C Program to Calculate Compound Interest

C program to calculate compound interest; Through this tutorial, you will learn how to calculate compound interest in the c program with the help of function, and normal formula.

Programs to Calculate Compound Interest in C

• Algorithm to Calculate Compound Interest
• C Program to Calculate Compound Interest using Formula
• C Program to Calculate Compound Interest using Function

Algorithm to Calculate Compound Interest

Use the following algorithm to write a program to calculate compound interest; as follows:

• Get input principle amount and store in some variable.
• Get input time and store in some variable..
• Get input rate and store in some variable..
• To calculate compound interest using formula CI = principal*((1+rate/100)time-1).
• Finally, print the result of compound interest.

C Program to Calculate Compound Interest using Formula

/* C program to enter P, T, R, and calculate Compound Interest */

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

int main()
{
    float principle, time, rate, CI;

    /* Input principle, rate and time */
    printf("Enter principle (amount): ");
    scanf("%f", &principle);

    printf("Enter time: ");
    scanf("%f", &time);

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

   /* Calculate compound interest */
    CI = principle * (pow((1 + rate / 100), time));

    /* Print the resultant value of CI */
    printf("Compound Interest = %f", CI);

    return 0;
}

The output of the above c program; as follows:

Enter principle (amount): 5000
Enter time: 7
Enter rate: 9
Compound Interest = 9140.197266

C Program to Calculate Compound Interest using Function

/* C program to enter P, T, R, and calculate Compound Interest using function */

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

// function for finding compound interest
float CmInt(float p, float r, float t) 
{
    float ci;   
    ci = p * (pow((1 + r / 100), t));
    return ci; // returning yhe value of ci
}

int main()
{
    float principle, time, rate, CI;

    /* Input principle, rate and time */
    printf("Enter principle (amount): ");
    scanf("%f", &principle);

    printf("Enter time: ");
    scanf("%f", &time);

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

    /* Call function with paramters to Calculate compound interest */
     CI = CmInt(principle, rate, time); 

    /* Print the resultant value of CI */
    printf("Compound Interest = %f", CI);

    return 0;
}

The output of the above c program; as follows:

Enter principle (amount): 1000
Enter time: 5
Enter rate: 5
Compound Interest = 1276.281250