Unexpected output from lex program -

-

i have written simple lex program perform average of positive numbers , program compiling fine i'm not able expected output.i'm passing input program file giving filename commandline argument.the output of lex program blank showing no result , i'm beginner in lex , appreciated . have attached code below. code written in redhat linux kernel version 2.4.

 %{  #include <stdio.h>  #include <stdlib.h>  %}  %% [0-9]+ return atoi(yytext); %%  void main() {   int val, total = 0, n = 0;   while ( (val = yylex()) > 0 ) {   total += val;   n++; } if (n > 0) printf(“ave = %d\n”, total/n); }

the input file contains numbers 3,6 , 4 , name of file passed command line argument.

./a.out < input

your program works me. i'm bit suspicious of yywrap missing, link -lfl (or alike) option. library contains yywrap , main. though i'm not able reproduce see, i'm wary maybe main libfl used. i'm assuming newlines in input file on output. different linkers have different ways of resolving multiple occurrences of same symbol.

all in think have problem in way program built, because specification seems ok. if add int yywrap(void) { return 1; } after main, can without libfl, advise user of lex , gnu-flex.


Comments

Post a Comment

Popular posts from this blog

Perl - how to grep a block of text from a file -

-
it can in xml or text format. how in general grep block of text in perl? <track type="ws"> <range> <rangestart>0</rangestart> <rangeend>146.912</rangeend> <locationindex>0</locationindex> <propertyindex>0</propertyindex> </range> </track> <track type="ps" id="1"> <range> <rangestart>0</rangestart> <rangeend>146.912</rangeend> <locationindex>1</locationindex> <propertyindex>1</propertyindex> </range> </track> i want grep type="ps" , till </range> . one solution open file, read line line , match block. open(fh, "file.txt"); foreach $line (<fh>) { if ($line =~ m/type="cc"(.*?)<\/range>/) { print $1; } } but there more optimal solution without reading file line l
Read more

delphi - How to remove all the grips on a coolbar if I have several coolbands? -

-
Image
if set mycoolbar.fixedorder true,only grip on first band hidden. well,if use delphi 7 create vcl forms application,then put coolbar on , create 3 coolbans hold other controls,only grip , top coolbands can hidden setting mycoolbar.fixedorder:=true. i've uploaded picture make things clear. you got fixedorder property wrong. fixed property not allow bands rearranged if set true . setting property of coolbar true keep user changing bands order @ runtime, user can still move , resize bands. can give advice can do, actual solution problem, well, have wait answer. my advice use 3 coolbars in row , setting "fixedorder" property true , bandborderstyle bsnone . way grip hidden on of them. about property, it's not bug of ide, actual preference of property.
Read more

javascript - Animating array of divs; only the final element is modified -

-
this baffling me @ moment. i'm experienced programmer looking throw bit of surprise fiancee on countdown page our wedding. desired effect simulated confetti falling behind main page. setup follows: i have array of divs in javascript. each div absolutely positioned on page. have interval set updates every 50 or milliseconds. on each tick, run loop on array of divs, , calculations , update positions. problem problem having, however, though can see divs created, stored array, , modified (in case, each has slight randomized rotation) during initialization phase, once tick update position starts, div stored in whatever last slot of array gets position updated. tried hard-coding each div index testing purposes, strictly last element update position. upon printing current "left" , "top" style values each div before , after calculations shows value has been changed, no visible change noticeable. here's basic code: javascript var container;
Read more