A very beginner question!

sifeet · 11-06-2007, 05:37 AM

Hi,
I'm stuck in two exercises and need help.
The first one is to write a code which prints out the ASCII-tabel. I have no clue on this question.
The second one is to write a code which counts the characters used in a file. I can write a code which counts the number of characters in a row or in a text which is gotten from the terminal (e.x. via "getchar"). but I don't know how it would be with a file.

Can someone plz help me with these two questions?
tnx in advance.

matsp · 11-06-2007, 05:49 AM

Homework policy

If you post some code that shows that you are trying, we can help you along with some suitable hints and suggestions. Don't expect us to do the homework for you.

--
Mats

Adak · 11-06-2007, 05:56 AM

Check out Wikipedia or just google for ASCII. Basically, when you press a key, that key has an ASCII number assigned to it. The ASCII table is the list of the values that are agreed upon, for interpreting each key press.

If you can count the char's in a row of text from the terminal, then you need to just re-direct your input to be from a file, instead. How is the C keyword FILE used?

I don't feel like repeating what's in your book or class notes. Read up, and post your code to try these exercises.

Then we can specifically help you out, without getting carpal tunnel syndrome.

matsp · 11-06-2007, 06:00 AM

Quote:

Originally Posted by Adak

How is the C keyword FILE used?

[pedant mode]FILE is not a keyword in C. It is part of the ANSI library definitions, and it's usually a pointer to an anonymous struct [that is, we don't know the internal structure of a FILE struct][/pedant mode].

--
Mats

sifeet · 11-06-2007, 06:59 AM

Sorry, I didn't even think abt sending my code ! thoughtless done!
Here is the code.
I can't go any further. the only thing I've done here is to get the ascii numbers (in decimal form 0 to 127) I don't know how to define the variable "charac" for each characterin the tabel.

Code:

#include <stdio.h>
#include <stdbool.h>
int main()
{
    
   int ascinr,i;
   char charac; 
   printf("ASCII-Number       Character\n=======       =========\n");
   for (i=0;1<127;i++){
   ascinr=i;
   
   pritf("%d%f\n" ,ascinr,charac);
   
   }
    return 0;   
}

matsp · 11-06-2007, 07:09 AM

Code:

   printf("%d%f\n" ,ascinr,charac);

Aside from a misising n, you also have the wrong format for charac: It should be %c.

Of coruse, charac is also not set to anything, so it will print utter garbage.

--
Mats

**Salem** · 11-06-2007, 07:12 AM

> for (i=0;1<127;i++)
1 (aka ONE) is always less than 127
i (aka eye) might eventually make it past 127.

maverix · 11-06-2007, 07:12 AM

Quote:

Originally Posted by sifeet

Sorry, I didn't even think abt sending my code ! thoughtless done!
Here is the code.
I can't go any further. the only thing I've done here is to get the ascii numbers (in decimal form 0 to 127) I don't know how to define the variable "charac" for each characterin the tabel.

Code:

#include <stdio.h>
#include <stdbool.h>
int main()
{
    
   int ascinr,i;
   char charac; 
   printf("ASCII-Number       Character\n=======       =========\n");
   for (i=0;1<127;i++){
   ascinr=i;
   
   pritf("%d%f\n" ,ascinr,charac);
   
   }
    return 0;   
}

Well, the %f in your printf statement says the compiler to expect a floating point value and you are giving a character. Go through your C book and identify what format specifier is to be used for characters. Also, you could look at what are escape sequences to know how to print using tabs.

cheers
maverix

maverix · 11-06-2007, 07:13 AM

Well, the %f in your printf statement says the compiler to expect a floating point value and you are giving a character. Go through your C book and identify what format specifier is to be used for characters. Also, you could look at what are escape sequences to know how to print using tabs.

cheers
maverix

11-06-2007, 05:37 AM	#1
sifeet Registered User Join Date: Nov 2007 Posts: 25	A very beginner question! Hi, I'm stuck in two exercises and need help. The first one is to write a code which prints out the ASCII-tabel. I have no clue on this question. The second one is to write a code which counts the characters used in a file. I can write a code which counts the number of characters in a row or in a text which is gotten from the terminal (e.x. via "getchar"). but I don't know how it would be with a file. Can someone plz help me with these two questions? tnx in advance.
sifeet is offline

11-06-2007, 05:49 AM	#2
matsp Kernel hacker Join Date: Jul 2007 Location: Farncombe, Surrey, England Posts: 15,686	Homework policy If you post some code that shows that you are trying, we can help you along with some suitable hints and suggestions. Don't expect us to do the homework for you. -- Mats __________________ Compilers can produce warnings - make the compiler programmers happy: Use them! Please don't PM me for help - and no, I don't do help over instant messengers.
matsp is offline

11-06-2007, 05:56 AM	#3
Adak Registered User Join Date: Sep 2006 Posts: 3,148	Check out Wikipedia or just google for ASCII. Basically, when you press a key, that key has an ASCII number assigned to it. The ASCII table is the list of the values that are agreed upon, for interpreting each key press. If you can count the char's in a row of text from the terminal, then you need to just re-direct your input to be from a file, instead. How is the C keyword FILE used? I don't feel like repeating what's in your book or class notes. Read up, and post your code to try these exercises. Then we can specifically help you out, without getting carpal tunnel syndrome.
Adak is offline

11-06-2007, 06:59 AM	#5
sifeet Registered User Join Date: Nov 2007 Posts: 25	Sorry, I didn't even think abt sending my code ! thoughtless done! Here is the code. I can't go any further. the only thing I've done here is to get the ascii numbers (in decimal form 0 to 127) I don't know how to define the variable "charac" for each characterin the tabel. Code: #include <stdio.h> #include <stdbool.h> int main() { int ascinr,i; char charac; printf("ASCII-Number Character\n======= =========\n"); for (i=0;1<127;i++){ ascinr=i; pritf("%d%f\n" ,ascinr,charac); } return 0; }
sifeet is offline

11-06-2007, 07:09 AM	#6
matsp Kernel hacker Join Date: Jul 2007 Location: Farncombe, Surrey, England Posts: 15,686	Code: printf("%d%f\n" ,ascinr,charac); Aside from a misising n, you also have the wrong format for charac: It should be %c. Of coruse, charac is also not set to anything, so it will print utter garbage. -- Mats __________________ Compilers can produce warnings - make the compiler programmers happy: Use them! Please don't PM me for help - and no, I don't do help over instant messengers.
matsp is offline

11-06-2007, 07:12 AM	#7
Salem and the hat of Jobseeking Join Date: Aug 2001 Location: The edge of the known universe Posts: 21,681	> for (i=0;1<127;i++) 1 (aka ONE) is always less than 127 i (aka eye) might eventually make it past 127. __________________ If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
Salem is offline

11-06-2007, 07:13 AM	#9
maverix abyss - deep C Join Date: Oct 2007 Posts: 46	Well, the %f in your printf statement says the compiler to expect a floating point value and you are giving a character. Go through your C book and identify what format specifier is to be used for characters. Also, you could look at what are escape sequences to know how to print using tabs. cheers maverix
maverix is offline

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