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Programming Methodology

Calculate Tax Based on Salary Input in C++

This C++ exercise involves calculating the tax to be paid based on a user's salary. The program prompts the user to enter their salary and then applies a set of tax rules to determine how much tax they need to pay. This type of logic is common in real-world applications such as payroll systems or financial software.

In this example, the tax rates are structured in tiers:
- Salaries up to $10,000 have no tax.
- Salaries from $10,001 to $20,000 are taxed at 10%.
- Salaries from $20,001 to $40,000 are taxed at 20%.
- Salaries above $40,000 are taxed at 30%.

This exercise reinforces the use of conditional statements and arithmetic operations to implement a practical financial rule set.

Group

Advanced Conditional Structures in C++

Objective

1. Ask the user to input their salary as a floating-point number.
2. Apply a set of conditional tax rules based on the salary range.
3. Calculate and display the amount of tax owed.

Implement a program that calculates the tax payable based on salary.

Example C++ Exercise

 Copy C++ Code 
#include <iostream>  // Include the input/output library

using namespace std;

int main() {
    // Declare a variable to store the salary
    float salary;
    // Declare a variable to store the tax to be paid
    float tax = 0.0;

    // Prompt the user to enter their salary
    cout << "Enter your salary: ";
    cin >> salary;

    // Apply tax rules based on salary range
    if (salary <= 10000) {
        // No tax for salaries up to $10,000
        tax = 0;
    } else if (salary <= 20000) {
        // 10% tax for salaries between $10,001 and $20,000
        tax = (salary - 10000) * 0.10;
    } else if (salary <= 40000) {
        // 10% for the first $10,000 after $10,000, and 20% for the rest
        tax = (10000 * 0.10) + (salary - 20000) * 0.20;
    } else {
        // 10% for $10,000, 20% for $20,000, and 30% for the amount above $40,000
        tax = (10000 * 0.10) + (20000 * 0.20) + (salary - 40000) * 0.30;
    }

    // Display the calculated tax
    cout << "The tax to be paid is: $" << tax << endl;

    return 0;  // End of program
}

 Output

Enter your salary: 45000
The tax to be paid is: $7000

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