Thread: efficient array

Code:

	fIn2.get(xCh[1]);
	fIn2.get(xCh[0]);
	fIn2.get(xCh[3]);
	fIn2.get(xCh[2]);

	fout.write(xCh,4);

Just posting this to demonstrate using a for loop to access an array (you'll do this lots in the future)

Code:

for(int i=0; i<4;i ++)
{
	fIn2.get(xCh[i]);
}

	fout.put(xCh[1]);
	fout.put(xCh[0]);
	fout.put(xCh[3]);
	fout.put(xCh[2]);

I would definitely rather never use put or get. You make WAAAY more function calls that way and a single disk access is much better than 100 disk accesses. Disk access can be one of the slowest things you can do. Now, I will admit that fstream does buffering so it isn't as bad as I'm making it, however you still make more function calls that way. So an even better way to do this would be to read the entire buffer in and write the entire buffer out. Like so:

Code:

           char buf[4];
           fIn2.read(buf,4);
           xCh[0] = buf[1];
           xCh[1] = buf[0];
           xCh[2] = buf[3];
           xCh[3] = buf[2];
           fout.write(xCh,4);