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I understand from your impressive example that summating a large population of real numbers in different ways, will result in different outcomes, whereas if you do exactly the same, but with double pr ...

Bingo. Thank you. Though my do-what requirement re this issue is limited, since I will only attempt financial applications, the absence of do-why teases.

program test
double precision::amount
amount = 1234567.25
write(*,100)amount
100 format(F13.2)
end program test

Up until seven positions before the decimal point, the decimals (cents) are nice ...

The texts on precision make my head spin. Please, how do I declare a variable that has max 8 number positions before the decimal point and two after, plus additional positions for obligatory .'s and , ...

Thank you, I will try what you say. Zach.

program test_trim
character(len=30)::test
test = " nuts"
print *,'X',trim(test)
end

In the posted text there were a lot of spaces before "nuts" however, ...

I had already amended my response. Thank you again. I wasn't yet sensitised to seeing 'whatever' rather than whatever so I will pay better attention in future. Yes, they are character strings.

Thank you Bill for "If any of the 4 integers are greater than 999", etc !

Thank you for the program you responded with and the explanation contained.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1. So from you I learn that:
4(2x,I3) pertains to four integers, each preceded by two spaces
Now re (6,'4(2x,I3)') what does the "6" stand for?
~~~ ...

Re: format ( 4(2x,I3) )

I would like to know what the format ( 4(2x,I3) ) specifies.
Please only reply with a code example employing the format ( 4(2x,I3) ).
Please do not respond with a narrativ ...

Thank you for your help. I have ordered a textbook and am putting everything on hold until I have done some necessary studying.

Yes I need a book. You are right. Learning from the Net has its limitations. I already have one on order. I don't have more than two decimals output in a financial program. So how many positions befor ...

Re your code, for which I thank you, in a financial application I wouldn't end up with values that have d0 at the end. Could you propose an example without that d0 at the end? Indeed the numbers could ...

What would be the format string for a real, maximum positions before the decimal point: thirteen and two positions after the decimal point? What I am really after is displaying a financial number with ...