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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);
A: No. If they're utilized properly, they increase encapsulation. You frequently require splitting a class in half while the two halves will have distinct numbers of instances o
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Project Description: Need someone to prepare a trading platform and sophisticated trading strategy. Must have knowledge and experience in most of these: QuickFIX, Esper, Quan
Identify 2 to 3 existing algorithms commonly used for object tracking. Algorithms should be in C or written in MATLAB language. Document these algorithms in flowcharts and run thes
how would land elevation have changed if Coronado had traveled 150 miles due west from what is today Arizona instead of east toward New Mexico
/* THIS PROGRAM IS TO ASK USER TO INPUT TWO DATE & PRODUCE A NEW DATE */ #include #include struct date { int dd; int yy; int mm; }; date add(date d1,date d2) {
Use the program called harris-shell.c and add some code to find the corners in the image checkers.jpg. You should say that a pixel in the image is a corner if it passes the given t
Byteland county is very famous for luminous jewels. Luminous jewels are used in making beautiful necklaces. A necklace consists of various luminous jewels of particular colour. Nec
Threaded binary tree: Consider the linked illustration of a binary tree 'T. Approximately half of the entries is the pointer fields 'LEFT' and 'RIGHT' will have null elements. Th
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