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

Boardcoloring, In this problem you are given a board in which some of the e...

In this problem you are given a board in which some of the elements are placed as shown in diagram below. Each element represents a color. Fill the other elements in the board, suc

Minimum shelves, write a c++ program, that finds the minimum total number o...

write a c++ program, that finds the minimum total number of shelves, including the initial one, required for this loading process.

Client server using c, (a) client server or multithreaded client-server, wh...

(a) client server or multithreaded client-server, where server will create pool of worker threads (say 5) to provide services to pool of clients (say 5 ).Server should be behaving

C++, Write a program to find the area under the curve y = f(x) between x = ...

Write a program to find the area under the curve y = f(x) between x = a and x = b, integrate y = f(x) between the limits of a and b. The area under a curve between two points can b

Call by reference, Call by reference: Arguments to a function can be pa...

Call by reference: Arguments to a function can be passed in two way; one by call by value and other by call by reference.  Call by value is passed either through a constant

Find area under curve, write a c program to find the area under the curve4...

write a c program to find the area under the curve4 f=(x) between x=a and x=l integrate y=(x) between the limits of a and b Solution: #include float    start_point,

C/c++ program, luminous jewel polishing necklace,c/c++ programming

luminous jewel polishing necklace,c/c++ programming

Explain static variables, Static Variables Static variables have the si...

Static Variables Static variables have the similar scope s automatic variables, but, unlike automatic variables, static variables retain their values over number of function ca

Explain redirection in c++?, Question 1 . Write a brief note on Aggregation...

Question 1 . Write a brief note on Aggregation Question 2 . Discuss briefly on constructors Question 3 . What are the important advantages of Inheritance? Question 4 .

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