input data file

input data file

i wanna input data which is txt or dat file. i dont do this. i saw a few example in internet but i dont this. 

in instance input data  file

1 25

2 33

3 37

4 45

how fortran can  read this data do you know, help me

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You're asking a very basic question that is covered in many books and also, many tutorials on the web.  I suggest you start with the Fortran Wiki page - - which gives tons of useful information and links on all aspects of Fortran including file input and output.

i know very basic question  otherwise i search but i didnt do

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