Question

HW_6d - Write a struct object to a binary file.

1. Create a new C++ project and name it as:   Cats

1. Create a Source.cpp file.

1. Declare a struct named Cat. (in the Source.cpp file, or in a separate header file)

1. Each Cat object has a name and age.

• The name data member is a c_string.
• The age data member is an integer.

1. Ask the user to enter 3 cats.

1. Use a while loop to read the information about one cat entered by the user, and write it to a

          binary file named: critters.bin

• Only one Cat object needs to be declared, because the same object can be used for

     each cat.

• Use the write() function to write the data to a binary file.
• The while loop should only execute 3 iterations.

1. Once the file has been written, the following message should be displayed:

      Record written to file.      (see output)

1. Turn in a screen print of the binary file, as shown below, along with your code and output.

/* OUTPUT

Enter 3 cat records.

Enter information about a cat:

NAME: Tom

AGE: 5

Enter information about a cat:

NAME: Fluffy

AGE: 3

Enter information about a cat:

NAME: Sweet Pea

AGE: 2

Record written to file.

Press any key to continue . . . */

Please make the code based on C++, and make a description for each code.

Answer 1

C++ code:

#include<iostream>
#include<cstring>
#include<fstream>
using namespace std;

//Defining the struct
struct Cat{
        string name;
        int age;
}c[3];                   //One structure object to contain 3 cats

int main(){
        
        ofstream wf("critters.bin", ios::out | ios::binary);  //opening the file in output mode
        
        if(!wf) {
      cout << "Cannot open file!" << endl;
      return 1;
        }
        
        cout<<"Enter 3 cat records."<<endl;
        
        //taking values from user
        int i = 0;
        while(i<3){                                  
                cout << "Enter information about a cat: "<< endl;
                cout << "NAME: ";
                cin >> c[i].name;
                cout << "AGE: ";
                cin >> c[i].age;
                wf.write((char *) &c[i], sizeof(Cat)); //writing struct object to binary file
                i++;
        }
        cout<<"Record written to file"<<endl;
        wf.close();
        return 0;
}

OUTPUT:

Binary file: