Format for Reading in Real Numbers

[scftw7]

Hi,

I'm trying to read in from a text file the following sequence

100 A B -5585577.906775479

I've tried reading it using the following format:
10 FORMAT(I3,1X,A1,1X,A1,1X,F10.10)

and writing it using the following command:
READ(2,10) A,B,C,D
WRITE(*,10) A,B,C,D

However, upon output, it gives the following:


100 A B **********

Why is it doing this? Thank you

 

[xwb]

Because your floating point format is incorrect. It should be F20.10. Alternatively, use G format G20.10.

 

[scftw7]

Okay, I tried F20.10, and it printed out the following:

318772740 A E -5585578.0000000000 ********** **********

It can't seem to read in the digits to the right of the decimal point.

 

[scftw7]

Sorry, for the example above, it printed the following:

100 A B -5585578.0000000000

 

[FJacq]

It can't seem to read in the digits to the right of the decimal point.

because the variable D has certainly been declared REAL (this is the default). A real variable is usually a 32bit value which corresponds to a maximum of 7 significant digits. Try DOUBLE PRECISION instead...

François Jacq

 

[GerritGroot]

Wouldn't it be easier to read without format?

 

[scftw7]

Thanks, the double precision did the trick