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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);
How to write an inline class member function In addition to global functions, you may request that non-static member functions of a class be inlined. The normal method of doin
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 tw
The project is to design and write a C++11/FLTKgame program with a graphical user interface.The game is based on "pancake sorting," as described at http://en.wikipedia.org/wiki/P
Program to print character array : Write a program to print the character array by using string class functions. void main() { char line[30]; int i=0; clrsc
Raj is a newbie to the programming and while learning the programming language he came to know the following rules: · Each program must start with ''{'' and end with ''}''
your own wise
how to program?
smugglers are becoming very smart day by day. Now they have developed a new technique of sending their messages from one smuggler to another. In their new technology, they are send
Create a class called ticketSelling that stores booking information of a single performance on a single day and sells the tickets of the performance. The class should include at
Problem Statement: You have to write a C program to develop a Car Parking Management System for a busy commercial area. The system will record the car plate number, date and time w
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