Stream input and output functions, C/C++ Programming

Assignment Help:

  Within C we access external devices by means of a pointer i.e. address. The address could point to any memory mapped device i.e. Ram, Rom, Duart, Disk drives etc. Therefore there is no difference between accessing area in Ram or a file on a disk. However accessing devices usually require an initialization program, within C this is achieved by the fopen/fclose commands. The syntax of the fopen command is
 
    void main()
    {    
    FILE *name;
    name = fopen(device or file name , access);
 
    if (name == NULL ) 
    {
      printf("cannot open the file \n\r");
      exit(1);
    }
    }
 
The device or file name is usually machine dependent i.e.
 
    VMS    "dsk$usr:[en_staff.entjmc]file.ext"
    Unix    "dsk$usr:en_staff\entjmc\file.ext"
    Mac    "dskname:folder:folder:file";
    PC    "drive name:\directory\file.ext";
 
By default the current disk and directory are taken if not specified. The access describes the write/read privilege and type of data stored i.e. text or binary. Text is used to describe sequential data while binary is standard random access data
 
    "r"    Text file read only
    "w"    Create a new Text file write only
    "a"    Append to end of the text file
    "rb"    Binary file  read only
    "wb"    Binary file write only
    "ab"    Append to end of the binary file
    "r+"    Text file read and write 
    "w+"    Create a new text file for read and write
    "a+"    Append to end of the text file for read and write 
    "rb+"    Binary file read and write
    "wb+"    Create a binary file for read and write
    "ab+"    Append  to end of the binary file for read and write

For example to create a write access file called out.txt we use
 
    name = fopen("out.txt","w");
 
  i.e   file name  = out.txt
    access = create /write text file 
 
It is important to close all channels when finished; this is achieved by fclose i.e.
    
    fclose(name);


Related Discussions:- Stream input and output functions

Palindorme, program coding for the conversion of string to a palindrome

program coding for the conversion of string to a palindrome

Dynamic constructor, dynamic initialization of object using constructor in ...

dynamic initialization of object using constructor in C++

Using the substitution model illustrate the process, Each of the following ...

Each of the following two procedures defines a method for adding two positive integers in terms of the procedures inc, which increments its argument by 1, and dec, which decrements

Credit Card Validation Check digit, Use 16 digit credit card numbers that c...

Use 16 digit credit card numbers that contain 15 digits an 1 check digit. The format of the card number consists of the 15 digits followed by the check digit. The check digit is co

#palindrome, replace character into string and return value of string that ...

replace character into string and return value of string that are replaced

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd