*** Call Procedure Fortran like Example *** ---- This page is under development. Comments are welcome, but please load any comments in the comments section at the bottom of the page. Please include your wiki MONIKER and date in your comment with the same courtesy that I will give you. Aside from your courtesy, your wiki MONIKER and date as a signature and minimal good faith of any internet post are the rules of this TCL-WIKI. Its very hard to reply reasonably without some background of the correspondent on his WIKI bio page. Thanks, [gold] 12Dec2018 ---- <> ---- **Introduction** ---- [gold]roughly 2011-05-18. Here is an eTCL script on Call Procedure [Fortran] like. A call statement has some advantages in both [Fortran] and [TCL] languages. In some of the [Fortran] language versions, the call statement was used to call subroutines. For example, a call exit could be used to halt the program execution. For TCL, a call procedure can be developed that does not have to use brackets. The call statement is used to organize programs into a list of subroutines and to exit the program. Exiting a program was not a trivial function in the early days of programming. So a statement like "call exit" seemed pretty swank. Below, a generic TCL program passes control through various dummy procedures. Some "puts bye " and math statements are used to show control is passing through the procedures. ---- [gold] 12Dec2018. I have been informed that an advanced user has added and checked this subroutine into his homebrew TCL or his local copy of TCL on a PC system. **Pseudocode Section** ====== console show proc call {args} {uplevel catch [list $args]} call initilize ;# list variables call subroutine1 call subroutine2 call subroutine3 call subroutine4 call exit ;# stop statement proc initilize return proc subroutine1 return proc subroutine2 return proc subroutine3 return proc subroutine4 call math sin(.5) return ... pseudocode: ====== ---- ***References:*** * [Radical Language Modification] * [Functional Programming] * [expr shorthand for Tcl9] * [Steps towards functional programming] * [Tacit programming] * The fortran call statement appeared in Fortran2 (1958). example of call exit, fortran 4 * Thocp code, http://www.thocp.net/software/languages/fortran.htm ---- **** Pretty Print Version **** ====== # autoindent syntax from ased editor. # call procedure like fortran example # written on Windows XP on eTCL # working under TCL version 8.5.6 and eTCL 1.0.1 package require Tk console show proc call {args} {uplevel catch [list $args]} proc math { args } { set tcl_precision 17; puts [ expr [ expr { $args } ] ] } proc initilize {aa} { puts "subroutine initilize active" return } proc subroutine1 {aa} { puts "subroutine 1 active" return } proc subroutine2 {aa} { puts "subroutine 2 active" return } proc subroutine3 {aa} { puts "subroutine 3 active" return } proc subroutine4 {aa} { puts "subroutine 4 active" call math sin (.5) if { 1 == 1 } { puts "bye" } if { 1 == 2 } { call exit } return } call initilize ;# list variables call subroutine1 1 call subroutine2 2 call subroutine3 3 call subroutine4 4 call math sin (.5) if { 1 == 1 } { puts "bye bye" } % console output 0.479425538604203 bye 0.479425538604203 bye bye ====== ****Appendix Code**** ****appendix TCL programs and scripts **** **Example 2, code scraps** ====== console show proc pie {} {expr acos(-1)} proc writer {args } { puts $args } proc call {args} {uplevel catch [list $args]} call writer "jack" "&" "jill" call writer jack & jill went up the hill with [pie] ====== % console output jack & jill jack & jill went up the hill with 3.141592653589793 **Example 3, Code scraps** ====== console show proc pie {} {expr acos(-1)} proc writer {args } { puts $args } proc math { args } { set tcl_precision 17; puts [ expr [ expr { $args } ] ] } proc mathx { args } { set tcl_precision 17; return [ expr [ expr { $args } ] ] } proc call {args} {uplevel catch [list $args]} call math 5 + 5 call math 5 + 5 call math sin (.5) set ccc [ mathx sin (.5) ] puts " value $ccc " ====== % console output 10 10 0.479425538604203 value 0.479425538604203 **Example 4, Code scraps** ====== #ref. func proc from http://wiki.tcl.tk/14006 #Tacit programming #Tacit programming.mht,RS console show proc pie {} {expr acos(-1)} set aa 1 proc call {args} {uplevel catch [list $args]} proc math { args } { set tcl_precision 17; puts [ expr [ expr { $args } ] ] } proc func {name argl body} {proc $name $argl [list expr $body]} func atand aa (180./[pie])*atan($aa) puts " [atand 1. ] " console show proc pie {} {expr acos(-1)} set aa 1 proc call {args} {uplevel catch [list $args]} proc math { args } { set tcl_precision 17; puts [ expr [ expr { $args } ] ] } proc func {name argl body} {proc $name $argl [list expr $body]} func atand aa (180./[pie])*atan($aa) set aaa [ atand 1. ] puts $aaa #end of deck ====== ---- **Example 5, Code scraps** output from console with program loaded, [gold] ====== 1% call subroutine2 call subroutine 2 active6 % call 0 7% call call 0 8% call call call 0 #trivial (zero list) but no errors from multiple calls. ====== ---- [gold] This page is copyrighted under the TCL/TK license terms, [http://tcl.tk/software/tcltk/license.html%|%this license]. ---- **Comments Section** ---- <> ---- Please place any comments here with your wiki MONIKER and date, Thanks.[gold]12Dec2018 ---- <> Numerical Analysis | Toys | Calculator | Mathematics| Example| Toys and Games | Games | Application | GUI ---- <> Development | Concept| Algorithm|Language|programming language| Fortran