Write a program to read a text file that calculates average values of all successive numbers and returns result to output file.

the last element in row has to be left intact

ex input file has matrix:

1 3 4 6

2 1 2 5

resulting matrix will be

(1+3)/2 (3+4)/2 (4+6)/2 6

3/2 3/2 7/2 5

which is:

2 3.5 5 6

1.5 1.5 3.5 5