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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);
Write a program that reads a line of characters from the user and displays that entire line after converting any uppercase characters to lowercase also change any lowercase charact
There are ''''n'''' ants on a ''''n+1'''' length rod. The ants are numbered from 1 to n and are initially placed at positions starting from position 1 till position n. They are mov
I have a Matlab assignment and I have the assignment description+ algorithm + and the output sample. the files are on a dropbox folder and you can download them from the link below
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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
I need a project on car rental system using c programming only of college level
I really have a hard time analyzing how to write a code in C. It''s all bout Time Departure and we must used a 24 hour clock. Can u help me?
Explain the working of Array with Strings? A string is defined in C language as an array of characters. A null character (‘\0') is automatically added to the end of the charact
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