[C++]dynamic structure/variables help!(solved)

[gh0st]

well guys Im just doing an exercise I already did it but It doesnt seem to work correctly well basicly are 2 exercises check it out:

5. The CandyBar structure contains three members. The first member holds the brand
name of a candy bar. The second member holds the weight (which may have a fractional
part) of the candy bar, and the third member holds the number of calories (an integer
value) in the candy bar. Write a program that declares such a structure and creates a
CandyBar variable called snack, initializing its members to “Mocha Munch”, 2.3, and
350, respectively. The initialization should be part of the declaration for snack. Finally,
the program should display the contents of the snack variable.

6. The CandyBar structure contains three members, as described in the previus exercise Write a program that creates an array of three CandyBar structures, initializes them to
values of your choice, and then displays the contents of each structure.

so I did:

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#include <iostream>
#include <string.h>

struct barsnames
{
    char candyname[20];
    float weight;
    int calories;
};
int main()
{
    using namespace std;
    char candyname[20] = "Mocha Munch";
    float weight = 2.3;
    int calories = 350;
   
    barsnames * barsnames_ptr = new barsnames;
    strcpy(barsnames_ptr->candyname, candyname);
    barsnames_ptr->weight, weight;
    barsnames_ptr->calories, calories;
   
    cout << (*barsnames_ptr).candyname;
    cout << endl;
    cout <<  barsnames_ptr->weight;
    cout << endl;
    cout << barsnames_ptr->calories;
    cout << endl;
   
    delete barsnames_ptr;
    system("pause");
    return 0;
}
and I did this to the question 6:

Code: [Select]

#include <iostream>
#include <string.h>

struct barsnames
{
    char candyname[20];
    float weight;
    int calories;
};
int main()
{
    using namespace std;
    char arrayall[2];
    char arrayall[0] = candynameS;
    char arrayall[1] = weightS;
    char arrayall[2] = caloriesS;
   
    barsnames * barsnames_ptr = new barsnames;
    strcpy(barsnames_ptr->candynameS, candyname);
    strcpy(barsnames_ptr->weightS, weight);
    strcpy(barsnames_ptr->caloriesS, calories);
   
    cout << arrayall[3];
    cout << endl;
   
    delete barsnames_ptr;
    system("pause");
    return 0;
}
well at least I get an output on my first source code but at the second one it doesnt even compile can someone help me plz? thanx in advance

[Satan911]

They want you to create an array of barsnames. That's not what you are doing.

Try:

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barsnames * barsnames_array_ptr = new barsnames[3];
And then to delete it you'll have to use:

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delete [] barnames_array_ptr;
Go on from there.. Basically the same as the example but for each item of your array.

[gh0st]

well Satan911 first of all thanx for your support this time the answer seems to be something like this:

Code: [Select]

#include <iostream>
struct inflatable
{
char name[20];
float volume;
double price;
};
int main()
{
using namespace std;
inflatable guests[2] = // initializing an array of structs
{
{“Bambi”, 0.5, 21.99}, // first structure in array
{“Godzilla”, 2000, 565.99} // next structure in array
};
cout << “The guests “ << guests[0].name << “ and “ << guests[1].name
<< “\nhave a combined volume of “
<< guests[0].volume + guests[1].volume << “ cubic feet.\n”;
return 0;
}
well I tried to code the answer but I get an error here we go:

Code: [Select]

#include <iostream>

struct barsnames
{
    char candyname[20];
    float weight;
    int calories;
};
int main()
{
    using namespace std;
    barsnames hi[2] =
    {
              {"snack",0},
              {"weight",2.3,0}
              {"calories",350}
};
cout << "CandyName: " << hi[0].candyname << " , weight: " << hi[1].weight << " , calories: " << hi[2].calories;
cout << endl;
    system("pause");
    return 0;
}

look at :

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{"snack",0},
              {"weight",2.3,0}
              {"calories",350}I think that I did something wrong there it should look like this:

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{"snack",here comes something},
              {"2.3",her comes something}
              {"350",here comes something}
well from the book we have got this:

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inflatable guests[2] = // initializing an array of structs
{
{“Bambi”, 0.5, 21.99}, // first structure in array
{“Godzilla”, 2000, 565.99} // next structure in array
};
Idk what are those numbers but I doubt that are something related with memory store

[gh0st]

Satan look what Ive found this is probably the answer to my question:

Code: [Select]

#include <iostream>

struct barsnames
{
    char candyname[20];
    float weight;
    int calories;
};
int main()
{
    using namespace std;
    barsnames hi[3] =
    {
              {"snack"},
              {"weight",2.3},
              {"calories",350}
};
cout << "CandyName: " << hi[1].candyname << " , weight: " << hi[2].weight << " , calories: " << hi[3].calories;
cout << endl;
    system("pause");
    return 0;
}

I knew it that part is something related with the memory I know that thats not the answer but at least I get an output but I still dont underestanding how this statement works so If someone could help me plz I would be really grateful

[Satan911]

It's that simple:

Code: [Select]

#include <string>
#include <iostream>

using namespace std;

struct barsnames
{
    string candyname;
    float weight;
    int calories;
};

int main()
{

   barsnames *barsnames_ptr = new barsnames[3];
   
   barsnames_ptr[0].candyname = "Oh Henry";
   barsnames_ptr[0].weight = 2.0;
   barsnames_ptr[0].calories = 200;

   barsnames_ptr[1].candyname = "Caramilk";
   barsnames_ptr[1].weight = 2.5;
   barsnames_ptr[1].calories = 400;

   barsnames_ptr[2].candyname = "Mr.Big";
   barsnames_ptr[2].weight = 3.0;
   barsnames_ptr[2].calories = 500;
   
   for(int i=0; i<3; i++)
   {
      cout  << "Candy" << i+1 << " name: "     << barsnames_ptr[i].candyname << endl
            << "Candy" << i+1 << " weight: "   << barsnames_ptr[i].weight    << endl
            << "Candy" << i+1 << " calories: " << barsnames_ptr[i].calories  << endl << endl;
   }

   delete [] barsnames_ptr;

   return 0;
}

I took the liberty to change the char to a string because I don't see why you would use a char anyway.

[gh0st]

thank you very much Satan +1 for you