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Editorial Team
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Asked: 2026-05-26T07:20:20+00:00

i am writing a fortran code,which displays current value of variable.If user wants to

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i am writing a fortran code,which displays current value of variable.If user wants to retain the current then he simply press enter,else he will enter new string.

my question is,while reading a new string,I want to display >< and cursor should come in between these characters,so that if he enters even space, it would be visible to him

EG:

  WRITE(*,*)'Current value is 'curVal

in next line statement to read new character.
As i am new to fortran,I think in read statement we can enter only variales,not formatting.

EG:

   READ(*,*)curVal

but not Read(,)’>’,curval,'<‘

i want to display like second statemnt.Could you tell me how to deal with read in this case??

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1 Answer

  1. Editorial Team

    I think that this is a level of terminal IO control not provided / guaranteed by the Fortran language. You can do something like the following to provide convenient input that can retain the current value by simply hitting the Return/Enter key:

    write (*, '( "Input new value, or press Enter to retain", I0, ". Input: " )', advance="no") current_value
read (*, '(A)' ) string
if (len_trim(string) == 0 ) then
   new_value = current_value
else
   read (string, *) new_value
end if
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