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strcmp

Affan Rauf

In the example provided here, the strings are of different. I just wanted to ask what happens when at some index the array elements differ

as in

char * str1 = "Hello";
and
char * str2 = "Helio";
and I do
j = strcmp(str1, str2);

Will strcmp return the difference of ASCII's of the differing characters? i.e.
j = str1[3]-str2[3] in the above case

Parents
  • 0 in reply to Oleg Sergeev

    "Less in length? Less in what?"

    Less lexicographically.

    Here's the source from a well known C library implementation:

    int strcmp(char * src, char * dest)
{
   int ret = 0 ;

   while(!(ret=*(unsigned char *)src-
   *(unsigned char *)dest) && *dest)
   {
      ++src;
      ++dest;
   }

   if(ret<0)
      ret = -1 ;
   else
      if(ret>0)
         ret=1;

   return(ret);
}

Reply
  • 0 in reply to Oleg Sergeev

    "Less in length? Less in what?"

    Less lexicographically.

    Here's the source from a well known C library implementation:

    int strcmp(char * src, char * dest)
{
   int ret = 0 ;

   while(!(ret=*(unsigned char *)src-
   *(unsigned char *)dest) && *dest)
   {
      ++src;
      ++dest;
   }

   if(ret<0)
      ret = -1 ;
   else
      if(ret>0)
         ret=1;

   return(ret);
}

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