Checkpoint A For Checkpoint A, you will need to demonstrate a program that does the following: 1. Prompts the user for the parameters of the model: xx, 6, 7, 8 If a user inputs a negative value for any of these parameters, the program should immediately print an error message and exit. 2. Prompts the user to enter the initial values of the populations ko, uo, representing thousands of individuals. • If a user inputs a negative value for the initial population for either kelp or urchins, the program should treat the population as zero. 3. The program should calculate and output the populations k₁, ₁. Outputs should be shown with precision 3 decimal places, representing the population in thousands. The population should never grow negative (treat negative populations as zero). Sample Output Sample input/output behavior for Checkpoint A are provided below. Your program's spacing, spelling, capitalization, and punctuation will need to match the sample output EXACTLY for this project. Ex 1 Sample Input/Output Given inputs a, 3, 7, 8, ko, un as: 1.5 .001 .05 2.5 100 2 The program outputs ==>Bull Kelp and Purple Urchin Population Simulator <== Model Parameters Kelp growth rate: Kelp death rate: Urchin birth rate: Urchin death rate: Initial Population Kelp population (in thousands) at t = 0: Urchin population (in thousands) at t = 0: Simulation --- Time t= 0: 100.000k kelp, 2.000k urchins Time t = 1: 249.800k kelp, 7.000k urchins

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Checkpoint A
For Checkpoint A, you will need to demonstrate a program that does the following:
1. Prompts the user for the parameters of the model: x, 3, 7, 8
• If a user inputs a negative value for any of these parameters, the program should immediately print an error message and exit.
2. Prompts the user to enter the initial values of the populations ko, uo, representing thousands of individuals.
• If a user inputs a negative value for the initial population for either kelp or urchins, the program should treat the population as
zero.
3. The program should calculate and output the populations k₁, ₁. Outputs should be shown with precision 3 decimal places,
representing the population in thousands. The population should never grow negative (treat negative populations as zero).
Sample Output
Sample input/output behavior for Checkpoint A are provided below. Your program's spacing, spelling, capitalization, and punctuation will
need to match the sample output EXACTLY for this project.
Ex 1 Sample Input/Output
Given inputs a, 3, 7, 8, ko, un as:
1.5
.001
.05
2.5
100
2
The program outputs
==> Bull Kelp and Purple Urchin Population Simulator <==
Kelp growth rate:
Kelp death rate:
Urchin birth rate:
Urchin death rate:
Model Parameters
---
Initial Population
Kelp population (in thousands) at t = 0:
Urchin population (in thousands) at t = 0:
---
---
Simulation ---
Time t = 0: 100.000k kelp, 2.000k urchins
Time t = 1: 249.800k kelp, 7.000k urchins

Ex 2 Sample Input/Output
Given a negative rate a, 6, 7, 8, ko, uo as:
-2
The program outputs
---
Bull Kelp and Purple Urchin Population Simulator
Model Parameters
Kelp growth rate:
Error: cannot have a negative growth rate
1.5
.001
.05
2.5
100
-2
Ex 3 Sample Input/Output
Given a negative population size a, b, y, 8, kỵ, u as:
The program outputs
==> Bull Kelp and Purple Urchin Population Simulator <==
Model Parameters
---
Kelp growth rate:
Kelp death rate:
Urchin birth rate:
Urchin death rate:
Initial Population
Kelp population (in thousands) at t = 0:
Urchin population (in thousands) at t = 0:
---
Simulation
Time t = 0: 100.000k kelp, 0.000k urchins
Time t = 1: 250.000k kelp, 0.000k urchins

Expert Solution

Step 1

Note: In the Below Program, input parameters will be as follows a1, a2, a3, a4, k1, k2 and output will be f1, f2. So Please take them as reference.

Program Approach:

Print the title and headers for the program output.
Prompt the user for the parameters of the model: a1, a2, a3, and a4. These are the growth and death rates for kelp and urchins.
Check if any of the parameters are negative. If any of them is negative, the program prints an error message and exits.
Prompt the user for the initial values of the population k1, k2, representing the number of individuals in thousands.
Check if either of the initial populations is negative. If either of them is negative, the program treats the population as zero.
Calculate the populations f1 and f2 at t=1 using the formula:

f1 = k1 + k1 * a1 - k1 * a2 * k2
f2 = k2 + k2 * a3 * k1 - k2 * a4
Check if either of the populations at t=1 is negative. If either of them is negative, the program treats the population as zero.
Output the populations at t=0 and t=1 with precision 3 decimal places, representing the population in thousands.
The program ends after printing the final output.

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