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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);
data structure ?
Write a main program that uses these system calls to echo the typed characters. The pseudo code will look something like: void traphandler () { if (R0 == 0) { // read sys
c++ program about youngs doubleslit experiment
Using Figure 10.2 as a model, illustrate the result of each operation in the sequence ENQUEUE.Q; 4/, ENQUEUE.Q; 1/, ENQUEUE.Q; 3/, DEQUEUE.Q/, ENQUEUE.Q; 8/, and DEQUEUE.Q/ on an i
C program to show overloading of matrix operator: Write a program for matrix operator overloading. class matrix{ private : int x[
Conversion Functions Conversion functions are member functions used for the following purposes: 1. Conversion of object to basic data type. 2. Conversion of basic data ty
Differences between a pointer and a reference 1. A reference must always point to some object where as this restriction is not imposed on a pointer. e.g. int *pi = 0;
Constructors and Destructors: A Class is defined as constructor by declaring a constructor in the form of function inside the class. In other word a function in the name of
Project Description: I want someone who can post ads for me on Craiglist . I will pay 3$ per ad i need about 30-40 ads per day . Skills required: C Programming, MySQL, Jav
The for Loop For loop is the controlled form of loop. The general format of this : for( initialize ; test ; update) { statements;
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