Programming with C++ - Day1 || Wong Edition || B.Tech Diaries

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Lab #1 - C++ Basics (Loops, Functions, Arrays)

  1. A software company sells a package that retails for $99. Quantity discounts are given according to the following table.

    Quantity Discount
    10-19 20%
    20-49 30%
    50-99 40%
    100 or more 50%

    Write a program that asks for the number of units sold and computes the total cost of the purchase. Declare the discount as constants.Input Validation: Make sure the number of units is greater than 0. 

    
#include <iostream>

int main(int argc, char const *argv[])
{
    int qty;
    // std::cout << "Enter no of units sold: ";
    while (std::cin >> qty)
    {
        if (qty > 0)
            break;
        std::cout << "No of units should be greater than 0" << std::endl;
        // std::cout << "Enter no of units sold: ";
    }
    double dis = 0;
    if (qty < 20)
        dis = 0.2;
    else if (qty < 50)
        dis = 0.3;
    else if (qty < 100)
        dis = 0.4;
    else
        dis = 0.5;
    double price = qty * 99 * (1 - dis);
    printf("\nTotal price is: %.2lf\n", price);
    return 0;
}

  2. Write a program that generates the day's sales report for five stores. The program asks for the sales figures as input anddisplays a bar graph comparing each store's sales.Create each bar in the bar graph by displaying a row of asterisks. Each asterisk represents $100 of sales.Here is an example of the program's output. 

    
Date: July 22, 2019
Name of Sales Manager: Tutu Pal
CityCentre:   **********
Park Street:  ************
Rajarhat:     ******************
South City:   ********
Dum Dum:      *******************
The store with the top sales on July 22, 2019 is Dum Dum.
The total sales is $xxxx.

    Use the function void printbar(string store, int sales) to generate the bar chart.

    
#include <iostream>

void printbar(std::string store, double sales, double sales_max)
{
    std::cout << store << ": \t";
    for (int j = 0; j < int(sales * 50.0 / sales_max); j++)
    {
        std::cout << "*";
    }
    std::cout << std::endl;
}

int main(int argc, char const *argv[])
{
    std::string date = "July 22, 2019", manager = "Tutu Pal";
    std::string store_names[5] = {"City Centre", "Park Street", "Rajarhat", "South City", "Dum Dum"};
    double store_sales[5], total_sales = 0;
    int max = 0;

    for (int i = 0; i < 5; i++)
    {
        // std::cout << "Enter sales for store " << i + 1 << ": ";
        std::cin >> store_sales[i];
        total_sales += store_sales[i];
        if (store_sales[max] < store_sales[i])
            max = i;
    }
    std::cout << "\nDate:\t" << date << "\nName of Sales Manager:\t" << manager << std::endl;

    for (int i = 0; i < 5; i++)
    {
        printbar(store_names[i], store_sales[i], store_sales[max]);
    }

    std::cout << "\nThe store with the top sales on " << date << " is " << store_names[max] << std::endl;
    printf("\nThe total sales is $%.2lf.\n\n", total_sales);
    return 0;
}

  3. Write a C++ program to implement the Number Guessing Game. In this game the computer chooses a random number between 1 and 100, and the player tries to guess the number in as few attempts as possible. Each time the player enters a guess, the computer tells him whether the guess is too high, too low, or right. Once the player guesses the number, the game is over. 

    
#include <iostream>

int main(int argc, char const *argv[])
{
    std::cout << "======NUMBER GUESSING GAME=======" << std::endl;
    int guess, number = rand() % 200 + 1;
    std::cout << "Guess a number between 1 and 200" << std::endl;
    std::cin >> guess;
    while (guess != number)
    {
        if (guess > number)
        {
            std::cout << "Your guess is too high!!" << std::endl;
        }
        else
        {
            std::cout << "Your guess is too low!!" << std::endl;
        }
        std::cin >> guess;
    }
    std::cout << "You guessed the number " << number << std::endl;
    return 0;
}
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