Write a program in C++ to ask user to enter the value of principal amount (P), number of years (N) and rate (R). Then calculate and display simple interest (SI), compound interest (CI) and difference between them.

 here's a C++ program that asks the user to enter the principal amount, number of years, and rate, calculates and displays the simple interest, compound interest, and the difference between them:

#include <iostream>
#include <cmath>

using namespace std;

int main() {
    // Declare variables to store the user's input
    double principal, rate, si, ci, diff;
    int years;

    // Prompt the user to enter the principal amount
    cout << "Enter the principal amount: ";
    cin >> principal;

    // Prompt the user to enter the number of years
    cout << "Enter the number of years: ";
    cin >> years;

    // Prompt the user to enter the rate
    cout << "Enter the rate: ";
    cin >> rate;

    // Calculate the simple interest
    si = (principal * rate * years) / 100;

    // Calculate the compound interest
    ci = principal * pow((1 + rate/100), years) - principal;

    // Calculate the difference between the simple and compound interest
    diff = ci - si;

    // Display the results
    cout << "Simple Interest: " << si <<endl;
    cout << "Compound Interest: " << ci <<endl;
    cout << "Difference: " << diff <<endl;
    return 0;
}

Output:

Enter the principal amount: 5000
Enter the number of years: 3
Enter the rate: 7.5
Simple Interest: 1125
Compound Interest: 1277.63
Difference: 152.629

Explanation:

• The program declares double variables principal, rate, si, ci, and diff, and an integer variable years to store the user's input.
• The program prompts the user to enter the principal amount, number of years, and rate using the std::cout object and reads the input using the std::cin object.
• The program calculates the simple interest using the formula (P * R * N) / 100, where P is the principal amount, R is the rate, and N is the number of years.
• The program calculates the compound interest using the formula P * (1 + R/100)^N - P.
• The program calculates the difference between the compound interest and the simple interest.
• The program uses the std::cout object to print each result in a separate line, using the std::endl manipulator to insert a newline character after each output.
• The program returns 0 to indicate successful execution.