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

Program to write c++ program, program to write superposition of waves using...

program to write superposition of waves using class and objects

Name the operators which cannot be overloaded?, Q: Name the operators which...

Q: Name the operators which cannot be overloaded? A:sizeof, ., .*, .->, ::, ?:

Write code in visual studio 2010, I have a mini project where I need to wri...

I have a mini project where I need to write a code .wonder if someone can help me.I already have the forms and webmaster page done just need to code portion

Structure of cpp program, Structure of C++ Program: Chronological orde...

Structure of C++ Program: Chronological order of C++ program. 1.   Class declaration 2.   Main function program 3.   Member functions definitions 4.   Include heade

Online tutor, Given an char variable last that has been initialized to a lo...

Given an char variable last that has been initialized to a lowercase letter, write a loop that displays all possible combinations of two letters in the range ''a'' through last. Th

Explain about evaluation of expression in c language, Explain about Evaluat...

Explain about Evaluation of Expression in c language? An Expressions are evaluated using an assignment statement of the form: variable = expression; The Variable is any v

Multiple constructor, Constructor public class ListNode {    //...

Constructor public class ListNode {    // package access members; List can access these directly private E data; // data for this node privateListNode nextNode; /

Struct items, how to make a program this struct items/product

how to make a program this struct items/product

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