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

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;
   }