Simple Interest Calculation in C++

This document provides a C++ program to calculate simple interest. The program is well-structured and includes documentation for better understanding.

Program Explanation

The program calculates simple interest using the formula:

Simple Interest (SI) = (Principal * Rate * Time) / 100

Where:

• Principal (P): The initial amount of money.
• Rate (R): The annual interest rate (in percentage).
• Time (T): The time period in years.

C++ Program

#include <iostream>
using namespace std;

/**
 * Function to calculate simple interest
 * @param principal The principal amount
 * @param rate The annual interest rate (in percentage)
 * @param time The time period in years
 * @return The calculated simple interest
 */
double calculateSimpleInterest(double principal, double rate, double time) {
    return (principal * rate * time) / 100;
}

int main() {
    double principal, rate, time, simpleInterest;

    // Input principal, rate and time from user
    cout << "Enter the principal amount: ";
    cin >> principal;
    cout << "Enter the annual interest rate (in percentage): ";
    cin >> rate;
    cout << "Enter the time period in years: ";
    cin >> time;

    // Calculate simple interest
    simpleInterest = calculateSimpleInterest(principal, rate, time);

    // Output the result
    cout << "The simple interest is: " << simpleInterest << endl;

    return 0;
}

Explanation of the Code

The program consists of a main function and a helper function calculateSimpleInterest.

Function calculateSimpleInterest

This function takes three parameters:

• principal: The principal amount.
• rate: The annual interest rate (in percentage).
• time: The time period in years.

It calculates the simple interest using the formula mentioned above and returns the result.

Function main

The main function performs the following steps:

• Declares variables to store the principal, rate, time, and calculated simple interest.
• Prompts the user to input the principal amount, annual interest rate, and time period.
• Calls the calculateSimpleInterest function with the user inputs and stores the result in simpleInterest.
• Outputs the calculated simple interest.

Conclusion

This C++ program effectively calculates simple interest based on user input. The program structure and documentation make it easy to understand and maintain.