This malloc shouldn't work

Question

Here is my code.

 int     main()
  {
  char *s;
  int i = 0;

  printf(\"%lu \\n\", sizeof(s));

  s = malloc(sizeof(char) * 2);

  printf(\"%lu \\n\", sizeof(s         


        

Answer 1

it's seems like this: malloc allocates some bytes more than you specify..

when you use malloc(sizeof(s)*2); //8 then while (i <= 36) is ok, but while (i <= 37) already not..

when you use e.g malloc(sizeof(s)*4); //16 then while (i <= 7572) is ok, but while (i <= 7573) already not..

(I tested in code::blocks)

Too bad that Dennis Ritchie is dead, it's still big mystery why it's like that, but just don' worry about it too much just allocate always enough you need and null terminate strings too