Re: [Dev-C++] Const member in a Struct

[Jonathan W. <jon...@gm...>]

Hi,

You are making a mistake when you try to declare all your structs :

for (i=3D1;i < 5;++i) {
  struct elements{
    string name;
    int atomic_no;
    float atomic_weight;
  } i;
}

This will not declare 5 structs, called '1' through '5', but all called 'i'=
.
 They will also be local to the inside of the loop: at the ed of each
iteration of the loop thez will be destroyed.

Therfore these references to the structs are invalid

1.name =3D "hydrogen";
1.atomic_no =3D 1;
1.atomic_weight =3D 1.007794;
2.name =3D "helium";
2.atomic_no =3D 2;
2.atomic_weight =3D 4;
3.name =3D "lithium";
3.atomic_no =3D 3;
3.atomic_weight =3D 6.941;
4.name =3D "berylium";
4.atomic_no =3D 4;
4.atomic_weight =3D 9.012182;
5.name =3D"boron";
5.atomic_no =3D 5;
5.atomic_weight =3D 10.811;


string element;
string title("\n\t You have selected :\t");
string no("\n\t The atomic number for ");
string is(" is:\t");
string wgt("\n\t The atomic weight is:\t");
printf ("\t The Begining of the Periodic Table of the Elements \n");
printf ("\t In the hopes of learning C programming and elemental values.
\n\n\n");
do {
cout << "\n\t Please enter an Element you would like to examine : " ;
cin >> element;

if (element =3D=3D 1.name) {

cout << title << 1.name;
cout << no << 1.name << is << 1.atomic_no;
cout << wgt << 1.atomic_weight;
}

else if (element =3D=3D 2.name) {

cout << title << 2.name;
cout << no << 2.name << is << 2.atomic_no;
cout << wgt << 2.atomic_weight;
}

else if (element =3D=3D 3.name) {

cout << title << 3.name;
cout << no << 3.name << is << 3.atomic_no;
cout << wgt << 3.atomic_weight;}

else if (element =3D=3D 3.name) {

cout << title << 3.name;
cout << no << 3.name << is << 3.atomic_no;
cout << wgt << 3.atomic_weight ;}

else if (element =3D=3D 4.name) {

cout << title << 4.name;
cout << no << 4.name << is << 4.atomic_no;
cout << wgt << 4.atomic_weight;}

else if (element =3D=3D 5.name) {

cout << title << 5.name;
cout << no << 5.name << is << 5.atomic_no;
cout << wgt << 5.atomic_weight;}

cout << "\n\n\t Again Yes/No :";
cin >> x;}
while (!strcmp(x,"yes")) ;

}





On 7/28/07, J Hall <jsh...@ho...> wrote:
>
> Here is a program that I have been working on.
> when I compile, i get an invalid suffix on floating const error on all th=
e
> elements of the members of struct elements.
> Is this the type of situation that a pointer would help?
> It seems that since the periodic table has numbers 1-112, I ought to be
> able to write a loop
> that gives the struct elements the members 1-112 ,
> any ideas?
>
>
>
>
>
>
> using namespace std;
> int i,e;
>
> char x[3];
> main()
>
> {for (i=3D1;i < 5;++i) {
>        struct elements{
>        string name;
>        int atomic_no;
>        float atomic_weight;
>        }i;
>        }
>       1.name =3D "hydrogen";
>      1.atomic_no =3D 1;
>      1.atomic_weight =3D 1.007794 ;
>      2.name =3D "helium";
>      2.atomic_no =3D 2;
>      2.atomic_weight =3D 4;
>      3.name =3D "lithium";
>      3.atomic_no =3D 3;
>      3.atomic_weight =3D 6.941;
>      4.name =3D "berylium";
>      4.atomic_no =3D 4;
>      4.atomic_weight =3D 9.012182;
>      5.name =3D"boron";
>      5.atomic_no =3D 5;
>      5.atomic_weight =3D 10.811;
>
>
>  string element;
>  string title("\n\t You have selected :\t");
>  string no("\n\t The atomic number for ");
>  string is(" is:\t");
>  string wgt("\n\t The atomic weight is:\t");
> printf ("\t The Begining of the Periodic Table of the Elements \n");
> printf ("\t In the hopes of learning C programming and elemental values.
> \n\n\n");
>  do {
> cout << "\n\t Please enter an Element you would like to examine : " ;
> cin >> element;
>
> if (element =3D=3D 1.name) {
>
>             cout << title << 1.name;
>             cout << no << 1.name << is << 1.atomic_no;
>             cout << wgt << 1.atomic_weight;
>       }
>
> else if (element =3D=3D 2.name) {
>
>             cout << title << 2.name;
>             cout << no << 2.name << is << 2.atomic_no;
>             cout << wgt << 2.atomic_weight;
>       }
>
> else if (element =3D=3D 3.name) {
>
>             cout << title << 3.name;
>             cout << no << 3.name << is << 3.atomic_no;
>             cout << wgt << 3.atomic_weight;}
>
> else if (element =3D=3D 3.name) {
>
>             cout << title << 3.name;
>             cout << no << 3.name << is << 3.atomic_no;
>             cout << wgt << 3.atomic_weight;}
>
> else if (element =3D=3D 4.name) {
>
>             cout << title << 4.name;
>             cout << no << 4.name << is << 4.atomic_no;
>             cout << wgt << 4.atomic_weight;}
>
> else if (element =3D=3D 5.name) {
>
>             cout << title << 5.name;
>             cout << no << 5.name << is << 5.atomic_no;
>             cout << wgt << 5.atomic_weight;}
>
> cout << "\n\n\t Again Yes/No :";
> cin >> x;}
> while (!strcmp(x,"yes")) ;
>
>
>
> }
>
>
>
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<Morpheus> linux, c'est une question de VI ou de MORE