop after the pretest do while and the compiler would never go through them when i tried to run it

techsoul

when is your project due?

Deckard

Sure, here's less of an outline and more code to give you an idea. There are a few ways to do this, but this should get you started.

techsoul

mate you got the above "if condition" wrong. It should be

if (choice < 1 || choice > 4)
{
// invalid choice
}

Deckard

You're right. It was a test. You passed.

miken5678

my mind was stuck in trying to validate the users selection in the do while list with the age input to make sure they were eligible for the selection they chose.. instead it worked out to this


#include <cstdlib>
#include <iostream>
#include <iomanip>

using namespace std;

const double AARP_RATE = 29.95;
const double STUDENT_RATE = 19.95;
const double REGULAR_RATE = 49.95;

int main(int argc, char *argv[])
{
char option;
int age, months, count = 0;
double rate, totalBill, totalSum = 0;
cout << fixed << setprecision(2);
//welcome
system("CLS");
cout << "\n\n\n\n\n\n"
<< "\n\t\t\t**************************************"
<< "\n\t\t\t* *"
<< "\n\t\t\t* Welcome to the C++ Health Club! *"
<< "\n\t\t\t* Our job is to help you work both *"
<< "\n\t\t\t* body and mind. *"
<< "\n\t\t\t* *"
<< "\n\t\t\t**************************************"
<< "\n\n\n\n\n\n\n\n\n\n\n";
system("PAUSE");

do
{
//display the menu
system("CLS");
cout << "\n\n\n\n\t\t\tAARP Rate (50 or more years)"
<< "\n\n\t\t\tStudent Rate (18 or less years)"
<< "\n\n\t\t\tRegular Rate (everyone else)"
<< "\n\n\n\n\t\t\tHow old are you? ";

//get the age
cin >> age;
//validate the input
while (age < 0)
{
cout << "\n\n\t\tInvalid! Enter a positive number.";
cout << "\n\n\t\tHow old are you? ";
cin >> age;
}
//process the age
if (age <= 18)
{
cout << "\n\n\t\tYou qualify for the student rate which is $19.95.";
rate = STUDENT_RATE;
}
else if (age < 50)
{
cout << "\n\n\t\tYou qualify for the regular rate at $45.95.";
rate = REGULAR_RATE;
}
else
{
cout << "\n\n\t\tYou qualify for the AARP rate at $29.95";
rate = AARP_RATE;
}
//get the months
cout << "\n\n\t\tHow many months do you want to join? ";
cin >> months;
//validate the input
while (months < 0)
{
cout << "\n\n\t\tInvalid! Enter a positive number.";
cout << "\n\n\t\tHow many months do you want to join? ";
cin >> months;
}
//calculate the bill
totalBill = months * rate;
//display the bill
system("CLS");
cout << "\n\n\n\n\n\n\t\tYour total bill is: $" << totalBill << endl << endl
<< endl << endl << endl << endl << endl;
//add to counter & accumulator
count += 1;
totalSum += totalBill;

cout << "\n\n\t\tRun the program again? (Y/N) ";
cin >> option;
} while (option == 'y' || option == 'Y');
//display farewell and summary
system("CLS");
cout << "\n\n\n\n\n\n"
<< "\n\t\t*********************************************"
<< "\n\t\t* "
<< "\n\t\t* Thank you for visitng C++ Health Club! "
<< "\n\t\t* We hope you enjoyed your stay. "
<< "\n\t\t* "
<< "\n\t\t* " << count << " people(s) used this program"
<< "\n\t\t* $" << totalSum << " was spent. "
<< "\n\t\t* "
<< "\n\t\t*********************************************"
<< "\n\n\n\n\n\n\n\n\n\n\n";
system("PAUSE");
return EXIT_SUCCESS;
}

miken5678

this class is moving so fast its almost hard to keep up

now im having to go in and change this program to modular

welcome function
error function
function to calculate the total (use one and pass it values)
functions to collect input (age and numbers of months...getAge - don't allow negative ages. getMos - don't allow negative months).

this should be interesting.. not horribly hard.. but any issues i should note before jumping into functions?

miken5678

the only issue i ended up with on the above completed program was entering letters and decimal numbers.. it caused unexpected results that i didnt know how to account for.. but it wasnt required so im on to functions

miken5678

i appreciate the help so far.. very much so.. thanks

techsoul

good for you, happy coding :)

Deckard

Validating input is not too complicated, I'm sure you'll be introduced to it in class. I can't think of anything that will surprise you in a function -- just remember to keep it simple and try not to repeat yourself in code.

miken5678

ok this has changed to make the program modular.

i got bits and pieces to work but an unclear about how to get a function to work inside the do stream.. also noted that i cannot get the final screen to pop up after n is entered

it is stated

functions to collect input (age and numbers of months...getAge - don't allow negative ages. getMos - don't allow negative months).
function to calculate the total (use one and pass it values)

maybe that is where i am going wrong.. advice is appreciated

miken5678

//Michael J. Nelson
#include <cstdlib>
#include <iostream>
#include <iomanip>

using namespace std;

const double AARP_RATE = 29.95;
const double STUDENT_RATE = 19.95;
const double REGULAR_RATE = 49.95;
void welcome();
void exit();
void month(int);
void ages(int);
//void months(int)
//void age(int)

int main(int argc, char *argv[])
{
char option;
int age, months, count = 0;
double rate, totalBill, totalSum = 0;
cout << fixed << setprecision(2);
//welcome
system("CLS");

welcome();


do
{
//display the menu
system("CLS");
ages;
//validate the input
while (age < 0)
{
cout << "\n\n\t\tInvalid! Enter a positive number.";
cout << "\n\n\t\tHow old are you? ";
cin >> age;
}
//process the age
if (age <= 18)
{
cout << "\n\n\t\tYou qualify for the student rate which is $19.95.";
rate = STUDENT_RATE;
}
else if (age < 50)
{
cout << "\n\n\t\tYou qualify for the regular rate at $45.95.";
rate = REGULAR_RATE;
}
else
{
cout << "\n\n\t\tYou qualify for the AARP rate at $29.95";
rate = AARP_RATE;
}
//get the months
cout << "\n\n\t\tHow many months do you want to join? ";
cin >> months;
//validate the input
while (months < 0)
{
void month(int);
}
//calculate the bill
totalBill = months * rate;
//display the bill
system("CLS");
cout << "\n\n\n\n\n\n\t\tYour total bill is: $" << totalBill << endl << endl
<< endl << endl << endl << endl << endl;
//add to counter & accumulator
count += 1;
totalSum += totalBill;

cout << "\n\n\t\tRun the program again? (Y/N) ";
cin >> option;
} while (option == 'y' || option == 'Y');
//display farewell and summary
system("CLS");
void exit();
return EXIT_SUCCESS;
}
void welcome()
{
cout << "\n\n\n\n\n\n"
<< "\n\t\t\t**************************************"
<< "\n\t\t\t* *"
<< "\n\t\t\t* Welcome to the C++ Health Club! *"
<< "\n\t\t\t* Our job is to help you work both *"
<< "\n\t\t\t* body and mind. *"
<< "\n\t\t\t* *"
<< "\n\t\t\t**************************************"
<< "\n\n\n\n\n\n\n\n\n\n\n";
system("PAUSE");
}
void exit(int count, double totalSum)
{
cout << "\n\n\n\n\n\n"
<< "\n\t\t*********************************************"
<< "\n\t\t* "
<< "\n\t\t* Thank you for visitng C++ Health Club! "
<< "\n\t\t* We hope you enjoyed your stay. "
<< "\n\t\t* "
<< "\n\t\t* " << count << " people(s) used this program"
<< "\n\t\t* $" << totalSum << " was spent. "
<< "\n\t\t* "
<< "\n\t\t*********************************************"
<< "\n\n\n\n\n\n\n\n\n\n\n";
system("PAUSE");
}
void month(int months)
{
cout << "\n\n\t\tInvalid! Enter a positive number.";
cout << "\n\n\t\tHow many months do you want to join? ";
cin >> months;
}
void ages(int age)
{
cout << "\n\n\n\n\t\t\tAARP Rate (50 or more years)"
<< "\n\n\t\t\tStudent Rate (18 or less years)"
<< "\n\n\t\t\tRegular Rate (everyone else)"
<< "\n\n\n\n\t\t\tHow old are you? ";

//get the age
cin >> age;
}

miken5678

is it indeed possible to replace the whole if else if statements with one function?

techsoul

yes it is possible. You need to pass "age" as a const parameter and "rate" as a reference parameter to the function. And cut paste all the if>else if>else statements in that function. OR you can also make "rate" as a global parameter (declare it outside main) and pass only "age" to the function. The function will not return anything. Therefore, it will be a VOID function.

void findRate (const int age1, int& rate1)
{
// if>else if>else statements
// don't forget to rename rate to rate1 in the function defination.
}

OR
void findRate(const int age)
{
// if>else if>else statements
}


calling the function will look like this


findRate(age, rate);

OR

findRate(age);



good luck

Deckard

Ugh. I would avoid changing global variables in a function. In fact, you don't even need global variables to do this.

A function takes input and produces output. Reading your summary, you could have something like this:

void welcome(void);
void printError(char *error);
unsigned int getAge(void);
unsigned int getMonths(void);
unsigned double calculateTotal(unsigned int age, unsigned int months);

Why not do the validation/verification in the functions themselves? That is to say, in the getAge() function,

calculateTotal() would be something like:
Then your main() loop would be something like:

See how clear and concise it is?

miken5678

on to next question.. this is my final program for the class.. i have most of it down but.. there is a question

for options b&c call a function that displays " you selected option 'B'. or ......

this function should accept a parameter indication which character was selected