octave: X11 DISPLAY environment variable not set
octave: disabling GUI features
warning: implicit conversion from numeric to char
warning: called from
    reverseFile at line 14 column 11
warning: implicit conversion from numeric to char
warning: called from
    reverseFile at line 14 column 11
warning: implicit conversion from numeric to char
warning: called from
    reverseFile at line 14 column 11
warning: implicit conversion from numeric to char
warning: called from
    reverseFile at line 14 column 11
warning: implicit conversion from numeric to char
warning: called from
    reverseFile at line 14 column 11
warning: implicit conversion from numeric to char
warning: called from
    reverseFile at line 14 column 11
warning: implicit conversion from numeric to char
warning: called from
    reverseFile at line 14 column 11
warning: implicit conversion from numeric to char
warning: called from
    reverseFile at line 14 column 11
warning: implicit conversion from numeric to char
warning: called from
    rever

Your reverse.txt:
,dliw eht dessorc I nehw ,dnA :yarG ycuL fo draeh dah I TFO
.dlihc yratilos ehT yad fo kaerb ta ees ot decnahc I
,room ediw a no tlewd ehS ;wenk ycuL edarmoc on ,etam oN
!rood namuh a ediseB werg reve taht gniht tseteews ehT���
;neerg eht nopu erah ehT ,yalp ta nwaf eht yps yam tey uoY
.nees eb erom reven lliW yarG ycuL fo ecaf teews eht tuB
;og tsum nwot eht ot uoY ���thgin ymrots a eb lliw thgin-oT���
���.wons eht hguorht rehtom ruoY thgil ot ,dlihC ,nretnal a ekat dnA
:od yldalg I lliw !rehtaF ,tahT���
���noonretfa ylecracs siT���
���!noom eht si rednoy dnA ,owt kcurts tsuj sah kcolc-retsnim ehT
;dnab-toggaf a deppans dnA ,kooh sih desiar rehtaF eht siht tA
.dnah reh ni nretnal ehT koot ycuL dna���;krow sih deilp eH
ekorts otnaw a ynam htiW :eor niatnuom eht si rehtilb toN
.ekoms ekil pu sesir tahT ,wons yredwop eht esrepsid teef reH
;nwod dna pu derednaw ehS :emit sti erofeb no emac mrots ehT
.nwot eht dehcaer reven tuB ,bmilc ycuL did llih a ynam dnA
;ediw dna raf gnituohs tneW thgin ta

Your reverse.txt:
,dliw eht dessorc I nehw ,dnA :yarG ycuL fo draeh dah I TFO
.dlihc yratilos ehT yad fo kaerb ta ees ot decnahc I
,room ediw a no tlewd ehS ;wenk ycuL edarmoc on ,etam oN
!rood namuh a ediseB werg reve taht gniht tseteews ehT���
;neerg eht nopu erah ehT ,yalp ta nwaf eht yps yam tey uoY
.nees eb erom reven lliW yarG ycuL fo ecaf teews eht tuB
;og tsum nwot eht ot uoY ���thgin ymrots a eb lliw thgin-oT���
���.wons eht hguorht rehtom ruoY thgil ot ,dlihC ,nretnal a ekat dnA
:od yldalg I lliw !rehtaF ,tahT���
���noonretfa ylecracs siT���
���!noom eht si rednoy dnA ,owt kcurts tsuj sah kcolc-retsnim ehT
;dnab-toggaf a deppans dnA ,kooh sih desiar rehtaF eht siht tA
.dnah reh ni nretnal ehT koot ycuL dna���;krow sih deilp eH
ekorts otnaw a ynam htiW :eor niatnuom eht si rehtilb toN
.ekoms ekil pu sesir tahT ,wons yredwop eht esrepsid teef reH
;nwod dna pu derednaw ehS :emit sti erofeb no emac mrots ehT
.nwot eht dehcaer reven tuB ,bmilc ycuL did llih a ynam dnA
;ediw dna raf gnituohs tneW thgin ta