Thread: Here's a problem, any one helps me?

My programme is about a ticket system, I can compile and run with help of a nice person, but it is strange that when I have the first choice and the programme will print the message and have no response at all:

"Please merge the segments toger eg. type Bei Jing as Beijing"

The programme contains 4 files:
fatal.h fatal erros
tree.h tree header file
tree.c tree implementation file
project.c main file

This is amazingly rude, and isn't the first time I've seen you do this. You cannot expect people to just grab your whole project, compile it, debug it, and tell you what's wrong.

Do some trouble shooting. C is fairly linear. It's a simple process. If you don't know how to use a debugger, then just add printf lines:

printf("1 -- got this far\n"); fflush( stdout );
... some code line ...
printf("2 -- got this far\n"); fflush( stdout );

Also, you don't need to make a ton of posts to include multiple files or links.

Quzah.

This is amazingly rude, and isn't the first time I've seen you do this. You cannot expect people to just grab your whole project, compile it, debug it, and tell you what's wrong.

I am very sorry about that. I have tried your method but it is so strange that why the printf statement not works, although it is on the top of a do-while loop?

Code:

do
   {
     printf("Please enter the city you want to set off:");
     gets(cityf, sizeof(cityf), stdin);
     status = check(cityf, cityfc);
   } while (status != 1);

Code:

check(char cityi[], char tmp[])
{
  int i = 0;
  char city[21][10] = {.................A lot of things here};
  char citycd[21][10] = {................A lot of things here};
  while (i < 21)
    {
      if (strcmp(cityi, city[i]) == 1)
	{
	  strcpy(tmp, citycd[i]);	
	  return 1;
	}
    }
  return 0;
}

Originally posted by NightWalker
I am very sorry about that. I have tried your method but it is so strange that why the printf statement not works, although it is on the top of a do-while loop?

Code:

do
   {
     printf("Please enter the city you want to set off:");
     gets(cityf, sizeof(cityf), stdin);
     status = check(cityf, cityfc);
   } while (status != 1);

Here are a few things:
1) Try flushing the output stream:

printf("Please enter the city you want to set off:");
fflush( stdout );

2) gets doesn't take that many arguments. Perhaps you were thinking of fgets?

3) Check the return value of gets or fgets to see what's happening.

Code:

if( fgets( ... ) == NULL )
{
    printf("Oops!");
    fflush( stdout );
}

The reason you want to flush the output stream after your printf statements here is to make sure you are actually seeing the error. Your printf statement in your loop is probably happening, but the buffer is retaining the information rather than displaying it.

Quzah.

what's the meaning of the fflush statement??
I have add the fflush statement to the programme, it will print the message now, but the fgets still not works, no response after the message were printed, I cannot input anything:
Please enter the city you want to set off:

I have chaged these problems already, yep, I was refused by the return value of the strcmp(), I chaged and compile it, but when the programme print:
"Please enter the......"
There is no response at all.
BTW, What is a debugger? From where I can get it?
This is the new project.c I have. Thanks

And I use WINXP/gcc complier
The virtual environment of UNIX, the software cygwin

fortunately, I can run most part of my programme now, but still a little bit problem, I meet it frequently. Segmentation fault <core dumped> it seems like some problem like this, but I cannot find it easily, it must be happened in this two functions.

Code:

scanf("%d", num);

Code:

create(T1, i);
getserial(cityfc, citytc, sn, i);

void
create(SearchTree T, int num)
{
  Position P;
  char na[15], in[20], nn[15];
  printf("Please enter you name:");
  gets(na);
  printf("Please enter your personal ID number:");
  gets(in);
  printf("Please enter your nationality:");
  gets(nn);                             <=========Since here no problem
  Insert(num, T);
  P = Find(num, T);
  strcpy(P->Information.name, na);
  strcpy(P->Information.id, in);
  strcpy(P->Information.nal, nn);
}

void
getserial(const char cityfc[], const char citytc[], char sn[], int i)
{
  int array1[2], array2[2], counter;
  for (counter = 0; counter < 3; counter++)
    {
      array1[counter] = (int) cityfc[counter];
      array2[counter] = (int) citytc[counter];
    }
  sprintf(sn, "%d%d%d%d%d%d%d", array1[0], array1[1], array1[2], array2[0], array2[1], array2[2], i); 
}

After that statement, segmentation fault <core dumped>