Here is what needs to be done. I have the skeleton code too which i have included right after the instructions. This program must compile in Dev C++ and it needs to be in the format in the instructions.
Objectives
1. Review use of if statements and loops.
2. Learn how to write functions given specifications.
3. Learn how to use pass by reference variables.
4. Learn how to put together a useful program given a skeleton of that program and the
functions and their specifications necessary in the implementation.
Problem: Lemonade Stand
Last summer your friend has a lemonade stand and made lots of money. You want to do the same! You have plenty of time to plan, so you thought you would be pre
pared when summer came around by writing a program to simulate your lemonade stand. The basic idea behind the simulation is as follows:
1) You will simulate 10 days of running the lemonade stand.
2) In the beginning the user gets a $20.00 loan to run the lemonade stand.
3) Before each day, the user gets an opportunity to buy bags of lemons and sugar.
4) At the beginning of each day the user receive a weather report.
5) Based on that, the user is asked to price a cup of lemonade for that day.
6) Then, the days sales are simulated. (Part of this is written for you.)
7) Afterwards, the user is prompted with a status report of how much money they have left and how many bags of lemons and sugar they have left.
What you have to do
A skeleton of the solution for this assignment is posted on WebCourses and the course web page. Please use this skeleton. You must fill in the seven functions that are left for you to fill in, as well as write the remainder of main so the program works as described above. After you write each function, you should test it before moving on. How to do this will be covered in class. Then, write your main, calling the necessary functions from it to achieve the desired functionality. main can work without declaring any new variables than the ones already declared. But, you may declare new ones if you wish.
Perhaps the biggest problem you will have will be not knowing when to make function calls. The goal of having these functions is to make the coding process more manageable. In particular, it is possible that a function might “do” something complicated, but that just really means that function makes calls to other functions that carry out a majority of that work already. In essence, if you write a function A to do a task, then don’t write out the code that also does that task in another function B. Instead call the function A from the body of function B.
References
Textbook: Chapters 9, 10, 11 Notes: Lectures 13, 14, 15, 17
Output Sample
Two full output samples of the program running will be provided on Webcourses and the course web page in the files lemonade.out and lemonade2.out.
Deliverables
You must submit your solution to the problem, lemonade.c, over WebCourses.
Restrictions
Although you may use other compilers, your program must compile and run using DevC++. Please use DevC++ to develop your program. Your program should include a header comment with the following information: your name, course number, section number, assignment title, and date. Also, make sure you include ample comments throughout your code describing the major steps in solving the problem.
Grading Details
Your program will be graded upon the following criteria:
1) Your correctness
2) Your programming style and use of white space. (Even if you have a plan and your program works perfectly, if your programming style is poor or your use of white space is poor you could get 10% or 15% deducted from your grade.)
3) Compatibility to DevC++. (If your program does not compile in this environment, you will get a sizable deduction from your grade, likely to be over 50%)
The code Skeleton:
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
// Symbolic constants to be used.
// Prices of bags of sugar and lemon, respectively.
#define PRICE_LEMON 3.50
#define PRICE_SUGAR 2.00
// Fraction of a bag of lemons and sugar used on a single cup of lemonade.
#define LEMON_PER_CUP 0.03
#define SUGAR_PER_CUP 0.04
// The initial loan the user is given to start their lemonade stand.
#define START_MONEY 20.00
// Using symbolic constants for true and false.
#define FALSE 0
#define TRUE 1
void buy_lemons(double *pLemons, double *pMoney);
void buy_sugar(double *pSugar, double *pMoney);
int weather();
int num_cups_sold(int weather, int cost);
void status_report(double cash, double num_lemons, double num_sugar, int day);
int max_sell(double num_lemons, double num_sugar);
int get_cost();
void sell_cups(double *pMoney, double *pLemons, double *pSugar);
void end_message(double money);
int main() {
int num_day, ans;
double money = START_MONEY, num_lemons = 0, num_sugar = 0;
srand(time(0));
printf(“Welcome to the Game of Lemonade!nn”);
printf(“You start the game with $%.2lf and no supplies!n”, START_MONEY);
// Loop through each day. Ask the user if they want to buy lemons. If so,
// carry out the transaction. Then ask them if they want to buy sugar.
// If so, do this transaction as well. Then, let them sell lemonade for
// the day. Finally, print a status report after they’ve sold lemonade
// at the end of the day.
for (num_day = 1; num_day <= 10; num_day++) {
}
// Print out whether or not they have lost money, broke even or gained
// money.
return 0;
}
// Pre-conditions: pLemons and pMoney are pointers to variables that store
// the user’s number of bags of lemons left and amount of
// money left.
// Post-condition: The user is given the opportunity to buy lemons. If
// successful, the number of bags of lemons and the amount
// of money the user has are adjusted accordingly.
//
// What to do in this function: If the user doesn’t have enough money to
// even buy one bag of lemons, tell them so and return. Otherwise, ask
// the user how many bags of lemons they want to buy. If they answer less
// than one, tell them they must get more and reprompt them. If they
// answer more than they can buy, tell them they don’t have that much
// money and reprompt them. Continue prompting them until they answer with
// a valid value. Then process the transaction.
void buy_lemons(double *pLemons, double *pMoney) {
}
// Pre-conditions: pSugar and pMoney are pointers to variables that store
// the user’s number of bags of lemons left and amount of
// money left.
// Post-condition: The user is given the opportunity to buy sugar. If
// successful, the number of bags of sugar and the amount
// of money the user has are adjusted accordingly.
//
// What to do in this function: If the user doesn’t have enough money to
// even buy one bag of sugar, tell them so and return. Otherwise, ask
// the user how many bags of sugar they want to buy. If they answer less
// than one, tell them they must get more and reprompt them. If they
// answer more than they can buy, tell them they don’t have that much
// money and reprompt them. Continue prompting them until they answer with
// a valid value. Then process the transaction.
void buy_sugar(double *pSugar, double *pMoney) {
}
// Pre-condition: None
// Post-condition: The weather report for the day is printed and the
// corresponding weather status in between 1 and 5,
// inclusive, is returned.
int weather() {
// Get the weather status value.
int retval = rand()%5 + 1;
printf(“nHere is today’s weather forecast:n”);
// Print out the appropriate forecast for that status.n”);
if (retval == 1)
printf(“It is cloudy with a high chance of rain.n”);
else if (retval == 2)
printf(“It is partly cloudy and windy.n”);
else if (retval == 3)
printf(“It is partly sunny with low humidity.n”);
else if (retval == 4)
printf(“It is warm and sunny with medium winds.n”);
else
printf(“It’s a perfect beach day. Sunny and hot!n”);
return retval; // Return this status value.
}
// Pre-condition: weather is an integer in between 1 and 5, inclusive,
// standing for the weather status for the day. cost is
// the cost of a cup of lemonade in cents for that day.
// Post-condition: The number of cups of lemonade for that day is returned.
int num_cups_sold(int weather, int cost) {
int optimal_price, max_cups;
double max_income;
// Calculate a maximum revenue for the day.
max_income = 5 + 3*weather;
optimal_price = 15 + 5*weather;
max_income = max_income – fabs(optimal_price – cost)/1.5;
// If it’s lower than 5 dollars, reset it to 5 dollars.
if (max_income < 5)
max_income = 5;
// From this, determine the maximum number of cups that could be sold.
max_cups = (int)(max_income/((double)cost/100));
// Return a random number from 0 to this maximum.
return rand()%(max_cups+1);
}
// Pre-condition: cash is the amount of cash the user has, num_lemons is
// the number of bags of lemons the user has left, num_sugar
// is the number of bags of sugar the user has left, and day
// is which day of the game just finished.
// Post-condition: A status report with the four values passed in is nicely
// displayed for the user.
//
// What to do with this function: This is fairly self-explanatory from the
// pre and post conditions. Look to the sample given in the assignment for
// the format.
void status_report(double cash, double num_lemons, double num_sugar, int day) {
}
// Pre-condition: pMoney, pLemons and pSugar are pointers to the variables
// storing the user’s amount of cash, number of bags of
// lemons and number of bags of sugar.
// Post-condition: A day’s transactions will take place and the amount of
// money, the number of bags of lemons and sugar will be
// adjusted accordingly.
//
// What to do with this function: First prompt the user with the weather
// report. Then, ask the user for how much they want to sell a cup of
// lemonade. Determine the number of cups that actually get sold for the
// day by determining how many cups the user COULD sell based on the
// availability of supplies and how many cups they COULD sell based on the
// weather. Print out how many cups of lemonade they ended up selling.
// Then adjust the amount of money they have, as well as the number of bags
// of lemons and sugar.
void sell_cups(double *pMoney, double *pLemons, double *pSugar) {
}
// Pre-condition: num_lemons is the number of bags of lemons the user has,
// and num_sugar is the number of bags of sugar they have.
// Post-condition: The function returns the maximum number of cups of
// lemonade the user can sell based on available supplies.
//
// What to do with this function: Calculate how many full cups of lemonade
// you can supply with sugar. Do the same calculation for lemons. Then,
// return the smaller of these two values.
int max_sell(double num_lemons, double num_sugar) {
}
// Pre-condition: None.
// Post-condition: Returns the number of cents the user will sell a cup of
// lemonade for, for that day.
//
// What to do with this function: Prompt the user to enter how much they
// want to charge for a cup of lemonade. If they don’t enter a positive
// integer, reprompt them until they do. Then return this value.
int get_cost() {
}
// Pre-condition: money is the amount of money the user has left at the end
// of the 10 days of running their Lemonade Stand.
// Post-condition: The user’s overall loss or profit is printed out.
// What to do with this function: See if what they have left is less than
// what they started with. If so, print out how much the lost. If it’s equal
// just print out a message saying that they broke even. Otherwise, print
// out how much profit they made!
void end_message(double money) {
}
)
