Like many other languages, the words which make up the Fortran language are called reserved words and cannot be used as names of variables. Variable names in Fortran consist of the letters A-Z, the digits 0-9 and the underscore ( _). Keep reading this post to know the main points of Abaqus Fortran subroutine writing.
Also, we may use digits (using 2 for the second line, 3 for the third, and so on). Example: C THE NEXT STATEMENT GOES OVER TWO PHYSICAL LINESĪny character can be used instead of the plus sign ( +) as a continuation character. One can then break the statement into two or more lines and use the continuation mark in position 6 (I mean, you put 5 spaces and then type +). Sometimes, a statement does not fit into the 66 available columns (7-72) of a single line. Loops Section (Do Loop) in the second part of this article ( Under Construction) to see a practical use of statement labels. The programmer is responsible for assigning a unique number to each label in each program (or subprogram). Typically, many loops and other statements in a single program require a statement label. Statement labels are used to mark positions in the program. This type of comment can be any place among your piece of code (look at ‘ ! THIS IS RADIUS OF THE CIRCLE’). You may also use the exclamation mark ( !) for comments. The lines that begin with a “ C” here are comments and have no purpose other than to make the program more readable. 6 Continuation of the previous line (optional) The most important rules are the column position rules: Column Position Rulesįortran has very few rules for how to format the source code. However, Fortran is not case-sensitive, so “X” and “x” are the same variable. Originally, all Fortran programs had to be written in all uppercase letters. READ (*,*) R ! THIS IS RADIUS OF THE CIRCLE Take a look at this simple piece of code: PROGRAM CIRCLE REAL R, AREAĬ THIS PROGRAM READS A REAL NUMBER R AND PRINTS C THE AREA OF A CIRCLE WITH RADIUS R.
BasicsĪ Fortran program is just a sequence of lines of text. Here is a handy package of almost all the things you will need… Enjoy this article to know Abaqus Fortran basics. Furthermore, you need to know only an even smaller subset of FORTRAN to write a subroutine code in Abaqus. Its syntax is also very similar to MATLAB. Start Writing an Abaqus Subroutine : Basics & Recommendationsįortran is one of the easiest programming languages to learn because it can do virtually nothing other than basic low-level operations common to all languages. If you are newer to Abaqus subroutine, you should start from here: In Abaqus, user subroutines are primarily written in Fortran, although developing your code in C or C++ is also possible.
0 kommentar(er)
