Solution Source Code

Code Overview

1. Header Files and Namespace:

• <iostream> is included for input and output operations.
• <string> is included for potential future use (not used in this program).
• <cmath> is included to use sqrt() and pow() for mathematical calculations.
• using namespace std; allows the use of standard functions without prefixing them with std::.

2. User Input Function (ReadNumbers)

• Uses reference parameters (float &A, float &D) to modify the values directly.
• Prompts the user to enter one side (A) and the diagonal (D) of a rectangle.

3. Area Calculation Function (RectangleAreaBySideAndDiagonal)

• Takes the side (A) and diagonal (D) as input.
• Uses the formula: Area=A×D2−A2\text{Area} = A \times \sqrt{D^2 - A^2}Area=A×D2−A2​ This formula derives the missing side using the Pythagorean theorem and calculates the rectangle's area.
• Returns the computed area.

4. Output Function (PrintResult)

• Receives the computed area as a parameter.
• Prints "Rectangle Area = [Area]".

5. Program Execution (main())

• Declares two float variables (A, D) to store side and diagonal.
• Calls ReadNumbers() to get user input.
• Calls RectangleAreaBySideAndDiagonal() to compute the area.
• Calls PrintResult() to display the result.
• Returns 0 to indicate successful execution.

This structured explanation ensures clarity and ease of understanding.