Write a program to swap odd and even bits in an unsigned integer with as few instructions as possible

E.g., bit 0 and bit 1 are swapped, bit 2 and bit 3 are swapped, etc...

Input Specifications

Your program must take a single command line argument; the name of a file. It must then open the file and read out the input data. Each line will contain an integer number e.g.

1234567
7654321
888

Output Specifications

Your output must consist of exactly same number of lines as input with the expected results to the standard output. Using the above example, the output should be:

2222411
12109682
948