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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);
I need Asp .net Facebook app project completion Project Description: We are urgently seeking a few remaining items to be completed, and the project to be deployed to live.
Classify computer systems according to capacity. How they are different from computers according to the classification of technology. Provide comparative study also.
one programming exampale
replace character into string and return value of string that are replaced
Illustration of Grid function: For illustration, the script below creates two individual figure windows. At First, it clears the figure window. Then, it generates an x vector
In order to override a method, a subclass of the class which originally declared the method have to declare a method along with the same name, return type (or a subclass of that re
Program to find a Greatest String: C - Program: Write a program find largest string by c program. int main( int argc, char *argv[] ) { if( argc {
Define the Meaning of Call by reference? In "call-by- reference", as an alternative of passing the value of a variable, the location number (or the address) of the variable is
i want software to calculate heating or use thermodynamic equation , pleas help me
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 betw
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