Efficient File Name Changes: How to Automate the Process with Programming

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n1person
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Hello all,

I have another little computer problem to deal with. I have a folder full of files (over a thousand) with the basic form KJ(number)-j(another number).txt, and I want to change the style to (number)(another number).txt. Is there any simple way to do this as the only way I can think of is a program which opens the file, opens a new file, copies the contents from the open file to the new file, and closes the two files, which seems timely and rather inefficient.

Thanks for your help!
 

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There is also the more general problem of turning (2 random letters)(number)-(2 other random letters)(another number).txt --> (number)(another number).txt
 
<io.h> or <stdio.h>

int rename(
const char *oldname,
const char *newname
);

Such things can be located just by googling.