Question

Mod Operator needs to be added? Help fixing C++ program using doubles

Asked by: nuclearwerewolf

This question was asked previously but, to no avail.
I am using code blocks as my compiler.

I have a program that I am trying to figure out.
The instructions given is:
Write a C++ program will take in the price of an item purchased and  the amount of cash tendered. The program will output the amount of change and then break this down
into dollars, quarters, dimes, nickels and pennies.Use the modulus operator. You may be off by one penny, but see if
you can find a way to fix that by writing code to perform rounding.  When you assign a double to an int, the decimal
portion is truncated.

Example run:

Enter the price of the item:   3.35

Enter the amount of cash tendered: 5.00

Your change is $1.65

1 dollar
2 quarters
1 dimes
1 nickel
0 pennies

Please help me figure out how to implement the mod operator and get the correct change.

I asked this question previously and the expert didn't give answer using double.

**************
**************
 
Original Code:
#include <iostream>
 
using namespace std;
 
int main()
{
    double itemPrice;
    double cashTendered;
    double change;
    int dollars ;
    int quarters ;
    int dimes ;
 
    cout << " What was the price of the item purchased ?" ;
    cin >> itemPrice;
 
    cout << " How much did you hand the cashier ?" ;
    cin >> cashTendered;
 
    change = cashTendered - itemPrice;
    dollars = change ;
    quarters = (change - dollars) / .25;
    dimes = (change - dollars) / .10 ;
 
 
 
 
    cout << " Your change should be :$" << change << endl ;
    cout << dollars << "Dollar(s)" << endl;
    cout << quarters << "Quarter(s)" << endl;
    cout << dimes << " Dime(s)" << endl ;
 
    return 0;
}
 
 
************
************
Expert Code (not compilable and without doubles):
 float itemPrice;
    float cashTendered;
    float change;
    int dollars ;
    int quarters ;
    int dimes ;
      int nickels;
      int pennies;
      int temp;
      dollars = quarters = dimes = nickels = pennies = 0;
 
    cout << " What was the price of the item purchased ?" ;
    cin >> itemPrice;
 
    cout << " How much did you hand the cashier ?" ;
    cin >> cashTendered;
 
   /* change = cashTendered - itemPrice;
    dollars = change ;
 
      temp = change-dollars;
    quarters = (change - dollars) / 0.25;
   
      dimes = (temp - quarters*0.25) / 0.10 ;
    
      temp = temp - (dimes*0.10)- (quarters*0.25);
      
    nickels = temp/0.05;
 
      temp = temp - (nickels*0.05) ;
 
    pennies = temp/0.01;*/
 
    change = cashTendered - itemPrice;
    dollars = change ;
    temp = (change-dollars)*100;
    //temp = temp*100;
    quarters = (temp - (temp % 25 ))/25;
      temp = temp - (25 * quarters);
    dimes = (temp - (temp % 10))/10;
    temp = temp - (10 * dimes);
      nickels = (temp - (temp % 5))/5;
      pennies = temp - (5 * nickels);
 
 
 
 
 
    cout << " Your change should be :$" << change << endl ;
    cout << dollars << " Dollar(s)" << endl;
    cout << quarters << " Quarter(s)" << endl;
    cout << dimes << " Dime(s)" << endl ;
    cout << nickels << " nickel(s)" << endl ;
    cout << pennies << " pennie(s)" << endl ;

                                  
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Asked On
2009-09-19 at 00:12:43ID24745232
Tags

Mod Operator help

,

Fix c++ program

,

Doubles

Topics

C++ Programming Language

,

C Programming Language

,

Microsoft Visual C++

Participating Experts
2
Points
500
Comments
18

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Answers

 

by: _phoenix_Posted on 2009-09-19 at 00:15:20ID: 25371856

Try this my friend :) before giving points.

#include <stdio.h>
 
int main (void) 
{
    double itemPrice;
    double cashTendered;
    double change;
    long dollars ;
    long quarters ;
    long cents ;
	
	printf("What Was The Price Of The Purchased Item? : ");
	scanf("%lf",&itemPrice);
	
	printf("How Much Did You Hand The Cashier? : ");
	scanf("%lf",&cashTendered);
		
	change = cashTendered - itemPrice;
	dollars = (long) (change);
	quarters = (long)(change * 4) % (dollars * 4);
	cents = ((long)(change * 100) % (dollars * 100)) - (quarters * 25);		
 
	printf("Your Change Should Be : %.2f\n", change);
	printf("Dollars %ld\n", dollars);
	printf("Quarters %ld\n",quarters);
	printf("Dimes %ld\n", cents);
		
	getchar();
	
	return (0);
}
                                              
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by: _phoenix_Posted on 2009-09-19 at 00:16:03ID: 25371859

Also, this is not C++ but ANSI C, hope it helps

 

by: nuclearwerewolfPosted on 2009-09-19 at 00:20:24ID: 25371872

The results is not showing correctly.
Using the numbers above,

1st question:
I've input 3.35

2nd question:
i've input 5.00

the result:
Dollars: 1
Quarters: 2
Dimes: 14
No Nickels
No Pennies

The results I need is:
Dollars: 1
Quarters: 2
Dimes: 1
Nickels: 1
Pennies: 0

 

by: nuclearwerewolfPosted on 2009-09-19 at 00:21:04ID: 25371877

I need C++ only.

 

by: _phoenix_Posted on 2009-09-19 at 00:29:59ID: 25371905

Ok,

5.00 - 3.35 = 1.65

Dollars = 1
Quarters = 2
Cents = 15

Doing some math, you have 65 cents if I am right. So, 2 Quarters are 50 cents plus the remaining 15 cents equals .65 which is the decimal part that you have.

If you need C++ only, then change the printf and scanf functions I used and change them for cin and cout you had previously.

 

by: nuclearwerewolfPosted on 2009-09-19 at 00:33:08ID: 25371914

Okay, I will do that but I requested in the format of
Dollars: 1
Quarters: 2
Dimes: 1
Nickels: 1
Pennies: 0

1 dime + 1 nickel = 15 cents and zero pennies
or 15 pennies

 

by: _phoenix_Posted on 2009-09-19 at 00:35:00ID: 25371919

Ok... I guess this is not homework right?

 

by: nuclearwerewolfPosted on 2009-09-19 at 00:39:25ID: 25371930

Actually no. This was a given example of C++ found on the internet but, I had no answer. I am trying to learn C++ and am trying to keep to the exact guidelines.

 

by: nuclearwerewolfPosted on 2009-09-19 at 00:47:58ID: 25371955

Any more suggestions? Anyone?

 

by: _phoenix_Posted on 2009-09-19 at 00:52:13ID: 25371972

I´m trying to help, actually the % operator is not C++. I´ll continue posting the operations here for the rest of the values.

 

by: _phoenix_Posted on 2009-09-19 at 00:58:52ID: 25371987

But right now it´s 3.00 a.m here... so it will need to wait until tomorrow.

 

by: nuclearwerewolfPosted on 2009-09-19 at 01:01:02ID: 25371993

Okay, that's cool. Thank you!

To help, I have found other code that may be helpful but it doesn't use just the iostream
header library. It also uses another.
#include <iostream>
#include <cmath>
using namespace std;
 
int main ()
{
 
// State  Variables.
int dollars ;
int quarters ;
int dimes ;
int nickels ;
int pennies ;
double itemPrice ;
double cashTendered ;


// State the price of the item.
cout << "What was the price of the item purchased?" ;
cin >> itemPrice ;

// Get the money recieved from the person.
cout << "How much did you hand the cashier?" ;
cin >> cashTendered

// Conversion from cash to pennies.
pennies = ceil(((cashTendered - itemPrice)*100)) ;

 
// Dollars if needed (if any).
dollars = pennies / 100 ;

// Find how many pennies remain.
pennies = pennies % 100 ;


// Quarters if needed (if any).
quarters = pennies / 25;

// Find how many pennies remain.
pennies = pennies % 25;

// Dimes if needed (if any).
dimes = pennies / 10;

// Find how many pennies remain.
pennies = pennies % 10;

// Nickels if needed (if any).
nickels = pennies / 5;

// Find how many pennies remain.
pennies = pennies % 5;

// Result Output
cout << "Your change back is " << (cashTendered - itemPrice) << endl;
cout << dollars << " dollars" << endl;
cout << quarters << " quarters" << endl;
cout << dimes << " dimes" << endl;
cout << nickels << " nickels" << endl;
cout << pennies << " pennies" << endl;
}


This does not compile correctly though giving an error
C:\Documents and Settings\Seth\Desktop\main (nuke).cpp|27|error: expected `;' before "pennies"|

I am not sure.

 

by: nuclearwerewolfPosted on 2009-09-19 at 01:16:31ID: 25372030

I figured my last question out. Still am not sure of just using the header iostream

 

by: TheCatcherPosted on 2009-09-19 at 01:23:03ID: 25372049

The ceil function is why the cmath headeris needed.

pennies = ceil(((cashTendered - itemPrice)*100)) ;

For what you are doing, you should be able to change the line to this

pennies = (cashTendered - itemPrice)*100 ;

And remove the cmath header line.

 

by: nuclearwerewolfPosted on 2009-09-19 at 01:36:38ID: 25372081

I will try that catcher, thanks!

 

by: nuclearwerewolfPosted on 2009-09-19 at 02:18:05ID: 25372185

I am going to split points. Both have assisted me but, TheCatcher actually got it dead on.
This actually works, I have tested it numerous times.

 

by: nuclearwerewolfPosted on 2009-09-19 at 02:20:50ID: 25372193

Final Code (I realize that the number is off 1, but that's due to scenario). The code above works perfectly (that I pasted, just put a semicolon after cashTendered).

::::::::::

#include <iostream>

using namespace std;
 
int main ()
{
 
// State  Variables.
int dollars ;
int quarters ;
int dimes ;
int nickels ;
int pennies ;
double itemPrice ;
double cashTendered ;


// State the price of the item.
cout << "What was the price of the item purchased?" ;
cin >> itemPrice ;

// Get the money recieved from the person.
cout << "How much did you hand the cashier?" ;
cin >> cashTendered ;

// Conversion from cash to pennies.
pennies = (cashTendered - itemPrice)*100 ; ;

 
// Dollars if needed (if any).
dollars = pennies / 100 ;

// Find how many pennies remain.
pennies = pennies % 100 ;


// Quarters if needed (if any).
quarters = pennies / 25;

// Find how many pennies remain.
pennies = pennies % 25;

// Dimes if needed (if any).
dimes = pennies / 10;

// Find how many pennies remain.
pennies = pennies % 10;

// Nickels if needed (if any).
nickels = pennies / 5;

// Find how many pennies remain.
pennies = pennies % 5;

// Result Output
cout << "Your change back is " << (cashTendered - itemPrice) << endl;
cout << dollars << " dollars" << endl;
cout << quarters << " quarters" << endl;
cout << dimes << " dimes" << endl;
cout << nickels << " nickels" << endl;
cout << pennies << " pennies" << endl;
}

 

by: nuclearwerewolfPosted on 2009-09-19 at 02:23:11ID: 31630898

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