/*
 * Author: Amit Dutta (amitdutta4255@gmail.com) | Date: 12 Dec 2025
 * Repo: https://github.com/notamitgamer/bsc
 * License: MIT
 */

/* WAP to input sum (p), rate of interest (r), time (t) and type of interest
('s' for simple interest amd 'c' for compound interest). Calculate and display
the interest earned
    si = (p * r * t) / 100
    compoundInterest = p * ((1 + r / 100)^t - 1)
*/

#include <stdio.h>
#include <math.h>
#include <ctype.h>
int main()
{
    double principalAmount, rateOfInterest, timePeriod, simpleInterest, compoundInterest;
    char mode;
    printf("Enter the principle amount, Rate of interest, Time : ");
    scanf("%lf %lf %lf", &principalAmount, &rateOfInterest, &timePeriod);
    printf("\nEnter the mode ('s' : simple interest, 'c' : compound interest) : ");
    scanf(" %c", &mode);
    mode = tolower(mode);
    switch (mode)
    {
    case 's':
        simpleInterest = (principalAmount * rateOfInterest * timePeriod) / 100;
        printf("\nSimple Interest : %g", simpleInterest);
        break;
    case 'c':
        compoundInterest = principalAmount * (pow((1 + rateOfInterest / 100), timePeriod) - 1);
        printf("\nCompound Interest : %g", compoundInterest);
        break;
    default:
        printf("\nInvalid Input");
        return 1;
    }
    return 0;
}