Program to find compound interest

Try it on GfG Practice

What is 'Compound interest' ? 
Compound interest is the addition of interest to the principal sum of a loan or deposit, or in other words, interest on interest. It is the result of reinvesting interest, rather than paying it out, so that interest in the next period is then earned on the principal sum plus previously-accumulated interest. Compound interest is standard in finance and economics.
Compound interest may be contrasted with simple interest, where interest is not added to the principal, so there is no compounding.
Compound Interest formula: 
 

Formula: to calculate compound interest annually is given by: 
Amount= P(1 + R/100)^t

Compound Interest = Amount - P
Where, 
P is the principal amount 
R is the rate and 
T is the time span

Pseudo Code: 

Input principal amount. Store it in some variable say principal
Input time in some variable say time.
Input rate in some variable say rate.
Calculate Amount using the formula, 
Amount = principal* (1 + rate / 100)  ^time).
Calculate Compound Interest using Formula.
Finally, print the resultant value of CI.

Example: 

Input: Principal (amount): 1200, Time: 2, Rate: 5.4
Output: Compound Interest = 133.099243

// CPP program to find compound interest for
// given values.
#include <bits/stdc++.h>
using namespace std;

int main()
{
    double principal = 10000, rate = 5, time = 2;

    /* Calculate compound interest */
    double A = principal * (pow((1 + rate / 100), time));
      double CI = A- principal;

    cout << "Compound interest is " << CI;

    return 0;
}
//This Code is Contributed by Sahil Rai.

// C program to calculate Compound Interest
#include <stdio.h>
#include<math.h> // for using pow function we must include math.h

int main() {
  double principal = 10000; // principal amount
  double rate = 5; //annual rate of interest
  double time = 2; // time

  // Calculating compound Interest
    double Amount = principal * (pow((1 + rate / 100), time));
    double CI = Amount - principal;
 
    printf("Compound Interest is : %lf",CI);
    return 0;
}

// Java program to find compound interest for
// given values.
import java.io.*;

class GFG
{
    public static void main(String args[])
    {
        double principal = 10000, rate = 5, time = 2;

        /* Calculate compound interest */
        double A = principal *
                    (Math.pow((1 + rate / 100), time));
          double CI = A - principle;
        
        System.out.println("Compound Interest is "+ CI);
    }
}

//This Code is Contributed by Sahil Rai.

# Python3 program to find compound
# interest for given values.

def compound_interest(principal, rate, time):

    # Calculates compound interest 
    A = principal * (pow((1 + rate / 100), time))
    CI= A - principal
    print("Compound interest is", CI)


compound_interest(10000, 5, 2)

#This Code is Contributed by Sahil Rai.

// C# program to find compound 
// interest for given values
using System;

class GFG {

    // Driver Code
    public static void Main()
    {
        double principal = 10000, rate = 5, time = 2;

        // Calculate compound interest 
        double A = principal * (Math.Pow((1 +
                    rate / 100), time));
          double CI = A - principal;
        
        Console.Write("Compound Interest is "+ CI);
    }
}

//This Code is Contributed by Sahil Rai.

<script>

// JavaScript program to 
// find compound interest for
// given values.

    let principal = 10000, rate = 5, 
        time = 2;

    /* Calculate compound interest */
    let A = principal * 
        (Math.pow((1 + rate / 100), time));
    let CI = A - principal;

    document.write("Compound interest is " + CI);
</script>

// This Code is Contributed by Sahil Rai.

<?php
// PHP program to find 
// compound interest for
// given values.

$principal = 10000;
$rate = 5; 
$time = 2;

// Calculate compound interest
$A = $principal * (pow((1 + 
      $rate / 100), $time));
$CI = $A - $principal;

echo("Compound interest is " . $CI);

?>

Output: 

Compound interest is 1025

Time complexity: O(1), as there is no loop used so constant time
Auxiliary Space: O(1)