Please help with a task.

Question

0.00/5 (No votes)

See more:

Create a zoo structure to represent animals at a zoo. Let the structure contain the following data: number (integer), name, weight (in kilograms). Declare an array with three elements of the described zoo structure and test the following functions. Create the following features:
• Function animal_create by which the keyboard is entered: number, name, weight(0.5 t)
• Function output_animal to derive animal data
• Function double_weight that doubles the weight of all animals

What I have tried:

C++

#include <iostream>;
using namespace std;
int main()
{

    struct Zoo
    {
        int number;
        string name;
        double weight;
    }

    Zoo animal_create(int number, string name, double weight)
    {
        Zoo zoo;
        zoo.number = number;
        zoo.name = name;
        zoo.weight = weight;
        retrun zoo;
    }

    void output_animal(Zoo zoo[3])
    {
        for (int i = 0; i < 3; i++)
        {
            cout >> zoo[i];
        }
    }

    Zoo double_weight(Zoo zoo)
    {
        zoo.weight = zoo.weight * 2;
    }

    int main()
    {
        Zoo zoo[3];
        int number;
        string name;
        double weight;
        for (int i = 0; i < 3; i++)
        {
            cin >> number;
            cin >> name;
            cin >> weight;
            animal_create(number, name, weight);
        }

        output_animal();

        cin >> number;
        double_weight(zoo[number]);
    }
}

Posted 1-Jan-23 20:24pm

Member 15879274

Updated 2-Jan-23 13:20pm

OriginalGriff

v2

Add a Solution

4 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Answer 1 · 2023-01-01T20:50:00

For starters, your animal_create function returns zoo instance that you ignore - so the data the user entered is lost when the function exits.

To add to that, the instance it returns is local to the function, so it is destroyed once the function ends, so you couldn't save and use it if you wanted to! (This is canned a dangling reference and is a common fault which is very hard to track down)

You don't pass anything to your output animal function at all!

Pass a pointer to the the array element to animal_create function so it can fill in the details that the user entered instead; pass the right parameter to your other functions.

Rick York · Answer 2 · 2023-01-01T21:10:00

Solution 2

You have a main function embedded within another main function. The compiler is not going to like that. You should remove the outer main function and its braces and the inner main function should work OK for you.

Posted 1-Jan-23 21:10pm

Rick York

CPallini · Answer 3 · 2023-01-01T21:35:00

There are several errors in your code.
I made a working skeleton starting from it. I've also marked some of the errors I recognized.

#include <iostream> // NO ';' here
using namespace std;

// struct and function declarations OUTSIDE main definition
struct Zoo
{
  int number;
  string name;
  double weight;
};

Zoo animal_create(int number, string name, double weight);
void output_animal(const Zoo & z);
void double_weight(Zoo  z[], size_t items );

constexpr size_t Items = 3;

int main()
{
  Zoo zoo[Items];
  int number;
  string name;
  double weight;
  for (size_t i = 0; i < Items; i++)
  {
    cin >> number;
    cin >> name;
    cin >> weight;
    zoo[i] = animal_create(number, name, weight); // assign the i-th item of the array
  }

  for (size_t i = 0; i < Items; i++)
    output_animal(zoo[i]);

  double_weight(zoo, Items);

  for (size_t i= 0; i < Items; i++)
    output_animal(zoo[i]);
}

Zoo animal_create(int number, string name, double weight)
{
  Zoo a;
  a.number = number;
  a.name = name;
  a.weight = weight;
  return a; // it is 'return' NOT 'retrun'
}


void output_animal(const Zoo & z)
{
  cout << "...your implementation here..\n";
}

void double_weight(Zoo zoo[], size_t items )
{
  for (size_t i=0; i<items; ++i)
    zoo[i].weight = 2 * zoo[i].weight; // double the weight of i-th item
}

merano99 · Answer 4 · 2023-01-02T13:20:00

Although the question was asked rather vaguely, there are a few places here where help would probably be needed.

Here are some points, in order :
1. Comment the outer main out

// int main()

2. missing semicolon

struct Zoo { .. };

3. typo at return

return zoo;

4. wrong direction at cout, missing overload for data type zoo

cout << zoo[i].name;

5. use c++ datatype for container

// Zoo zoo[3];
vector<Zoo> zoo;

6. Dont forget to add animal to zoo container

zoo.push_back(animal_create(number, name, weight));

7. missing parameter at output

output_animal(zoo);

8. doubles the weight of ALL animals

// double_weight(zoo[number]);
double_weight(zoo);

Please help with a task.

4 solutions

Solution 1

Solution 2

Solution 3

Solution 4

Add your solution here

Preview 0