• Log InLog In
  • Register
Liquid`
Team Liquid Liquipedia
EDT 16:28
CEST 22:28
KST 05:28
  • Home
  • Forum
  • Calendar
  • Streams
  • Liquipedia
  • Features
  • Store
  • EPT
  • TL+
  • StarCraft 2
  • Brood War
  • Smash
  • Heroes
  • Counter-Strike
  • Overwatch
  • Liquibet
  • Fantasy StarCraft
  • TLPD
  • StarCraft 2
  • Brood War
  • Blogs
Forum Sidebar
Events/Features
News
Featured News
Serral wins HomeStory Cup 2914Serral wins Maestros of the Game 243ByuL, and the Limitations of Standard Play3Team Liquid Map Contest #22: Results and Winners7Code S Season 2 (2026): RO4 and Finals Preview12
Community News
IntoTheTV X SOOP SC2 League : Weekly & Monthly4Clem: "I don't have that much hope in Blizzard"2ZeroSpace Early Access is Now Live!25Weekly Cups (July 13-19): Terran & Protoss rise; Zerg falters2Balance hotfix patch 5.0.16b (July 16)90
StarCraft 2
General
What's the best tug of war? Reynor: GSL Loss Wasn't About Preparation Format Balance hotfix patch 5.0.16b (July 16) How would you feel about frequent/monthly balance patches for SC2? Clem: "I don't have that much hope in Blizzard"
Tourneys
IntoTheTV X SOOP SC2 League : Weekly & Monthly INu's Battles#18 - Cure, herO, Rogue & ByuN RSL Revival: Season 6 - Qualifiers and Main Event Master Swan Open (Global Bronze-Master 2) WardiTV Summer Cup 2026
Strategy
[G] Having the right mentality to improve
Custom Maps
[M] (2) Industrial Park New Map Maker - Looking for Advice - Love or Hate
External Content
Mutation # 535 Assembly of Vengeance The PondCast: SC2 News & Results Mutation # 534 Burning Evacuation Mutation # 533 Die Together
Brood War
General
BGH Auto Balance -> http://bghmmr.eu/ ASL22 General Discussion BW General Discussion How Famous was FlaSh before his Debut? Animated Gateway
Tourneys
Escore Tournament - Season 3 Small VOD Thread 2.0 [Megathread] Daily Proleagues [IPSL] Spring 2026 Grand Finals - This Weekend!
Strategy
Simple Questions, Simple Answers PvT advise for noobs Fighting Spirit mining rates Creating a full chart of Zerg builds
Other Games
General Games
ZeroSpace Early Access is Now Live! Path of Exile General RTS Discussion Thread Nintendo Switch Thread Diablo IV
Dota 2
Looking for a Dota Mentor Official 'what is Dota anymore' discussion
League of Legends
TSM pausing esports and CLG Dead
Heroes of the Storm
Heroes of the Storm 2.0
Hearthstone
Deck construction bug
TL Mafia
TL Mafia Community Thread TL Mafia Power Rank NeO.D_StephenKing vs This Guy From 1 Million Dance Vanilla Mini Mafia
Community
General
US Politics Mega-thread Artificial Intelligence Thread Russo-Ukrainian War Thread How to buy a book - shipping from Korea to Europe The Games Industry And ATVI
Fan Clubs
The IdrA Fan Club The HerO Fan Club!
Media & Entertainment
Anime Discussion Thread Series you have seen recently... Movie Discussion! [Req][Books] Good Fantasy/SciFi books
Sports
TeamLiquid Health and Fitness Initiative For 2023 2024 - 2026 Football Thread Formula 1 Discussion MLB/Baseball 2023 McBoner: A hockey love story
World Cup 2022
Tech Support
Computer Build, Upgrade & Buying Resource Thread Simple Questions Simple Answers FPS when play League Of Legend on laptop
TL Community
Northern Ireland Global Starcraft The Automated Ban List
Blogs
How Games can Help with Majo…
TrAiDoS
Hello guys!
LIN1s
ASL S22 English Commentary…
namkraft
Poker (part 2)
Nebuchad
An Exploration of th…
waywardstrategy
Customize Sidebar...

Website Feedback

Closed Threads



Active: 4163 users

C++ noob question

Blogs > eMbrace
Post a Reply
1 2 Next All
eMbrace
Profile Blog Joined January 2009
United States1300 Posts
Last Edited: 2009-10-17 02:49:29
October 17 2009 02:48 GMT
#1
I've been doing quite well in my class, but I've finally hit something that I can't figure out.

Basically, we have to decode a text file back to english (Caesar Cipher), and we have to run the text file through the our progame via the Command Prompt.

I've finished writing my code, but I can't get it to feed me back any output -- wrong or right.

I don't get an error or anything just this:

(checking to see if files I need are there, they are)
+ Show Spoiler +
[image loading]


(running the txt file through my program, maybe?)
+ Show Spoiler +
[image loading]


As you can see, nothing happens, and no errors appear either.

thats how I was instructed to do it and it's worked once before the other day, but now I finished writing my code and I can't test it =/

If you feel like taking the time, you can look at that as well:

+ Show Spoiler +
#include <iostream>
#include <iomanip>
#include <math.h>



using namespace std;


char reverseCaesar( char ch );
char convPunct( char ch );
char convDigit( char ch );
char convRest(char ch);
//***************************************************************************************************************************
int main()
{
char ch;
int change;


cin >> ch;

while ( cin )
{
char change;
if( isalpha(ch) )
{
change = reverseCaesar(ch);

}
else if (ispunct(ch) )
{
change = convPunct(ch);

}
else if (isdigit(ch) )
{
change = convDigit(ch);

}

else
change = convRest(ch);

cin >> ch;
}


system ("pause");
return 0;
}

//***************************************************************************************************************************

char reverseCaesar( char ch )
{
int i;

if (ch <= 47 && ch > 44)
{
i = (int)ch + 23;
}
else if (ch <=99 && ch > 96)
{
i = (int)ch +23;
}
else

i = (int)ch - 3;

return char(i);
}

char convPunct( char ch )
{
switch(ch)
{
case ',': return '0';
break;
case '.': return '1';
break;
case '$': return '2';
break;
case '&': return '3';
break;
case '%': return '4';
break;
case '*': return '5';
break;
case '(': return '6';
break;
case ')': return '7';
break;
case '?': return '8';
break;
case '!': return '9';

default: return ch;

}
}

char convDigit( char ch )
{
switch(ch)
{
case '0': return '!';
break;
case '1': return ',';
break;
case '2': return ')';
break;
case '3': return '(';
break;
case '4': return '?';
break;
case '5': return '-';
break;
case '6': return '&';
break;
case '7': return '$';
break;
case '8': return '.';
break;
case '9': return '+';
break;

default: return ch;

}
}

char convRest(char ch)
{
if(ch==21)
ch='\n';
else if(ch==22)
ch=' ';
else
ch=ch;

return ch;
}


I haven't added documentation, but it's fairly straight forward -- taking the characters from the txt file and decoding them (we had to write and use our own functions as well).

I'm willing to bet my program wouldn't work even if I could see it, but i'd at least like to try.

any help would appreciated, it's due in a couple of hours =)

if I have to i'll just submit and see if I can edit and resubmit tomorrow .

thanks.







*
Shade692003
Profile Joined August 2005
Canada702 Posts
October 17 2009 02:58 GMT
#2
been pretty long since I've done anything like coding or w/e, but if I understand correctly you enter your text file path as a parameter for your program? shouldn't there be parameters in your main then?
I hate the post below mine because it feels War3-ish.
DrTJEckleburg
Profile Blog Joined February 2009
United States1080 Posts
October 17 2009 02:58 GMT
#3
I have no help for your question, but I do believe that your reign at the top of LB will end after you bet on MBC over KT Rolster.
Im pretty good at whistling with my hands, especially when Im holding a whistle.
paper
Profile Blog Joined September 2004
13196 Posts
Last Edited: 2009-10-17 02:59:19
October 17 2009 02:59 GMT
#4
[image loading]


voting for MBC is your problem


edit: YOU GUYS ARE TOO FAST
Hates FunπŸ€”
keV.
Profile Blog Joined February 2009
United States3214 Posts
Last Edited: 2009-10-17 03:04:04
October 17 2009 03:00 GMT
#5
Wait a minute something isn't right here.


I'm pretty sure you can't read a txt file with cin, while expecting a char.

I don't know the details of your assignment, but do you take the file you are reading from as a parameter? If you do, then you definitely need to take some command line arguments. If not, then you can just open the file in your main or accept it by input string, and read char by char until the end of file.
"brevity is the soul of wit" - William Shakesman
AcrossFiveJulys
Profile Blog Joined September 2005
United States3612 Posts
Last Edited: 2009-10-17 03:05:10
October 17 2009 03:01 GMT
#6
I'm a little confused about what you're asking, but I think you are asking why your program doesn't "do" anything when you run it. Okay, so given that...

Your second screenshot shows you running the program with the file as input correctly.

Now, your program doesn't produce any output on the command prompt because you aren't telling it to print anything. Use cout if you want to print messages to the command prompt. If you are trying to create a new file that contains the translation of the original file, you'll need to use an ofstream and output to that, or use "> some_file" when running the program and print to some_file using cout.

eMbrace
Profile Blog Joined January 2009
United States1300 Posts
October 17 2009 03:01 GMT
#7
On October 17 2009 11:58 DrTJEckleburg wrote:
I have no help for your question, but I do believe that your reign at the top of LB will end after you bet on MBC over KT Rolster.


i'm on top for a reason
AcrossFiveJulys
Profile Blog Joined September 2005
United States3612 Posts
October 17 2009 03:03 GMT
#8
On October 17 2009 12:00 keV. wrote:
Wait a minute something isn't right here.


I'm pretty sure you can't read a txt file with cin, while expecting a char.


Yes you can. Since he's using the "<" operator when running the program, it changes the stdin stream (which is what cin uses) to refer to the file instead of user input.
Shade692003
Profile Joined August 2005
Canada702 Posts
October 17 2009 03:03 GMT
#9
On October 17 2009 12:00 keV. wrote:
Wait a minute something isn't right here.


I'm pretty sure you can't read a txt file with cin, while expecting a char.



I think the cin are for reading the characters in the text files, once they are read he changes them according to their values. could be wrong tho.

Anyhow there is no output like the other guy said
I hate the post below mine because it feels War3-ish.
eMbrace
Profile Blog Joined January 2009
United States1300 Posts
October 17 2009 03:05 GMT
#10
On October 17 2009 12:01 AcrossFiveJulys wrote:
I'm a little confused about what you're asking, but I think you are asking why your program doesn't "do" anything when you run it. Okay, so given that...

Your second screenshot shows you running the program with the file as input correctly.

Now, your program doesn't produce any output on the command prompt because you aren't telling it to print anything. Use cout if you want to print messages to the command prompt. If you are trying to create a new file that contains the translation of the original file, you'll need to use an ofstream and output to that.



to put it into a new file, they taught us this format

program < input.txt > new.txt

i get a new file with nothing in it =/
Shade692003
Profile Joined August 2005
Canada702 Posts
Last Edited: 2009-10-17 03:06:46
October 17 2009 03:05 GMT
#11
So hmm, shoudn't you cout that ''change'' variable?

Edit: Try to cout the change variable at the end of the while loop, might cout the value into the new text file.
I hate the post below mine because it feels War3-ish.
keV.
Profile Blog Joined February 2009
United States3214 Posts
Last Edited: 2009-10-17 03:06:53
October 17 2009 03:05 GMT
#12
On October 17 2009 12:03 AcrossFiveJulys wrote:
Show nested quote +
On October 17 2009 12:00 keV. wrote:
Wait a minute something isn't right here.


I'm pretty sure you can't read a txt file with cin, while expecting a char.


Yes you can. Since he's using the "<" operator when running the program, it changes the stdin stream (which is what cin uses) to refer to the file instead of user input.


I don't think reading from a file without a file handle is a good idea.

its sad how long its been since I've worked with simple I/O input...
"brevity is the soul of wit" - William Shakesman
vAltyR
Profile Blog Joined July 2008
United States581 Posts
Last Edited: 2009-10-17 03:08:40
October 17 2009 03:05 GMT
#13
Commenting is your best friend. Especially when you're asking others to help with your program. I didn't think it'd make that much difference, but I've had time where I look back on code and think "wtf was I doing here again?"

Do you need to separate it into functions like that? Sometimes it gets confusing debugging so many functions, especially when the code isn't your own.


EDIT: Wait a second... You're reading this from a file, right? You have nothing set up for file IO.
λ‚΄ ν˜Έλ²„ν¬λΌν”„νŠΈλŠ” μž₯μ–΄λ‘œ 가득 μ°¨ μžˆμ–΄μš”
Ironson
Profile Joined February 2008
20 Posts
October 17 2009 03:06 GMT
#14
The program is well formed, but it doesn't output anything! You need to write the output to "cout" and stream it into a file. Your command would become something like: pgm6 < input.txt > output.txt
keV.
Profile Blog Joined February 2009
United States3214 Posts
October 17 2009 03:07 GMT
#15
Like whats been said in this thread, you need to either rewrite the original file as you read char by char or you need to print the output to a a new file or screen.
"brevity is the soul of wit" - William Shakesman
eMbrace
Profile Blog Joined January 2009
United States1300 Posts
Last Edited: 2009-10-17 03:09:14
October 17 2009 03:08 GMT
#16
On October 17 2009 12:06 Ironson wrote:
The program is well formed, but it doesn't output anything! You need to write the output to "cout" and stream it into a file. Your command would become something like: pgm6 < input.txt > output.txt


ok right, but how exactly do I make my program cout all the decoded characters at once after the loop is over?

and sorry for the code with out comments -- we did have to write functions to use in the main, i guess it's a way of them making us learn how they work.



Ironson
Profile Joined February 2008
20 Posts
October 17 2009 03:09 GMT
#17
Before your second "cin >> ch;", place "cout << change;".
eMbrace
Profile Blog Joined January 2009
United States1300 Posts
Last Edited: 2009-10-17 03:14:24
October 17 2009 03:13 GMT
#18
On October 17 2009 12:09 Ironson wrote:
Before your second "cin >> ch;", place "cout << change;".



woah, it worked.

got all the decoded next in a new file.

thanks a lot everyone -- you may have saved my A in this class.

now I can watch MBC just roll over KT tonight
keV.
Profile Blog Joined February 2009
United States3214 Posts
October 17 2009 03:13 GMT
#19
this should give you simple error checking output.

+ Show Spoiler +

int main()
{
char ch;
int change;


cin >> ch;

while ( cin )
{
char change;
if( isalpha(ch) )
{
change = reverseCaesar(ch);


}
else if (ispunct(ch) )
{
change = convPunct(ch);


}
else if (isdigit(ch) )
{
change = convDigit(ch);


}

else
change = convRest(ch);
//output goes here

cin >> ch;
}


system ("pause");
return 0;
}

"brevity is the soul of wit" - William Shakesman
eMbrace
Profile Blog Joined January 2009
United States1300 Posts
October 17 2009 03:17 GMT
#20
On October 17 2009 12:13 keV. wrote:
this should give you simple error checking output.

+ Show Spoiler +

int main()
{
char ch;
int change;


cin >> ch;

while ( cin )
{
char change;
if( isalpha(ch) )
{
change = reverseCaesar(ch);


}
else if (ispunct(ch) )
{
change = convPunct(ch);


}
else if (isdigit(ch) )
{
change = convDigit(ch);


}

else
change = convRest(ch);
//output goes here

cin >> ch;
}


system ("pause");
return 0;
}



thanks a bunch kev
1 2 Next All
Please log in or register to reply.
Live Events Refresh
Next event in 1h 32m
[ Submit Event ]
Live Streams
Refresh
StarCraft 2
mouzHeroMarine 399
ZombieGrub275
ProTech96
Counter-Strike
fl0m3082
Heroes of the Storm
Liquid`Hasu486
Other Games
tarik_tv5770
Grubby3951
singsing1438
shahzam1082
B2W.Neo225
UpATreeSC175
C9.Mang0168
ArmadaUGS139
JuggernautJason108
hungrybox107
Livibee63
Trikslyr51
SteadfastSC22
Organizations
StarCraft 2
Blizzard YouTube
StarCraft: Brood War
BSLTrovo
[ Show 16 non-featured ]
StarCraft 2
• intothetv
• AfreecaTV YouTube
• Kozan
• IndyKCrew
• LaughNgamezSOOP
• Migwel
• sooper7s
StarCraft: Brood War
• blackmanpl 52
• FirePhoenix10
• iopq 2
• BSLYoutube
• STPLYoutube
• ZZZeroYoutube
Other Games
• imaqtpie769
• Shiphtur567
• Scarra225
Upcoming Events
OSC
1h 32m
Replay Cast
4h 2m
Korean StarCraft League
6h 32m
Afreeca Starleague
7h 32m
RSL Revival
12h 32m
Serral vs SHIN
herO vs Solar
Online Event
18h 32m
RSL Revival
1d 12h
Clem vs ByuN
Rogue vs Lambo
OSC
1d 15h
WardiTV Weekly
2 days
Sparkling Tuna Cup
3 days
[ Show More ]
INu's Battles
3 days
Cure vs herO
ByuN vs Rogue
PiGosaur Cup
4 days
The PondCast
4 days
Kung Fu Cup
4 days
Patches Events
4 days
Replay Cast
5 days
CrankTV Team League
5 days
Replay Cast
6 days
CrankTV Team League
6 days
Liquipedia Results

Completed

Proleague 2026-07-22
HSC XXIX
Eternal Conflict S2 E3

Ongoing

CSL 2026 Summer (S21)
KCM Race Survival 2026 Season 3
Escore Tournament S3: W4
RSL Revival: Season 6
CranK Gathers Season 4: BW vs SC2 Team League
SCTL 2026 Spring
BLAST Bounty Summer Qual
Stake Ranked Episode 3
XSE Pro League 2026
IEM Cologne Major 2026
Stake Ranked Episode 2
CS Asia Championships 2026
Asian Champions League 2026
IEM Atlanta 2026
PGL Astana 2026

Upcoming

ASL S22 SEASON OPEN Day 2
Escore Tournament S3: W5
ASL Season 22: Qualifier #1
ASL Season 22: Qualifier #2
CSLAN 4
ASL Season 22
Blizzard Classic Cup 2026
HSC XXX
SC4ALL II: StarCraft II
Kung Fu Cup 2026 Grand Finals
Light Tournament 2026
Eternal Conflict S2 Finale
ESL Pro League Season 24
Stake Ranked Episode 4
Logitech G Connect 2026
SL StarSeries Fall 2026
FISSURE Playground #5
BLAST Open Fall 2026
Esports World Cup 2026
BLAST Bounty Summer 2026
TLPD

1. ByuN
2. TY
3. Dark
4. Solar
5. Stats
6. Nerchio
7. sOs
8. soO
9. INnoVation
10. Elazer
1. Rain
2. Flash
3. EffOrt
4. Last
5. Bisu
6. Soulkey
7. Mini
8. Sharp
Sidebar Settings...

Advertising | Privacy Policy | Terms Of Use | Contact Us

Original banner artwork: Jim Warren
The contents of this webpage are copyright © 2026 TLnet. All Rights Reserved.