i get an error after trying to run this code

Code:

---

#include<stdio.h>

void convert(char *str, int pn)


{
 
       
  char ch;
  char *words[] = {"ABC", "DEF", "GHI", "JKL", "MNO", "PRS", "TUV", "WXY"};

  if (str[pn] == '\0')
  {
      printf("%s\n", str);
      return;
  }
  ch = str[pn];
  if (ch < '2')
      convert(str, pn + 1);
  else
  {
      str[pn] = words[ch - '2'][0];
      convert(str, pn + 1);
      str[pn] = words[ch - '2'][1];
      convert(str, pn + 1);
      str[pn] = words[ch - '2'][2];
      convert(str, pn + 1);
      if (ch == '7' || ch == '9')
      {
          str[pn] = words[ch - '2'][3];
          convert(str, pn + 1);
      }
      str[pn] = ch;
  }
}


int main(void)
{
  convert("4663", 0);
  return 0;
}

---

i was trying to get a program to run like wat handphone does... like a motorolla's i-Tap function where it will let the user to choose a variety of letters to form a meaningful word.
please help me to debug it

Can somebody PLEASE put a '/' in the closing code tag.

hmmm....which closing tag... tell me please....i'm still new

Edit your first post and change the '[ CODE]' right at the bottom to '[ /CODE]'. Makes it readable ;) Ignore the spaces I put.

Your code errors becuase you're passing a string literal and treating it like a pointer to an array of characters you have allocated to you.
In other words you're trying to access memory you do not own.

try this

Code:

---

int main(void)
{
    char x[] = "4663";
    convert(x, 0);
    return 0;
}

---

and like the others said your [ CODE] tags are backwards making your post difficult to read.
should be something like:

[ CODE]
.... some code ....
[ /CODE]

(without the space before CODE of course)

Code:

---

#include<stdio.h>

void convert(char *str, int pn)


{


char ch;
char *words[] = {"ABC", "DEF", "GHI", "JKL", "MNO", "PRS", "TUV", "WXY"};

if (str[pn] == '\0')
{
printf("%s\n", str);
return;
}
ch = str[pn];
if (ch < '2')
convert(str, pn + 1);
else
{
str[pn] = words[ch - '2'][0];
convert(str, pn + 1);
str[pn] = words[ch - '2'][1];
convert(str, pn + 1);
str[pn] = words[ch - '2'][2];
convert(str, pn + 1);
if (ch == '7' || ch == '9')
{
str[pn] = words[ch - '2'][3];
convert(str, pn + 1);
}
str[pn] = ch;
}
}


int main(void)
{
convert("4663", 0);
return 0;
}

---

yes... it is solved... tq...
hmmm i'm stilll far from my target...this is automatic generation..
how to make it manual generation...