strcat help

[frangac]

Hi All,

I am new with c and would like some help.
When reading a bin file the year is 06, the decimal value = 6 so I use the &rawtime to determine the year and then
cat it with the array (xya[j]) so that the result will printf 2006 and do this with the month as well as the day.
How can I strcat the "strncpy(datum,(char *)(ctime (&rawtime))+20,3);" (200) with the xya[j] array??????
Whenever I compile with gcc there are errors :
C.Fopen.c:170: warning: passing arg 2 of `strncat' makes pointer from integer without a cast
oC.Fopen.c:170: too few arguments to function `strncat'
What am I doing wrong or is there any other way to do this.

if(length < 10)
{
time (&rawtime);
if (xya[j]<10)
{
strncpy(datum,(char *)(ctime (&rawtime))+20,3);
datum[3]='\0';
}
else
{
strncpy(datum,(char *)(ctime (&rawtime))+20,2);
datum[2]='\0';
datum[3]='\0';
}
printf("XXXXX %s XXXXXX",datum);
strcat(datum,xya[j]);
// cat 200 with xya[j] (6) = 2006
}
//printf(" %d Len",length);
//printf("%x",xya[j]);
//printf(" Len %d ",length);

[Banfa]

Some points

• The compiler error given talks about errors calling strncat but you seem to be calling strncpy and strcat. Have you posted the code you compiled?
• (char *)(ctime (&rawtime))+20 there is no need for this cast ctime returns char * so this can be written as (ctime (&rawtime)+20
• datum[2]='\0';
  datum[3]='\0';
  For normal string processing there is no need to set the characters after the first null terminator to anything, setting datum[3] here is not required.
• strcat(datum,xya[j]); Since you have not posted the type of xya it is not possible to know exactly what the problem is. However the prototypeof strcat is
  char *strcat( char *strDestination, const char *strSource );
  so xya[j] must have type char *, this means that xya must be declared either as
  char *xya[N];
  or
  char xya[N][M];
  Where N and M are constants. From the error message and code I suspect that xya[j] has an integer type, may be declared as
  int xya[N];
  If this is the case then you will need to convert that integer to string first using either sprintf or some code of your own devising.