Write a C Program to Find Compound Interest.

In this article, we will calculate the compound interest. Compound interest can be calculated using the formula.

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

Where:

Principal: The initial amount of money.

Rate: The rate of interest per annum.

Time: The time period in years.

Here's a C program to Find Compound Interest:

#include<stdio.h>

#include<conio.h>

void main()

{

    // Declare and initialize variables

    float principal, rate, time, compoundInterest;

    // Get input from the user

    printf("Enter the principal amount: ");

    scanf("%f", &principal);

    printf("Enter the rate of interest (per annum): ");

    scanf("%f", &rate);

    printf("Enter the time (in years): ");

    scanf("%f", &time);

    // Calculate compound interest

    compoundInterest = principal * (pow(1 + (rate / 100), time)) - principal;

    // Display the result

    printf("Principal Amount: $%.2f\n", principal);

    printf("Rate of Interest: %.2f%%\n", rate);

    printf("Time (in years): %.2f\n", time);

    printf("Compound Interest: ₹%.2f\n", compoundInterest);

}

• We first declare three variables principal, rate, and time to store the input values. 
• We then use printf and scanf functions to get these values from the user. 
• After obtaining the values, we calculate the compound interest using the formula and store it in the variable compoundInterest. 
• Finally, we display the result using printf with %.2f to print the result up to two decimal places.

Output: