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We've combined our 45 years of producing award-winning Fortran language systems to deliver the most-productive, best-supported Fortran language system for the PC yet. To support the compilers, Lahey provides the sophisticated Visual Studio 2015 development environment with an unprecedented level of Fortran-intelligent features to dramatically improve programming productivity. Check out LF Fortran for a look at what real language support looks like! Whether you write new Fortran programs or maintain existing applications, you need instant information about program parameters, easy navigation to places of interest in your code, not to mention speed, dependability, and great tech support. You need LF Fortran! Download the full-featured free trial version now. LF Fortran v7.7 Professional Delivers!LF Fortran PRO includes the Lahey/Fujitsu Fortran 95 compiler, the 32/64 bit Lahey/GNU compiler and adds Microsoft's Visual Studio 2015 Shell with Lahey's exclusive Fortran Integration, the Winteracter Starter Kit, WiSK, for creating Windows GUIs and displaying graphics, Polyhedron's Automake utility, Fujitsu's WinFDB Windows debugger, the Coverage Analysis Tool that detects unexecuted code and performs range-of-operation checking, the Sampler Tool (an execution profiler) that helps tune program performance, Fujitsu's Visual Analyzer, the Fujitsu SSL2 math library (an extensive library and a proven performer on Fujitsu mainframes and workstations) and the Fujitsu and GNU C compilers.
New features in LF Professional v7.7
IEEE Standard 754 support
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IEEE Standard 754 defines the representation and behavior of 32- and 64-bit floating point numbers. IEEE 754 support provides for consistency of basic computational results among platforms that use IEEE 754. A heavy-duty online discussion of floating point numbers and the standard is provided by David Goldberg at http://docs.sun.com/source/806-3568/index.html. Visual Studio 2015 Shell with Lahey's exclusive Fortran SupportLahey's Visual Studio Fortran support is the most feature complete Visual Studio environment available. Our attitude is that the Fortran programmer deserves all the features and conveniences that the C# or Visual Basic programmer enjoys.
Project systemThe project is a basic building block that Visual Studio uses to create applications. A project will normally take a set of one or more source files and produce a compiled executable, but a project can also produce things like DLLs or static libraries, or do other sorts of processing. All the source files within a project are usually written in one programming language, and are compiled with one compiler. The Fortran support package provides several type of projects, and allows users of previous versions of Visual Studio to automatically upgrade their native Fortran projects to VS 2013. The Fortran project facility automatically scans all source files at build time and ensures all files are built in the proper order to satisfy module dependencies. Project templates On-line integrated helpThe VS Fortran support package provides documentation that is viewed using the Visual Studio help system. The comprehensive documentation covers the Fortran language, compiler usage, and explanations of the Fortran-smart Visual Studio editing features: Syntax coloringSyntax coloring provides the ability to differentiate code elements based on color. For example, a keyword may appear in blue, comments may appear in green, while character strings might be maroon. The Fortran language allows variables and procedures to have the same names as keywords, and this can pose a problem for colorizers that do not have a strong parsing ability. Since the parser used in the Lahey colorizer is derived from a Fortran compiler, it is unlikely that it would be confused by an identifier with the same name as a keyword. The support package allows the user to customize the colorizing scheme.Expandable codeExpandable code can make the chore of navigating through sections of code easier by allowing you to collapse a region of code into a single line. This feature works at the module and procedure levels by default, but the user has the ability to add new outlining regions, or to remove existing outlining regions.
A portion of the collapsed code can be viewed by hovering the mouse over the box containing the "...":  Method tips for intrinsic functionsParameter Info is a feature that helps the user write code by displaying information about intrinsic procedures as the user is typing. Parameter Info is currently implemented for all intrinsic procedures, and Lahey extensions supported by LGF.As a procedure invocation is typed, the open parenthesis character triggers the Parameter Info tooltip for the first argument: 
As typing continues, each succeeding comma character that is typed will trigger a tooltip for the next parameter: 
When a close parenthesis character is typed, the tooltip window is dismissed. The tooltip window is also dismissed whenever the cursor is moved outside of the area of the argument list. Quick info for local and global variablesQuick Info provides the user with information about variables and intrinsic procedures by displaying an informational tooltip window when the mouse is hovered over a name. Quick Info is currently implemented for all intrinsic procedures, Lahey extensions supported by LGF, and variables that are defined within the same project.
Block commenting and indentingBlock commenting is a feature that allows the user to quickly comment or uncomment selected blocks of code. Block indenting allows the user to change the indentation of a selected block of code. Both of these features work for code that is highlighted. If any portion of a line is highlighted, the feature works on the entire line. If there is no highlighted code, commenting or indenting will work on the single line where the cursor resides.The indenting rules and options you desire can be set within Visual Studio:  Parenthesis matchingParenthesis matching is a feature that locates a matching parenthesis and highlights the parenthesis pair. This feature can be quite useful when examining a complex statement. The following diagram shows a single multiline code statement with the matching parentheses highlighted with a light gray box: Block ReformattingBlock Reformatting is a free-format source code feature that allows the user to quickly reformat the current line, selected blocks of code, or the entire document. Reformatting is done by optionally highlighting a section of code, then choosing the Edit|Advanced|Reformat Selection menu option. You may select Format Document instead of Format Selection, and the entire document will be reformatted regardless of selection area. Indentation level can be controlled from the Visual Studio Tools|Options menu. If any portion of a line is highlighted, the feature works on the entire line. If there is no highlighted code, the single line where the cursor resides will be reformatted.The formatting rules and options you desire can be set within Visual Studio:  A section of code before reformatting:  And after:  Code CompletionCode Completion is a source code editor feature that assists rapid development by offering an alphabetical list of possible keywords, names, and code snippets that might be entered as code is typed into the editor. The list display is triggered by typing an alphabetic character at the beginning of a line, after whitespace, or after any symbol. If another character is typed, the list will be reduced to only those items that begin with that text.  Code SnippetsCode Snippets are a source code editor feature that assists rapid development by allowing pre-defined blocks of code to be easily inserted into the editor. Snippets are normally code that is often entered, such as IF constructs, FUNCTION definitions, and header comment blocks. Code Snippets can be inserted by selecting from the Code Completion list (press Tab after selecting), or by right-clicking and selecting "Insert Snippet...". When a Snippet is first inserted, the snippet-entry mode is activated. The names that are normally changed by the author will be highlighted fields. When the cursor is in a field, that field's text can be changed.  Press Tab to move to the next field. Press Enter when finished changing the fields, thereby terminating snippet-entry mode. It is possible for a Code Snippet to have no fields and not activate the snippet-entry mode. Collapsible RegionsUser-defined Collapsible Regions can make the chore of navigating through sections of source code easier by allowing you to collapse a region of code into a single line. The Fortran compiler treats these lines as comments. The region can then be collapsed by clicking on the minus symbol in the margin next to the !#region line. To expand the region, click the plus symbol in the margin. Once collapsed, you can hover the mouse over the [...] box to see the contents of the collapsed region:  Find All ReferencesFind All References is a feature that allows the user to display a list of all known references to a name within all of the source code in the Solution. It works in both the source code editor window, Class View and Object Browser. Right-click on a name in a Fortran code editor window to display a list of all known references to that name within the scope of the current cursor position. Right-clicking on anything other than a name will have no effect. Right-click on a item in the Member pane of Class View or Object Browser to display a list of all known references to that name within the Solution. The list will be displayed in the Find Symbol Results window. Double-click on a line in the list to open the source code file and jump to the position of that reference.Go To DeclarationGo To Declaration is a feature that allows you to jump to the declaration of a variable or procedure. This can be done by placing the mouse over the name you want to see the declaration for, right clicking and selecting "Go To Declaration" from the floating menu. The edit cursor will then jump to the line that contains the declaration for the name:  Navigation BarsUse the drop-down navigation bars above a Fortran code editor window to view or jump to a module or procedure definition within the code. The navigation bar on the left contains the Main Program and Modules defined in the source code file. Note that if a file contains subprogram(s) and no Main Program, "(MAIN)" will be displayed as a placeholder for the Main Program. The navigation bar on the right contains procedures defined in the source code file. Dimmed procedure names are out of scope for the current cursor position, but can still be selected.  Smart IndentingSmart Indenting is a free-format source code feature that allows the editor to indent the last line entered (terminated by the Enter key) as appropriate in relation to the previous line or the beginning statement of a code block. A code block consists of any statement that has a corresponding END statement.Building Projects and Viewing ErrorsTo build a Fortran project, select the "Build Solution" or "Rebuild Solution" option from the Build pull down menu. Alternatively, you can right-click on the project name in the Solution Explorer and select "Build" or "Rebuild" from the context menu that appears. The Error List window shows any build errors that occurred. Double-click on a message in the list to open the source code file and jump to the position where the error occurred. The current source code editor window will mark the location of build errors with a squiggly underline. Positioning the mouse pointer over the location of those markers will display the error in a Quick Tip.
Integrated DebuggerFortran programs can be debugged using Visual Studio, which hosts the command line debugger. The LG Fortran support package uses Visual Studio debugging interfaces to seamlessly integrate the command line debugger and enable the sophisticated Visual Studio debugging interface. This allows you to debug your Fortran program using the Visual Studio Debugging interface. While debugging, you can watch the values of variables change during program execution and set breakpoints with a mouse click. Using the VS debugging interface, you can run your program, set breakpoints, step a line at a time, view the values of variables in your program in several different ways, change the values of variables, and examine stack frames while running your program. The current executable line and any breakpoints are indicated with markers in the left margin of the source code display. If needed, the program will be rebuilt, the debugger will be started and the program will begin execution. When the program breaks execution, the execution pointer is displayed at the corresponding location in source code.
Locals displayTo examine all local variables within the scope of the current procedure, open the Debug menu and expand the "Windows" item. Select "Locals" from the "Windows" sub menu.
Watch WindowsTo watch a variable within the scope of the current procedure, open the Debug menu and select "QuickWatch". A dialog will appear that allows you to type the name of the variable you want to watch. If the name matches a valid variable in the program, it will be added to the watch list. To view a watch window, open the Debug menu and expand the "Windows" item. Select "Watch" from the "Windows" sub menu.
Quick Debugging InfoWhile debugging, variable values are added to the intellisense "Quick Info" display, which allows values to be examined by hovering the mouse over the variable in question.
Stack navigationWhen stopped at a breakpoint, stack frames can be examined using the "Call Stack" window:
By double clicking on a different stack frame, that frame is activated and variables within that frame can now be examined:
Class View and Object BrowserClass View displays the entity names defined in the application you are developing. You can open Class View from the View menu. There are two panes: an upper Objects pane and a lower Members pane. The Objects pane contains an expandable tree of names whose top-level nodes represent Projects. Expand a Project name in the Objects pane to list the Main Program and/or Modules defined within it. Variables, constants, procedures, TYPEs, INTERFACEs, and USEs for the selected Object are listed in the Members pane. Note that if a project contains subprogram(s) and no Main Program definition, a placeholder for the Main Program named "(MAIN)" will appear in the Objects pane. Right-click on an item in the Members pane to find all references of that name or to open files and navigate directly to the line where that name is defined. The Object Browser is similar to Class View but shows more information. It also displays the names defined in the application you are developing. You can open Object Browser from the View menu. There are three panes: an Objects pane on the left, a Members pane on the upper right, and a Description pane on the lower right. If you resize the Object Browser into a single column, the Objects pane moves to the top, the Members pane to the middle, and the Description pane to the bottom. The Objects pane contains an expandable tree of names whose top-level nodes represent Projects. Expand a Project name in the Objects pane to list the Main Program and/or Modules defined within it. Variables, constants, procedures, TYPEs, INTERFACEs, and USEs for the selected Object are listed in the Members pane. Details on the item selected in the Objects pane or Members pane appear in the Description pane. Note that if a project contains subprogram(s) and no Main Program definition, a placeholder for the Main Program named "(MAIN)" will appear in the Objects pane. Right-click on an item in the Members pane to find all references to that name or to open files, and navigate directly to the line where the name is defined. You can also click on a USEd module name in the Description pane to jump to that member in Object Browser. 
Other Development ToolsComplementing the Windows Development Environment, LF Fortran includes a linker, librarian, coverage tool, and other utilities for building and linking programs and libraries. Automation supportAutomation is the ability to control Visual Studio, solutions and projects with software. It allows the user to programmatically control project creation and modification, to set project and file compilation options, and to build and execute projects.MSBuild supportMSBuild is Microsoft's XML-based build system. It is integrated with Visual Studio, but it can also be used on the command line. The LF Fortran Project facility uses MSbuild when building projects. For a comprehensive description of MSBuild, see the MSDN documentation for msbuild.exe.Winteracter Starter KitUse the Winteracter Starter Kit -WiSK - to create GUI-based Fortran programs, using standard Windows controls. WiSK is a subset of the Winteracter toolset created by Interactive Software Services, Ltd. Winteracter is a Fortran callable, user-interface and graphics development kit with versions available for Windows, Linux and Mac OS X . Derived from Winteracter, WiSK provides a library of subroutines to manage user interface components such as windows, menus, dialogs, mouse and keyboard. Menus and dialogs are designed/maintained using the supplied visual resource editor, ResEdit. A manifest creation tool enables use of the latest visual styles on Windows XP onwards. A set of graphics primitives are also included in the WiSK library, along with source code for an emulation of the earlier Lahey Video Graphics Library. WiSK is completed by the Application Wizard, which provides a jump start when producing new GUI based applications. Click here to view/download all WiSK examples. 
Fujitsu Visual Analyzer. Visually analyze the call structure and logic flow of your Fortran and C source code. Display a detailed cross reference of all the variables in the program and where modules and commons are defined and referenced. Show C global variable definitions and references as well. VA can help you understand someone else's code, detect subtle programming errors across multiple files, and verify compliance with the Fortran 95 standard. LF Fortran 95 beta tester Barry Santana says, "Fujitsu Visual Analyzer has been a great help in avoiding conflicts in the modifications. The help that Lahey Technical Support has provided quickly and without hassle has provided this project with a much needed shot in the arm! It has confirmed that my decision to switch to the Lahey compiler was correct. Thanks for all the help." Fujitsu Scientific Subroutine Library 2.The Fujitsu Scientific Subroutine Library 2 (SSL2) has been in use for years in Japan on Fujitsu mainframe and workstation hardware. SSL2 offers over 250 optimized routines in the following areas: Linear Algebra
Eigenvalues and Eigenvectors
Nonlinear Equations
Extrema
Interpolation and Approximation
Transforms
Numerical Differentiation and Quadrature Differential Equations Special Functions
Pseudo Random Numbers
LF Fortran System RequirementsLahey Fortran with Visual Studio Fortran Support Visual Studio 201x must be installed before the Visual Studio Fortran Support package can be installed. Lahey/GNU Fortran must be installed for the Visual Studio Fortran Support to function correctly. Typical installation requirements for the Compiler with Visual Studio 2015:
Lahey Fortran (complete installation without Visual Studio Fortran Support)
Target Operating SystemLF Fortran applications are compatible with Microsoft Windows 10, 8.x, 7, Vista, XP, 2000, NT 4.0, Me, 98, and 95.Support PoliciesLahey provides support exclusively to licensed customers of Lahey products. However, if you have a trial version of our product and require some help getting started, please contact Lahey support. Terms of support Lahey provides installation and getting started email support for the compiler, tools and development environment, as well as access to product enhancements, upgrades and bug fixes, for a period of one year after purchase of the product. At the end of this period and each period thereafter, the customer has the option of renewing maintenance. If maintenance is not renewed, the language system will continue to function at the level it was when maintenance expired, but the customer will not be allowed any further access to product updates or bug fixes. Customers purchasing new hardware for use with an existing Lahey product can contact Lahey support at any time for assistance with new license keys.
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