C program to calculate simple interest

Here's a simple C program to calculate simple interest:

#include <stdio.h>

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

    // Input principal amount, rate of interest, and time period
    printf("Enter principal amount: ");
    scanf("%f", &principal);

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

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

    // Calculate simple interest
    simpleInterest = (principal * rate * time) / 100;

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

    return 0;
}

This program takes user input for the principal amount, rate of interest, and time period. It then calculates the simple interest using the formula: Simple Interest = (principal * rate * time) / 100. Finally, it displays the calculated simple interest.

Here's an example of what the output might look like when you run the program and input values:

Enter principal amount: 1000
Enter rate of interest: 5.5
Enter time period (in years): 2
Simple Interest = 110.00

In this example, the user entered a principal amount of 1000, a rate of interest of 5.5%, and a time period of 2 years. The program then calculated the simple interest using the formula and displayed the result, which is 110.00.