Find the compound of interest in C || C Program For Compound Interest

Find the compound of interest in C

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Introduction to Compound Interest

Before we delve into the intricacies of writing a C program for compound interest, let’s first understand what compound interest is. Compound interest is a financial concept that involves calculating interest on both the principal amount and the accumulated interest from previous periods. This results in exponential growth of an investment or debt over time.

The Power of C Programming

C programming is widely recognized for its efficiency and versatility. With its extensive range of libraries and built-in functions, C offers programmers the flexibility to develop powerful and efficient solutions. Writing a C program for compound interest allows you to leverage the capabilities of this language to create a robust application that accurately calculates compound interest.

Understanding the Problem

To begin writing the C program, let’s first outline the problem statement. We aim to calculate the compound interest accrued on a principal amount over a specific time period at a given interest rate. The formula for calculating compound interest is as follows:

Compound Interest = Principal * (1 + (Rate / 100))^Time - Principal

Here, “Principal” refers to the initial amount, “Rate” represents the interest rate, and “Time” indicates the duration of the investment or loan.

Program Design and Implementation

To successfully write the C program for compound interest, we need to break down the implementation into logical steps. Let’s examine each step in detail:

Step 1: Input the Required Values

The first step involves taking input from the user. We need to gather the principal amount, interest rate, and time period. In C programming, this can be achieved using the scanf function to prompt the user for input and store the values in respective variables.

Step 2: Calculate Compound Interest

Once we have gathered the required values, we can proceed to calculate the compound interest. By utilizing the provided formula, we can compute the interest and store it in a variable.

Step 3: Display the Result

Finally, we display the calculated compound interest to the user. This can be accomplished by using the printf function to output the result on the screen.

Sample Code

Find the compound of interest in C

Example 1

int main()
    double p,r,n,ci,a;
    printf("Enter a  Principal ,Rate of Interest and Time(y)");
    scanf("%lf %lf %lf",&p,&r,&n);
    a=pow (1+r/100,n)*p;

    printf("Compound of interest is %.3lf",ci);


Example 2

#include <stdio.h>
#include <math.h>

int main() {
    float principal, rate, time, compoundInterest;

    // Step 1: Input the Required Values
    printf("Enter the principal amount: ");
    scanf("%f", &principal);

    printf("Enter the interest rate: ");
    scanf("%f", &rate);

    printf("Enter the time period (in years): ");
    scanf("%f", &time);

    // Step 2: Calculate Compound Interest
    compoundInterest = principal * pow((1 + (rate / 100)), time) - principal;

    // Step 3: Display the Result
    printf("Compound Interest = %.2f\n", compoundInterest);

    return 0;

Running the Program

To run the program, follow these steps:

  1. Set up a C programming environment on your computer.
  2. Copy the sample code provided into a C compiler or an integrated development environment (IDE) such as Code::Blocks or Dev-C++.
  3. Build and run the program.
  4. Input the required values when prompted.
  5. The program will then calculate and display the compound interest.


In this comprehensive guide, we have explored the process of writing a C program for compound interest. By following the outlined steps and utilizing the provided sample code, you can create an efficient program that accurately calculates compound interest based on user input.

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