# C++ program to calculate the simple interest using class

Learn, how can we find the calculate simple interest using the class and object approach?
Submitted by Shubh Pachori, on September 04, 2022

## Problem statement

Given the principle, rate, and interest, find the simple interest using class and object approach in C++.

Example:

```Input:
Enter Principle: 1000
Enter Rate: 2
Enter Time: 1

Output:
Simple Interest: 20
Total Amount: 1020
```

## C++ code to calculate the simple interest using the class and object approach

```#include <iostream>
using namespace std;

// create a class
class SimpleInterest {
// private data members
private:
float principle, rate, time_period;

// public member functions
public:
// putValues() function to insert values like
// principle, rate and time
void putValues() {
cout << "Enter Principle: ";
cin >> principle;

cout << "Enter Rate: ";
cin >> rate;

cout << "Enter Time: ";
cin >> time_period;
}

// getSimpleInterest() function to calculate
// Simple Interest and Total Amount
void getSimpleInterest() {
// initializing float type variables
// to perform operations
float interest, amount;

// calculating simple interest
interest = (principle * rate * time_period) / 100;

// calculating Total Amount
amount = interest + principle;

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

cout << "Total Amount: " << amount << endl;
}
};

int main() {
// create object
SimpleInterest S;

// calling putValues() function
// to insert values
S.putValues();

// calling getSimpleInterest() function to
// calculating simple interest
S.getSimpleInterest();

return 0;
}
```

### Output

```Enter Principle: 12000
Enter Rate: 12
Enter Time: 2
Simple Interest: 2880
Total Amount: 14880
```

### Explanation

In the above code, we have created a class SimpleInterest, three float type data members principle, rate and time_period to store the values like principle, rate and time, and public member functions putValues() and getSimpleInterest() to store values and to calculate simple interest and total amount.

In the main() function, we are creating an object S of class SimpleInterest, reading the values inputted by the user using putValues() function, and finally calling the getSimpleInterest() member function to calculate the simple interest and total amount. The getSimpleInterest() function contains the logic to calculate the simple interest and total amount and printing the result.