⓮C Program to calculate Simple Interest (With Program and Explanation)

📌Program to calculate Simple Interest

 Simple Interest Formula :-

$$\text{Simple Interest (SI)}=\frac{P\times R\times T}{\mathrm{100}}$$

Where:

• P = Principal amount

• R = Rate of interest (per year)

• T = Time (in years)

---

🧾 C Program to Calculate Simple Interest

#include <stdio.h>

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

    // Taking input from the user
    printf("Enter Principal Amount: ");
    scanf("%f", &principal);

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

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

    // Calculating Simple Interest
    simpleInterest = (principal * rate * time) / 100;

    // Displaying the result
    printf("Simple Interest = %.2f", simpleInterest);

    return 0;
}

---

🧠 Explanation of the Program

1️⃣ Header File

#include <stdio.h>

• This header file is used for input and output functions like printf() and scanf().

---

2️⃣ Variable Declaration

float principal, rate, time, simpleInterest;

• principal → stores the principal amount

• rate → stores the rate of interest

• time → stores time in years

• simpleInterest → stores the calculated SI

float is used to handle decimal values.

---

3️⃣ Taking Input

scanf("%f", &principal);
scanf("%f", &rate);
scanf("%f", &time);

• These statements take values from the user.

---

4️⃣ Calculation

simpleInterest = (principal * rate * time) / 100;

• Applies the Simple Interest formula.

---

5️⃣ Output

printf("Simple Interest = %.2f", simpleInterest);

• Displays the result up to 2 decimal places.

---

🔍 Sample Output

Enter Principal Amount: 5000
Enter Rate of Interest: 5
Enter Time (in years): 2
Simple Interest = 500.00

---

✅ Key Points (For Blog Highlight)

• Uses basic arithmetic

• Beginner-friendly C program

• Real-life application

• Uses float for accuracy

---

📝 Conclusion

This program demonstrates how to calculate Simple Interest using simple arithmetic operations. 

📘 C Programming Series – What’s Next?
👉 In the next post of this series, we will learn how to find area of a circle with complete explanation and output examples. Stay tuned! 🚀