C / C++ / MFC

#include 
#include 
#include <fcntl.h>
#include <stdio.h>

int main(int argc, char * argv[])
{
	//our file references and read and write counts
	int fileread, filewrite;
	ssize_t nread, nwrite;

	if(argc == 1){
		printf("Error: hw3 <buffersize>");
		return 1;
	}

	//our buffer size is determined by the user
	char buff[ (int)argv[2] ];

	// open 128kB file for reading
	// create if it doesn't exist copy.bmp for writing
	fileread = open("128kB.bmp", O_RDONLY);
	filewrite = creat("copy.bmp", O_WRONLY);

	//copy all of the contents of the file	
	while(1)
	{
		//read data from the input file and place in the buffer
		nread = read(fileread, buff, sizeof(buff) );

		//if no information left to read, exit while loop
		if (nread == 0) break;

		//write the data from the buffer into the output file
		nwrite = write(filewrite, buff, sizeof(buff) - 1 );
	}

	//close the files
	close(fileread);
	close(filewrite);

	return 0;
}</buffersize></stdio.h></fcntl.h>