**C++ Basic Programs**

➤ Hello World! in C++

➤ Print Number in C++

➤ Add 2 Numbers C++

➤ Arithmetic Operation

➤ Sum Avg of 3 Number

➤ Area Program in C++

➤ Simple Interest in C++

➤ Find ASCII value in C++

➤ Swap 2 Number in C++

**Flow Control Programs**

➤ Even-Odd in C++

➤ +ve, -ve, 0 in C++

➤ Vowel-Consonant

➤ Greatest of 3 no.

➤ Check Leap Year

➤ Calculator Program

➤ Reverse a Number

➤ Sum of Natural Number

➤ GCD of 2 Number

➤ LCM of 2 Number

➤ Find Power in C++

➤ Fibonacci Series in C++

➤ Palindrome Number

➤ Find Factorial in C++

➤ Factorial Using Recursion

➤ Prime Number in C++

➤ Prime Number b/w 1-N

**Array**

➤ Linear Search in C++

➤ Binary Search in C++

**Others**

➤ Introduction to C++

➤ Data Types in C++

➤ Range of Data Types

➤ Void main, main vs int main

In this post, we will write a C++ program to calculate simple interest. Simple interest is a quick and easy method of calculating the interest charge on a loan. Simple interest is determined by multiplying the daily interest rate by the principal by the number of days that elapse between payments.

The formula for simple interest is given as,

`Simple Interest = (principal amount × interest rate × time) / 100`

```
#include<iostream>
using namespace std;
int main()
{
// declare variables
float p, t, r, interest;
// take input from end-user
cout << "Enter principal amount, time and rate:";
cin >> p >> t >> r;
// calculate interest
interest = (p*t*r)/100;
// display result
cout << "Interest = " << interest << endl;
return 0;
}
```

**Output:-**

Enter principal amount, time and rate: 1000 10.5 11.9

Interest = 1249.5

Simple interest is calculated as ( principal amount * time * rate ) / 100. So, we need four variables that will store the value of the principal amount, time, rate, and interest. In this C++ program to calculate simple interest, We define four variables **p, t, r,** and **interest** which stores principal amount, time, rate, and interest respectively. Using the formula of simple interest, the value of interest is calculated.

## Program to Find Simple Interest Using Function in C++

A function is a block of code that performs a specific task. Every program must have at least one function with the name ** main**. The execution of the program always starts from main function and ends with main function. Main function can call other functions to do some special task.

```
#include<iostream>
using namespace std;
// function declaration
double calculateInterest(double p, double t, double r);
// main function
int main()
{
// declare variables
double p, t, r, interest;
// take input from end-user
cout << "Enter principal amount, time and rate:";
cin >> p >> t >> r;
// calculate interest
interest = calculateInterest(p, t, r);
// display result
cout << "Interest = " << interest << endl;
return 0;
}
// function to calculate interest value
double calculateInterest(double p, double t, double r)
{
return (p*t*r)/100;
}
```

Output:-

Enter principal amount, time and rate:10000 5 9.9

Interest = 4950

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Learn More C++ Programming Examples,

- Introduction to C++ Programming
- Data Types in C++ Programming
- Find Range of Data Types in C++
- Void main(), main() vs int main() in C++
- Hello World! Program in C++
- Addition of Two Numbers in C++
- Add Subtract Multiply Divide 2 Numbers
- Sum and Average of three numbers
- Area of Circle Triangle Rectangle in C++
- Calculate Simple Interest in C++
- C++ program to find ASCII value
- C++ program to swap two Number
- Check Even or Odd Number in C++
- Find Positive Negative Zero in C++

- Greatest of Three Numbers in C++
- Program to Check Leap Year in C++
- Simple Calculator Program in C++
- Program to Reverse a Number in C++
- Sum of Natural Numbers in C++
- C++ Program for GCD of Two Numbers
- C++ Program for LCM of Two Numbers
- Find Power of a Number in C++
- Fibonacci Series Program in C++
- Check Palindrome Number in C++
- Factorial of a Number Program in C++
- Factorial Using Recursion in C++
- Prime Number Program in C++
- Prime Number b/w 1 to N in C++

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