C Exercises: Compute the simple interest

Last update on September 18 2025 12:35:45 (UTC/GMT +8 hours)

Calculate simple interest (P, R, T)

Write a C program that accepts the principle, rate of interest, and time and calculates simple interest.

Pictorial Presentation:

C Programming: Compute the simple interest

Sample Solution:

C Code:

#include<stdio.h>
int main() {
    int p, r, t, int_amt;

    // Prompt user to input principle, rate of interest, and time
    printf("Input principle, Rate of interest & time to find simple interest: \n");
    scanf("%d%d%d", &p, &r, &t);

    // Calculate simple interest
    int_amt = (p * r * t) / 100;

    // Display the calculated simple interest
    printf("Simple interest = %d", int_amt);

    return 0;
}

Sample Output:

Input Data: p = 10000, r = 10% , t = 12 year
Input principle, Rate of interest & time to find simple interest: 
Simple interest = 12000

Flowchart:

For more Practice: Solve these Related Problems:

Write a C program to calculate compound interest iteratively and compare it with simple interest.
Write a C program to compute simple interest and then determine the total amount payable.
Write a C program to calculate simple interest using a user-defined function with input validation.
Write a C program to compute both simple and compound interest and display the difference between them.

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