How to use a variable in format statement in Fortran?

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SUMMARY

The discussion centers on using a variable in a FORMAT statement in Fortran, specifically with the gcc-3.4.6 compiler. The user attempts to print a greeting with a dynamic length determined by the variable 'I' but encounters limitations due to the lack of support for variable format specifiers in the compiler. The output demonstrates the incremental display of the greeting, but the desired functionality cannot be achieved as variable format specifiers are not part of the Fortran standard supported by gcc.

PREREQUISITES
  • Understanding of Fortran programming language syntax
  • Familiarity with FORMAT statements in Fortran
  • Basic knowledge of the gcc compiler and its versions
  • Awareness of Fortran standards and limitations
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  • Research alternative methods for dynamic string manipulation in Fortran
  • Explore the use of character arrays and substring functions in Fortran
  • Learn about the capabilities of newer Fortran compilers that support variable format specifiers
  • Investigate the differences between Fortran standards regarding FORMAT statements
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Fortran developers, programmers working with gcc compilers, and anyone looking to understand the limitations of FORMAT statements in Fortran.

manugv
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hello everyone!
I was do programming in fortran and i wanted to print my answer in the format below. I was not able to do it. I have written a part of my program also.
i.e,
#####
greeting = 'Good Morning!'
do 110 I = 1, 12
write (*,115) (greeting)
115 format (A<I>)
110 continue
end
#####
here i want to use a variable 'I' in the format statement i tried it doing but i failed. so please if anyone knows to use a variable in format statement tell me.
I use gcc-3.4.6 compiler.

output of the program
G
Go
Goo
Good
Good
Good M
Good Mo
Good Mor
Good Morn
Good Morni
Good Mornin
Good Morning
 
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