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POI'm in trouble with creating new object in C++
 

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  1. POI'm in trouble with creating new object in C++
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    <p>I'm new to C++ and I'm having a trouble with it. I've tried to create new object without (*), so <code>Animal a1;</code> but it didn't work. So now I'm using <code>Animal* a1;</code>, and it works, but the problem is that it says it has to be initialised. I made a default constructor, so doesn't it mean that it initialises automatically or should I initialise it again? These are my code:</p> <h2><code>Animal.cpp</code>:</h2> <pre><code>#include "Animal.h" using namespace std; Animal::Animal(int newid, double newweight, int yy, int mm, int dd, double newaccDose, char newsex) { id = newid; weight = newweight; yy = yy; mm = mm; dd = dd; dose = newaccDose; sex = newsex; } Animal::Animal() { id = 0; weight = 0; yy = 0; mm = 0; dd = 0; dose = 0; sex = ' '; } Animal::~Animal(){} double Animal::getDaysDifference(){ jdate dateOfBirth(dd,mm,yy); jdate now; double diff = now-dateOfBirth; return diff; } void Animal::addAnimal(){ int select=0; while(select==1 || select==2){ cout &lt;&lt; "1. Cattle 2. Sheep" &lt;&lt; endl; cout &lt;&lt; "Select a type of animal: "; cin &gt;&gt; select; cout &lt;&lt; "Invalid number please try again" &lt;&lt; endl; } } </code></pre> <h2><code>Animal.h</code></h2> <pre><code>#ifndef ANI_H #define ANI_H #include &lt;vector&gt; #include "Treatment.h" #include "jdate.h" class Animal{ protected: int id; double weight; int yy; int mm; int dd; double dose; char sex; //Treatment treatArray[]; public: Animal(); Animal(int newid, double newweight, int yy, int mm, int dd, double newdose, char newsex); ~Animal(); virtual double calcDose() = 0; void addAnimal(); void questions(); // ask questions like id,weight, and so on double getDaysDifference(); }; #endif </code></pre> <h2><code>DrugAdmin.cpp</code></h2> <pre><code>//Main function #include &lt;iostream&gt; #include "Animal.h" #include "Cattle.h" using namespace std; int main(){ Animal* a1; a1-&gt;addAnimal(); } </code></pre> <p>I just did it to check if the <code>addAnimal()</code> function is working but apparently it's not. Can you please give me a piece of advice? </p> <p>Cheers</p>
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