Write a program to updating random access file

The ostream member function write outputs a fixed number of bytes, beginning at a specific location in memory, to the specified stream. When the stream is associated with a file, function write writes the data at the location in the file specified by the "put" file-position pointer. The istream member function read inputs a fixed number of bytes from the specified stream to an area in memory beginning at a specified address. If the stream is associated with a file, function read inputs bytes at the location in the file specified by the "get" file-position pointer. As we will see, istream function read can subsequently be used to read the four bytes back into integer variable number.
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Random-Access Files

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effetticollaterali.infoAccessFile Class Method | Set 1 - GeeksforGeeks

The following example creates a text file called Out. If you type out the resulting file you will see that file comes out as H e l l o with a gap between each letter. I suspect this is because a character is 16 bits and because ASCII is 8 bit, the upper 8 bits result in a blank character. This allows human readable chars to be written.
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Apart from the simplest of applications, most programs have to read or write files. It may be just for reading a config file, or a text parser or something more sophisticated. This tutorial focuses on using random access files in C. The basic file operations are:.
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As I searched JavaWorld 's site for ideas for this month's Step by Step , I came across only a few articles covering low-level file access. Although high-level APIs such as JDBC give us the flexibility and power needed in large enterprise applications, many smaller applications require a more simple and elegant solution. In this article, we will build an extension to the RandomAccessFile class that allows us to store and retrieve records. This "records file" will be equivalent to a persistent hashtable, allowing keyed objects to be stored and retrieved from file storage.
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