Terminal 1 Input: 100 30 50 7 9.7Terminal 2 input: 255.6 31 55 3 12.3 **Summary**Interest on a credit card’s unpaid balance is calculated using the average daily balance.Suppose that `netBalance` is the balance shown in the bill, `payment` is the payment made, `d1` is the number of days in the billing cycle, and `d2` is the number of days payment is made before billing cycle.Then, the average daily balance is:\[ \text{averageDailyBalance} = \left(\frac{\text{netBalance} \times \text{d1} - \text{payment} \times \text{d2}}{\text{d1}}\right) \]If the interest rate per month is, say, 0.0152, then the interest on the unpaid balance is:\[ \text{interest} = \text{averageDailyBalance} \times 0.0152 \]**Instructions**Write a program that accepts as input `netBalance`, `d1`, `payment`, `d2`, and interest rate per month (`interestRate`).

C++ program to the given problem is: #include <iostream>#include <iomanip> using…

Answered: Summary Interest on a credit card's…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

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Terminal 1 Input: 100 30 50 7 9.7

Terminal 2 input: 255.6 31 55 3 12.3

**Summary**

Interest on a credit card’s unpaid balance is calculated using the average daily balance.

Suppose that `netBalance` is the balance shown in the bill, `payment` is the payment made, `d1` is the number of days in the billing cycle, and `d2` is the number of days payment is made before billing cycle.

Then, the average daily balance is:

\[ \text{averageDailyBalance} = \left(\frac{\text{netBalance} \times \text{d1} - \text{payment} \times \text{d2}}{\text{d1}}\right) \]

If the interest rate per month is, say, 0.0152, then the interest on the unpaid balance is:

\[ \text{interest} = \text{averageDailyBalance} \times 0.0152 \]

**Instructions**

Write a program that accepts as input `netBalance`, `d1`, `payment`, `d2`, and interest rate per month (`interestRate`).

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Follow-up Question

Everything in my terminal before "Enter net balance: 0.00" showed up on its own when I ran the program. I changed the formula to averageDailyBalance = (netBalance * d1 - payment * d2)/d1; and something I still incorrect. I sent over what I have on each side if you could help look over this

```cpp
#include <iostream>
#include <iomanip>

using namespace std;

int main() {
double netBalance, d1, payment, interest, d2, interestRate, averageDailyBalance;

cout << setprecision(2) << fixed << showpoint;
cout << "Enter net balance: ";
cin >> netBalance;
cout << "Enter number of days in the billing cycle: ";
cin >> d1;
cout << "Enter payment made: ";
cin >> payment;
cout << "Enter number of days payment is made before billing cycle: ";
cin >> d2;
cout << "Enter the interest rate: ";
cin >> interestRate;

averageDailyBalance = (netBalance * d1 - payment * d2) / d1;
interest = averageDailyBalance * interestRate;

cout << endl << "Interest is: " << interest << endl;

return 0;
}
```

In this C++ program, a user is prompted to input several financial figures to calculate the interest on an average daily balance. The program takes into account the net balance, days in the billing cycle, the payment amount, and the number of days the payment is made before the billing cycle, as well as the interest rate. The result is the interest calculated based on these inputs, formatted to two decimal places for clarity.

### Terminal Session Transcription

Below is the transcription of a terminal session used to compile and run a C++ program that calculates interest based on user input.

1. **File Removal:**
```bash
sandbox $ rm -f a.out
```

2. **Compilation:**
```bash
sandbox $ g++ -Wall -std=c++0x main.cpp
```
- **Warning:**
```
main.cpp:22:34: warning: ‘interestRate’ may be used uninitialized in this function [-Wmaybe-uninitialized]
```

3. **Running the Program:**
```bash
sandbox $ ./a.out
```

4. **User Inputs and Execution:**
- Enter net balance: `100`
- Enter number of days in the billing cycle: `30`
- Enter payment made: `50`
- Enter number of days payment is made before billing cycle: `7`
- Enter the interest rate: `9.7`

5. **Output:**
- Interest is: `0.00`

### Explanation

- **Program Context:** The executed C++ program is aimed at calculating the interest based on several parameters: net balance, billing cycle duration, payment amounts and timings, and interest rate.

- **Warning Insight:** The compiler warning indicates a potential issue where the variable `interestRate` might not be initialized before use. This could lead to unexpected results or a need for debugging in the code file `main.cpp`.

- **Output Details:** The calculated interest output is `0.00`, which suggests either the calculations result in no interest due or there may be an error due to the uninitialized interest rate warning.

### Additional Notes

- **Development Considerations:** Ensure all variables, especially those critical to calculations (like `interestRate`), are properly initialized to avoid runtime errors or warnings.

- **User Prompt Design:** The program prompts for input sequentially, ensuring the user knows exactly what information is needed for interest calculation.

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Follow-up Question

My interest results keeps coming out to 0.00? Not sure what I'm doing wrong

Below is the transcription of the text from the image, which appears to be a C++ program along with a terminal output demonstrating its execution:

### C++ Program (main.cpp)

```cpp
#include <iostream>
#include <iomanip>

using namespace std;

int main() {
double netBalance, d1, payment, interest, d2, interestRate, averageDailyBalance;

cout << setprecision(2) << fixed << showpoint;
cout << "Enter net balance: ";
cin >> netBalance;
cout << "Enter number of days in the billing cycle: ";
cin >> d1;
cout << "Enter payment made: ";
cin >> payment;
cout << "Enter number of days payment is made before billing cycle: ";
cin >> d2;
cout << "Enter the interest rate: ";
cin >> interest;

averageDailyBalance = (netBalance * d1 - payment * d2) / d1;
interest = averageDailyBalance * interestRate;

cout << endl << "Interest is: " << interest << endl;
return 0;
}
```

### Terminal Output

```plaintext
sandbox $ rm -f a.out
sandbox $ g++ -Wall -std=c++0x main.cpp
main.cpp: In function 'int main()':
main.cpp:22:34: warning: 'interestRate' may be used uninitialized in this function [-Wmaybe-uninitialized]
interest = averageDailyBalance * interestRate;
^

sandbox $ ./a.out
Enter net balance: 100
Enter number of days in the billing cycle: 30
Enter payment made: 50
Enter number of days payment is made before billing cycle: 7
Enter the interest rate: 9.7
Interest is: 0.00
sandbox $
```

### Explanation

1. **C++ Program**: The program is designed to calculate the interest based on user inputs such as net balance, number of days in the billing cycle, payment made, and interest rate. It uses the formula for average daily balance.

2. **Code Issues**: The program gives a warning about the `interestRate` variable possibly being uninitialized, which will result in incorrect interest calculation. The variable `interestRate` should be initialized with the value entered by the user.

3. **Output**: The terminal shows the interaction with the program, where the user inputs

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Follow-up Question

My interest keeps coming out to 0.00. Not sure what I keep doing wrong

8
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main.cpp
go
1 #include <iostream>
2 #include <iomanip>
3
4 using namespace std;
5
Ⓒ
6 int main() {
7
double netBalance, d1, payment, interest, d2, interest Rate, average DailyBalance
8
10
11
O
9
+
12
13
14
15
16
17
18
cout << setprecision(2) << fixed << showpoint;
cout << "Enter net balance:
cin >> netBalance;
cout << "Enter number of days in the billing cycle: ";
cin >> dl;
cout << "Enter payment made:
cin >> payment;
cout << "Enter number of days payment is made before billing cycle: ";
cin >> d2;
cout << "Enter the interest rate: ";
cin >> interest;
20
21 averageDailyBalance = (netBalance * d1* d2 - payment)/dl;
22 interest = averageDailyBalance * interestRate;
23
24
25 return 0;
26}
cout<<endl<<"Interest is: "<< interest << endl;
0
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hp
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>_ Terminal
sandbox $ rm -f a.out
р
X +
sandbox $
sandbox $
sandbox $ g++ -Wall -std=c++0x main.cp
main.cpp: In function 'int main()':
main.cpp:22:34: warning: 'interestRate
may be used uninitialized in this fu
nction [-Wmaybe-uninitialized]
eDailyBalance * interestRate;
sandbox $ ./a.out
Enter net balance: 100
Enter number of days in the billing cy
cle: 30
Enter payment made: 50
Enter number of days payment is made b
efore billing cycle: 7
Enter the interest rate: 9.7
Interest is: 0.00
sandbox $
X
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6:54 P
10/22/202

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