C program to calculate Simple Interest

Write a C program to input principle (amount), time and rate (P, T, R) from user and find Simple Interest. How to calculate simple interest in C programming. Logic to find simple interest in C program.

Example
Input

Enter principle: 1200
Enter time: 2
Enter rate: 5.4

Output

Simple Interest = 129.600006

Required knowledge

Fundamentals of C, Data types, Talking user input in C

Simple Interest formula

Simple interest formula is given by.
Simple interest formula

Where,
P is the principle amount
T is the time and
R is the rate

Logic to calculate simple interest

Step by step descriptive logic to calculate simple interest.

  1. Input principle amount in some variable say principle.
  2. Input time in some variable say time.
  3. Input rate in some variable say rate.
  4. Apply formula to calculate simple interest i.e. SI = (principle * time * rate) / 100.
  5. Finally, print the resultant value of SI.

Program to calculate simple interest

/**
 * C program to calculate simple interest
 */

#include <stdio.h>

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

    // 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 simple interest
    SI = (principle * time * rate) / 100;

    printf("Simple Interest = %f", SI);

    return 0;
}

Output

Enter principle (amount): 1200
Enter time: 2
Enter rate: 5.4
Simple Interest = 129.600006

Happy coding 😉

Write your doubts or suggestion. I will try my best to help. You must escape source code before commenting. To format your source code paste your source code inside
<pre><code> ----Your Source Code---- </code></pre>