Problem 14 - C++ How to Program

Question

Perform each of these steps: a. Read the problem statement. b. Formulate the algorithm using pseudocode and top-down, stepwise refinement. c. Write a \(C++\) program. d. Test, debug and execute the \(C++\) program. Develop a \(C++\) program that will determine whether a department-store customer has exceeded the credit limit on a charge account. For each customer, the following facts are available: a. Account number (an integer) b. Balance at the beginning of the month c. Total of all items charged by this customer this month d. Total of all credits applied to this customer's account this month e. Allowed credit limit The program should use a while statement to input each of these facts. calculate the new balance \((=\text { beginning balance }+\) charges credits) and determine whether the new balance exceeds the customer's credit limit. For those customers whose credit limit is exceeded, the program should display the customer's account number, credit limit, new balance and the message "Credit limit Exceeded.

Step-by-Step Solution

Answer

The C++ program calculates a new balance and checks if it exceeds the credit limit, outputting details if so.

Step 1: Understand the Problem

The problem is asking for a C++ program that reads customer account details, calculates the new balance by adding charges to and subtracting credits from the beginning balance, and checks if the new balance exceeds the given credit limit. If the credit limit is exceeded, the program should output relevant information.

Step 2: Develop the Algorithm

Start by writing a pseudocode that details the process:1. Initialize required variables: account number, beginning balance, total charges, total credits, credit limit.2. Use a loop to continuously read input for these variables.3. Calculate the new balance: \[ \text{New Balance} = \text{Beginning Balance} + \text{Total Charges} - \text{Total Credits} \]4. If the new balance is greater than the credit limit, output the account number, credit limit, new balance, and the message "Credit limit Exceeded." Otherwise, proceed to the next customer. Repeat until there are no more customers.

Step 3: Write the C++ Program

Translate the pseudocode into C++ syntax. Here's a possible implementation: ```cpp #include using namespace std; int main() { int accountNumber; double beginningBalance, totalCharges, totalCredits, creditLimit; double newBalance; // Use a loop to input customer data while (true) { cout << "Enter account number (or -1 to quit): "; cin >> accountNumber; if (accountNumber == -1) break; cout << "Enter beginning balance: "; cin >> beginningBalance; cout << "Enter total charges: "; cin >> totalCharges; cout << "Enter total credits: "; cin >> totalCredits; cout << "Enter credit limit: "; cin >> creditLimit; // Calculate new balance newBalance = beginningBalance + totalCharges - totalCredits; // Check if credit limit is exceeded if (newBalance > creditLimit) { cout << "Account number: " << accountNumber << endl; cout << "Credit limit: " << creditLimit << endl; cout << "New balance: " << newBalance << endl; cout << "Credit limit Exceeded." << endl; } } return 0; } ```

Step 4: Test the Program

Run the C++ program with various input values to ensure it correctly calculates the new balance and identifies when the credit limit is exceeded. Debug any errors by reviewing the logic and syntax based on test outcomes.

Key Concepts

Understanding Pseudocode in C++ Programming

Pseudocode is a simple way to articulate algorithms in plain language, making it a great tool for planning programming tasks in C++. It bridges the gap between the problem statement and the actual code, laying out the steps clearly before any coding begins. For this exercise, the pseudocode began by initializing variables such as account numbers, beginning balance, total charges, total credits, and credit limits. This structured approach helps programmers understand the logical flow and sequence of operations without getting bogged down by syntax. By using pseudocode, you can easily identify potential logical flaws in your plan and correct them early in the development process. This simplicity makes pseudocode an indispensable part of C++ programming, especially when dealing with complex calculations or multiple user inputs.

Mastering Loop Structures for Efficient Coding

Loop structures are essential in programming as they allow you to perform repetitive tasks efficiently. In this exercise, the while loop is used to continuously read customer data until a termination condition is met, indicating the end of data input when the user enters `-1` for the account number. This demonstrates the power of loop structures in handling multiple entries in a compact form. Using while loops reduces code redundancy by eliminating the need for writing separate statements for each iteration. In C++, loops like 'while', 'for', and 'do-while' help in executing repeated actions, thus making programs concise and manageable. Understanding how and when to use different loop structures is key to efficient programming and problem-solving in C++.

Understanding Credit Calculations in Programming Context

Credit calculations form a significant part of this credit limit checking program. The main purpose here is to compute a customer's new balance by considering the beginning balance, total charges made, and any credits applied within the month. The calculation is simple yet powerful: - Use the formula: \( \text{New Balance} = \text{Beginning Balance} + \text{Total Charges} - \text{Total Credits} \)- After calculating, the program checks if the account balance exceeds the allowed credit limit.This kind of calculation is common in financial software, where real-time calculations are necessary to manage customer accounts and detect overdrafts or breaches of limits. Understanding how these calculations work helps you build accurate financial applications in C++.

Debugging Techniques for Accurate Code

Debugging is the process of identifying and removing errors from your program to ensure it works as intended. In the C++ credit limit checker, debugging involves checking both the logic and syntax of your code. Common debugging techniques include:

• Running the program with different inputs to see if it behaves as expected.
• Using print statements to track variable values and program flow.
• Checking for incorrect variable initialization, especially in loops and conditional statements.

Debugging is crucial because even simple logic or typographical errors can lead to incorrect outcomes or program crashes. By systematically testing and reviewing the code, you can find and fix these issues, ensuring the program accurately calculates new balances and correctly flags when credit limits are exceeded.