# C++ Program to Calculate Simple Interest

In this post, we will learn how to calculate simple interest using C++ Programming language.

Simple interest is a method of calculating the interest amount for some principal amount.

The formula for calculating simple interest is (P x R x T) / 100, where P is the principal amount, R is the rate of interest and T is the time period.

We will be using the same formula in our program to compute simple interest.

So, without further ado, let’s begin this tutorial.

Contents

## C++ Program to Calculate Simple Interest

```// C++ Program to Calculate Simple Interest
#include <iostream>
using namespace std;

int main(){
int p, t, r, SI;

cout << "Enter the principal amount: ";
cin >> p;
cout << "Enter the time period(in years): ";
cin >> t;
cout << "Enter the rate of interest: ";
cin >> r;

// Calculating simple interest
SI = (p*r*t) / 100;

// Displaying output
cout << "Simple Interest: " << SI << endl;
return 0;
}
```

Output

``````Enter the principal amount: 3000
Enter the time period(in years): 2
Enter the rate of interest: 5
Simple Interest: 300
``````

## How Does This Program Work ?

```    int p, t, r, SI;
```

In this program, we have declared some int data type variables which will store the values of amount, time, rate and interest.

```    // Asking for input
cout << "Enter the principal amount: ";
cin >> p;
cout << "Enter the time period(in years): ";
cin >> t;
cout << "Enter the rate of interest: ";
cin >> r;
```

Then, the user is asked to enter the value of principal amount, time period and rate of interest.

```    // Calculating simple interest
SI = (p*r*t) / 100;
```

We calculate the simple interest using the formula (P x R X T) / 100.

```    // Displaying output
cout << "Simple Interest: " << SI << endl;
```

Finally, the simple interest calculated above is displayed to the screen using the cout statement.

## Conclusion

I hope after going through this post, you understand how to calculate simple interest using C++ Programming language.

If you have any doubt regarding the program, feel free to contact us in the comment section. We will be delighted to help you.