C programming

[Christophe TROESTLER]

Hi the list,

I apologize if that is a little bit off topic but I am a bit puzzled
and  I  know there  are  experts  on this  list.   I  would like  an
explanation on why the two "for" below give different results.

Thanks,
ChriS


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#include <stdio.h>

main()
{
  double x, y, z;
  int t;
  
  for(x=.5, y=1./4., t=1;   z= x + y, z > x;   y /=2,  t++)
    ;
  printf("t=%i\n", t);

  for(x=.5, y=1./4., t=1;  x+y > x;   y /=2,  t++)
    ;
  printf("t=%i\n", t); 
}