'C' Programming (CS215) - Page 2

**Zedric** · October 29th, 2004

Originally Posted by Mainframeguy

Agreed - plus if he starts to embed things like ASCII tables he may actually LOSE points since it will lose cross platform portability, say if it had to compile and run with EBCDIIC instead (where the alpha characters are not even consecutive

Do you really think a course with this assignment would care about cross platform portability?

Nevertheless, good point.

**X-Istence** · October 29th, 2004

Originally Posted by Zedric

Wouldn't

if chr == 'Z' then
return 'A'
else
return chr+1

work? Without having to complicate things with ASCII tables...

(not in C notation I know, but it was on purpose )

Yes, that would work. Just make sure that if you do it in C to cast the char to int first, and then have the function return a char.

so;

char next(char char) {
if (char == "Z")
return 'A';
else
return (int)char + 1;
}

Simple really.

If that code does not work, it is time for me to go read a C book again :P

**Geffy** · October 29th, 2004

Originally Posted by Mainframeguy

First - just off my head I kinow he was right and you are also wrong, you see in HEX the numbers add up fine.....

Second you got it back to front - UPPER case starts at x'41' and LOWER ar x'61'

Sorry to be a smart ass, but I thought I should clear that up, since this is meant to be a "learning" thread

hes moved up a notch then in my book, though when writing it on the board he should probably use the proper hex notation and not decimal

though in decimal my point of a 20 difference still stands

dal2lad · November 1st, 2004

Any voluntier to help me in my 'C' Programming ?

The Question:

The fuction below needs to be run in a program.

I solved this question but I want you to tell me if it is the wright selution

Write a recursive function called AddPos that take in an array of integers intarr and an integer parameter size that holds the number of values in intarr. The function sums up all positive values in intarr and return it. For example AddPos ({-1, 1, -1, 1, -1}, 5) returns 2 (1+1)

int AddPos (int intarr, int size)
{
if (size-1)<0)
return 0;
else
if(intarr [size]>0)
sum=sum+intarr[size-1]
return sum+AddPos(intarr, size--)
}

Thank you

**Zedric** · November 1st, 2004

I assume you didn't compile and test the code? You should, it helps alot!

Code:

int AddPos (int intarr, int size)
{
  if (size-1)<0)    <-- Wrong number of parenthesis and -1 isn't really needed if you use <= 0 instead
    return 0;
  else
    if(intarr [size]>0)    <-- Wrong element (gives error on first attempt) plus I don't know if the space is allowed before []
      sum=sum+intarr[size-1]    <--- Missing ;
  return sum+AddPos(intarr, size--)    <--- Missing ;
}

CHiLLaXen · November 1st, 2004

Zedric: you shouldn't give him all the answers, just give him some hints

**X-Istence** · November 1st, 2004

He is even far from giving him all the answers.

**Zedric** · November 1st, 2004

Originally Posted by CHiLLaXen

Zedric: you shouldn't give him all the answers, just give him some hints

Did I? At least I didn't give him compilable code.

He would have gotten those on his first compile and test run anyway.

October 29th, 2004	Top \| #21
Zedric NTFS Guru Joined: January 2002 Location: Sweden Posts: 4,006 Reputation: 890 Power: 175	Originally Posted by Mainframeguy Agreed - plus if he starts to embed things like ASCII tables he may actually LOSE points since it will lose cross platform portability, say if it had to compile and run with EBCDIIC instead (where the alpha characters are not even consecutive Do you really think a course with this assignment would care about cross platform portability? Nevertheless, good point. Did I help you? Please use the reputation system. Click the icon on the left! Proud host of the OSNN.net folding sigs. Want one? Check the folding thread! http://zedric.no-ip.com/

October 29th, 2004	Top \| #22
X-Istence * Joined: December 2001 Location: USA Posts: 6,496 Reputation: 2808 Power: 220	Originally Posted by Zedric Wouldn't if chr == 'Z' then return 'A' else return chr+1 work? Without having to complicate things with ASCII tables... (not in C notation I know, but it was on purpose ) Yes, that would work. Just make sure that if you do it in C to cast the char to int first, and then have the function return a char. so; char next(char char) { if (char == "Z") return 'A'; else return (int)char + 1; } Simple really. If that code does not work, it is time for me to go read a C book again :P An engineers technical notebook

October 29th, 2004	Top \| #23
Geffy OSNN Veteran Addict Joined: March 2002 Location: United Kingdom Posts: 7,805 Reputation: 1490 Power: 217	Originally Posted by Mainframeguy First - just off my head I kinow he was right and you are also wrong, you see in HEX the numbers add up fine..... Second you got it back to front - UPPER case starts at x'41' and LOWER ar x'61' Sorry to be a smart ass, but I thought I should clear that up, since this is meant to be a "learning" thread hes moved up a notch then in my book, though when writing it on the board he should probably use the proper hex notation and not decimal though in decimal my point of a 20 difference still stands  • blog • tumblog • lastfm • flickr • #rubyonrails • @twitter "I could be replaced with a very small shell script"

November 1st, 2004	Top \| #25
Zedric NTFS Guru Joined: January 2002 Location: Sweden Posts: 4,006 Reputation: 890 Power: 175	I assume you didn't compile and test the code? You should, it helps alot! Code: int AddPos (int intarr, int size) { if (size-1)<0) <-- Wrong number of parenthesis and -1 isn't really needed if you use <= 0 instead return 0; else if(intarr [size]>0) <-- Wrong element (gives error on first attempt) plus I don't know if the space is allowed before [] sum=sum+intarr[size-1] <--- Missing ; return sum+AddPos(intarr, size--) <--- Missing ; } Did I help you? Please use the reputation system. Click the icon on the left! Proud host of the OSNN.net folding sigs. Want one? Check the folding thread! http://zedric.no-ip.com/

November 1st, 2004	Top \| #27
X-Istence * Joined: December 2001 Location: USA Posts: 6,496 Reputation: 2808 Power: 220	He is even far from giving him all the answers. An engineers technical notebook

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November 1st, 2004	Top \| #24
dal2lad OSNN Junior Addict Joined: October 2004 Location: TU Posts: 5 Reputation: 0 Power: 93	Any voluntier to help me in my 'C' Programming ? The Question: The fuction below needs to be run in a program. I solved this question but I want you to tell me if it is the wright selution Write a recursive function called AddPos that take in an array of integers intarr and an integer parameter size that holds the number of values in intarr. The function sums up all positive values in intarr and return it. For example AddPos ({-1, 1, -1, 1, -1}, 5) returns 2 (1+1) int AddPos (int intarr, int size) { if (size-1)<0) return 0; else if(intarr [size]>0) sum=sum+intarr[size-1] return sum+AddPos(intarr, size--) } Thank you

November 1st, 2004	Top \| #26
CHiLLaXen hypnotika Joined: January 2004 Location: Minnesota Posts: 107 Reputation: 40 Power: 104	Zedric: you shouldn't give him all the answers, just give him some hints

November 1st, 2004	Top \| #28
Zedric NTFS Guru Joined: January 2002 Location: Sweden Posts: 4,006 Reputation: 890 Power: 175	Originally Posted by CHiLLaXen Zedric: you shouldn't give him all the answers, just give him some hints Did I? At least I didn't give him compilable code. He would have gotten those on his first compile and test run anyway. Did I help you? Please use the reputation system. Click the icon on the left! Proud host of the OSNN.net folding sigs. Want one? Check the folding thread! http://zedric.no-ip.com/

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