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Are there upper and lowercase letters in fortran 90?


Asked by Dahlia Dougherty on Dec 03, 2021 FAQ



Indentation is essential to keep a program readable. Additionally, empty lines are allowed and can help to make the program readable. Fortran 90 allows both upper and lowercase letters (unlike FORTRAN 77, in which only uppercase was allowed). 2. Types, Variables, Constants, Operators Names in Fortran 90
Also,
Originally, all Fortran programs had to be written in all upper-case letters. Most people now write lower-case since this is more legible, and so will we. You may wish to mix case, but Fortran is not case-sensitive, so "X" and "x" are the same variable.
Consequently, A Fortran 90 identifier can have no more than 31characters. The first one must be a letter.The remaining
Just so,
Fortran 90 supports two forms of source code; the old Fortran 77 source code form (now called fixed form), and the new free form. Using free source form, columns are no longer reserved and so Fortran statements can now appear anywher e on a source line. The source line may contain up to 132 characters.
Besides,
Fortran programs begin with the PROGRAM keyword, followed, optionally, by a name for the program. The end of the program should also be marked by END PROGRAM. PROGRAM MyProgram ! Do some stuff here END PROGRAM MyProgram