Chapter 5: I/O files with C++ PDF

Chapter 5 I/O files Muluken W.  Outline The iostream Library Predefined Streams Manipulators Stream States Formatted I/O Reading & Writing files  Introduction File handling is an important part of all programs. Most of the applications will have their own...

Chapter 5 I/O files Muluken W.  Outline The iostream Library Predefined Streams Manipulators Stream States Formatted I/O Reading & Writing files  Introduction File handling is an important part of all programs. Most of the applications will have their own features to save some data to the local disk and read data from the disk again. Files which are on the secondary storage device are called physical files. In order to process file through program, logical file must be created on the RAM. Logical file is an object having file data type. An object should be a variable identifier that points to it. This variable is called file variable and sometimes also called file handler. C++ File I/O classes are file read/write operations for the programmer by providing easier to use classes. Con…  The iostream Library File streams in C++ are basically the libraries that are used in the due course of programming. The programmers generally use the iostream standard library in the C++ programming as it provides the cin and cout methods that are used for reading from the input and writing to the output respectively. In order to read and write from a file, the programmers are generally using the standard C++ library that is known as the fstream.  Con.. In Files we store data i.e. text or binary data permanently and use these data to read or write in the form of input output operations by transferring bytes of data. So we use the term File Streams/File handling. We use the header file ofstream: It represents output Stream and this is used for writing in files. ifstream: It represents input Stream and this is used for reading from files. fstream: It represents both output Stream and input Stream. So it can read from files and write to files. Operations in File Handling: Creating a file: open() Reading data: read() Writing new data: write() Closing a file: close()  Con… Let's see the simple example of reading from a text file testout.txt using C++ FileStream programming. #include #include using namespace std; int main () { ofstream filestream("testout.txt"); if (filestream.is_open()) { filestream