Page 287 - DCAP404 _Object Oriented Programming
P. 287
Object-oriented Programming
Notes Let us write a program that uses get() and put() functions for binary files.
#include <fstream.h>
void main()
{
fstream myfile(“data.dat”,ios::out | ios::in | ios::binary);
//open file in binary mode
char ch;
ch=’A’;
myfile.put(ch); //put the content of ch to the file
myfile.seekg(ios::beg); //go to the beginning of the file
myfile.get(ch); //read one character
cout << ch << endl; //display it on console
myfile.close();
}
The following program uses read() and write() functions for binary file manipulations.
#include <fstream.h>
#include <string.h>
void main()
{
fstream myfile(“data.dat”,ios::out | ios::in | ios::binary);
char Carray[13];
strcpy(Carray,”C++ Programming”); //put the string into the
character array
myfile.write(Carray,5); //put the first 5 characters “C++ P”
into the file
myfile.seekg(ios::beg); //go to the beginning of the file
static char Rarray[10]; //To store read data
myfile.read(Rarray,3); //read the first 3 characters- “C++”
cout << Rarray << endl; //display them on console
myfile.close(); //close file
}
Task
1. A file in open state file has two pointers associated with it. What are they?
2. Please quote two methods of opening a data file in a program.
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