Save and Read struct help? binary file

[s123456]

here is my code:

/////////////////////////////////////////////struct

#include <iostream>
#include <string>
#include <fstream>
using namespace std;
struct Cat
{
char name[20];
int age;


};
//////////////////////////////////////////////////////////////



#include <iostream>
#include <string>
#include <fstream>
#include <iomanip>
using namespace std;
#include "Cat.h";



int main()
{
Cat yourCat;
int NumStructs;

int num = 3;
int count = 0;

fstream file;

cout << "Enter 3 cat records.\n";

file.open("f:\\critters.bin", ios:ut | ios::binary);

for(int i = 0; i < 3; i++)
{
cout << "Enter information about a cat:\n";
cout << "NAME: ";
cin >> yourCat.name;
cout << "AGE: ";
cin >> yourCat.age;
file.write(reinterpret_cast<char*>(&yourCat), sizeof(struct Cat));
}

cout << "Record written to file.\n";
file.close();

cout << "\n\nEnter one more cat\n";
file.open("f:\\critters.bin", ios::app);
if (file.fail()) {
cerr << "Unable to open file for writing." << endl;
exit(1);
}

cout << "NAME: ";
cin >> yourCat.name;
cout << "AGE: ";
cin >> yourCat.age;
file.write(reinterpret_cast<char*>(&yourCat), sizeof(struct Cat));
file.close();

cout << "\n\nHere is a list of all cats:\n";



file.read(reinterpret_cast<char*>(&yourCat), sizeof(struct Cat));
for(int i = 0; i< 4;i++)
cout << setw(10) << left << yourCat.name <<endl;
cout << yourCat.age <<endl;
file.close();



system("pause");
return 0;
}

////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////
//////////////////////////////////
.



I NEED HELP WITH THIS:


file.read(reinterpret_cast<char*>(&yourCat), sizeof(struct Cat));
for(int i = 0; i< 4;i++)
cout << setw(10) << left << yourCat.name <<endl;
cout << yourCat.age <<endl;
file.close();





//// i want to display all four records ...example:
Here is a list of all cats:
Tom 5
Fluffy 3
Sally 4
Sam 2

[VictorN]

I NEED HELP WITH THIS:

file.read(reinterpret_cast<char*>(&yourCat), sizeof(struct Cat));
for(int i = 0; i< 4;i++)
cout << setw(10) << left << yourCat.name <<endl;
cout << yourCat.age <<endl;
file.close();


//// i want to display all four records ...example:
Here is a list of all cats:
Tom 5
Fluffy 3
Sally 4
Sam 2

1. Your for loop consists only of one statement

   for(int i = 0; i< 4;i++)
     cout << setw(10) << left << yourCat.name <<endl;

   It is because you do not use the braces!
2. If you "want to display all four records" then you have put the read statement inside the loop.

[s123456]

like this?


for(int i = 0; i< 4;i++)
{ cout << file.read(reinterpret_cast<char*>(&yourCat), sizeof(struct Cat));
cout << setw(10) << left << yourCat.name << "\t";
cout << yourCat.age <<endl;
}

file.close();

//===========================OUTPUT==============================
Enter 3 cat records.
Enter information about a cat:
NAME: a
AGE: 1
Enter information about a cat:
NAME: b
AGE: 2
Enter information about a cat:
NAME: c
AGE: 3
Record written to file.


Enter one more cat
NAME: d
AGE: 4


Here is a list of all cats:
00000000d 4
00000000d 4
00000000d 4
00000000d 4
Press any key to continue . . .

[VictorN]

like this?

	for(int i = 0; i< 4;i++)
		{	cout << file.read(reinterpret_cast<char*>(&yourCat), sizeof(struct Cat));
			cout << setw(10) << left << yourCat.name << "\t";
			cout << yourCat.age <<endl;
		}

1. What this highlighted "statement" could mean?
2. Please, use Code tags while posting code snippets!

[s123456]

You said to put the read statement inside the loop ...it didn't work...so I need help making it work

[VictorN]

You said to put the read statement inside the loop ...it didn't work...so I need help making it work

But I never said that you should pass in the return value of read(...) to cout!

	for(int i = 0; i< 4;i++)
	{	
		file.read(reinterpret_cast<char*>(&yourCat), sizeof(struct Cat));
		cout << setw(10) << left << yourCat.name << "\t";
		cout << yourCat.age <<endl;
	}

Besides, you must open this file for reading before trying to read anything!

[s123456]

file.open("f:\\critters.bin", ios::in | ios::binary);

file.read(reinterpret_cast<char*>(&yourCat), sizeof(struct Cat));
for(int i = 0; i< 4;i++)
{ cout << setw(10) << left << yourCat.name <<endl;
cout << yourCat.age <<endl;
}
file.close();



can you please help me create the code i am completely lost

[VictorN]

can you please help me create the code i am completely lost

It is what I tried in all my posts in this thread, however you have almost completely ignored what I wrote!