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

**Simple interes**t 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.

**C++ Program to Calculate Simple Interest**

// C++ Program to Calculate Simple Interest #include <iostream> using namespace std; int main(){ int p, t, r, SI; // 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; // 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.

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