#include <iostream>
#include <iomanip>
using namespace std;

const int NUM_PRODUCTS = 3; // Number of products

float calculateTotalPrice(float price, int quantity);

int main() {
    float price[NUM_PRODUCTS];
    int quantity[NUM_PRODUCTS];

    // Input prices and quantities for each product
    for (int i = 0; i < NUM_PRODUCTS; ++i) {
        cout << "Enter price for product " << i + 1 << ": ";
        cin >> price[i];
        cout << "Enter quantity for product " << i + 1 << ": ";
        cin >> quantity[i];
    }

    // Calculate total price for each product
    float totalPrices[NUM_PRODUCTS];
    for (int i = 0; i < NUM_PRODUCTS; ++i) {
        totalPrices[i] = calculateTotalPrice(price[i], quantity[i]);
    }

    // Calculate overall total price
    float overallTotalPrice = 0;
    for (int i = 0; i < NUM_PRODUCTS; ++i) {
        overallTotalPrice += totalPrices[i];
    }

    // Display results
    cout << fixed << setprecision(2);
    for (int i = 0; i < NUM_PRODUCTS; ++i) {
        cout << "Total price for product " << i + 1 << ": " << totalPrices[i] << endl;
    }
    cout << "Overall total price including GST: " << overallTotalPrice << endl;

    return 0;
}

// Function to calculate total price including GST for a product
float calculateTotalPrice(float price, int quantity) {
    const float GST_RATE = 0.18;
    float totalPrice = price * quantity * (1 + GST_RATE);
    return totalPrice;
}


2)
#include <iostream>
#include <cmath>
using namespace std;

const float PI = 3.14159;

float calculateArea(char shape) {
    float area = 0.0;

    switch (shape) {
        case 'C': // Circle
            {
                float radius;
                cout << "Enter the radius of the circle: ";
                cin >> radius;
                area = PI * pow(radius, 2);
            }
            break;

        case 'T': // Triangle
            {
                float base, height;
                cout << "Enter the base of the triangle: ";
                cin >> base;
                cout << "Enter the height of the triangle: ";
                cin >> height;
                area = 0.5 * base * height;
            }
            break;

        case 'U': // Cuboid
            {
                float length, width, height;
                cout << "Enter the length of the cuboid: ";
                cin >> length;
                cout << "Enter the width of the cuboid: ";
                cin >> width;
                cout << "Enter the height of the cuboid: ";
                cin >> height;
                area = 2 * (length * width + length * height + width * height);
            }
            break;

        default:
            cout << "Invalid shape code!" << endl;
    }

    return area;
}

int main() {
    char shape;

    // Calculate area of a circle
    cout << "Enter 'C' for circle: ";
    cin >> shape;
    cout << "Area of the circle: " << calculateArea(shape) << endl;

    // Calculate area of a triangle
    cout << "Enter 'T' for triangle: ";
    cin >> shape;
    cout << "Area of the triangle: " << calculateArea(shape) << endl;

    // Calculate area of a cuboid
    cout << "Enter 'U' for cuboid: ";
    cin >> shape;
    cout << "Area of the cuboid: " << calculateArea(shape) << endl;

    return 0;
}




3)a
#include <iostream>
using namespace std;

int main() {
    int n;
    cout << "Enter an integer: ";
    cin >> n;

    // Using a loop instead of recursion
    unsigned long factorial = 1;
    for (int i = 1; i <= n; ++i) {
        factorial *= i;
    }

    cout << "Factorial of " << n << " is " << factorial << endl;

    return 0;
}



3)b
#include <iostream>
using namespace std;

int main() {
    int n;
    cout << "Enter a positive integer: ";
    cin >> n;

    // Without using recursion, using a while loop
    int factorial = 1;
    int i = 1;
    while (i <= n) {
        factorial *= i;
        i++;
    }

    cout << "Factorial of " << n << " is " << factorial << endl;

    return 0;
}



4)
#include <iostream>
#include <iomanip>
using namespace std;

// Inline function to calculate total price including GST for a product
inline float calculateTotalPrice(float price, int quantity) {
    const float GST_RATE = 0.18;
    return price * quantity * (1 + GST_RATE);
}

int main() {
    // Product 1
    float price1;
    int quantity1;
    cout << "Enter price for product 1: ";
    cin >> price1;
    cout << "Enter quantity for product 1: ";
    cin >> quantity1;

    // Product 2
    float price2;
    int quantity2;
    cout << "Enter price for product 2: ";
    cin >> price2;
    cout << "Enter quantity for product 2: ";
    cin >> quantity2;

    // Product 3
    float price3;
    int quantity3;
    cout << "Enter price for product 3: ";
    cin >> price3;
    cout << "Enter quantity for product 3: ";
    cin >> quantity3;

    // Calculate total price for each product using inline function
    float totalPrice1 = calculateTotalPrice(price1, quantity1);
    float totalPrice2 = calculateTotalPrice(price2, quantity2);
    float totalPrice3 = calculateTotalPrice(price3, quantity3);

    // Calculate overall total price
    float overallTotalPrice = totalPrice1 + totalPrice2 + totalPrice3;

    // Display results
    cout << fixed << setprecision(2);
    cout << "Total price for product 1........: " << totalPrice1 << endl;
    cout << "Total price for product 2........: " << totalPrice2 << endl;
    cout << "Total price for product 3........: " << totalPrice3 << endl;
    cout << "Overall total price including GST: " << overallTotalPrice << endl;

    return 0;
}