Date:	Sun, 4 Dec 94 03:36:16 +0100
From:	sl051ma AT unidui DOT uni-duisburg DOT de (Michael Mauch)
To:	djgpp AT sun DOT soe DOT clarkson DOT edu
Subject:	Bug in __complex__ ?

Diskussion-In: /UNIDUI/DJGPP
 
Hi!
 
Maybe this is just a silly bug of mine, but _where_ is it?
 
The following program:
 
--------------
 
char* cf2a(__complex__ float z)
{ static char s[80];
  float x=__real__(z), y=__imag__(z);
 
  if(x!=0.0)
  { sprintf(s,"%.3g",x);
    if(y>0.0) strcat(s,"+");
  }
  else *s='\0';
 
  if(y!=0.0) sprintf(s+strlen(s),"%.3gi",y);
  return s;
}
 
main()
{
  __complex__ float a=2.0f+3.0fi, b=1.0f+0.0fi;
 
  printf("a=%s\n",cf2a(a));
  printf("b=%s\n",cf2a(b));
  printf("a+b=%s\n",cf2a(a+b));
  printf("a*b=%s\n",cf2a(a * b));
}
 
--------------
 
turns out to show:
 
a=2+3i
b=1
a+b=3+3i
a*b=2+2i
 
 
So what went wrong with this program? a*b=2+2i ??? I would appreciate  
gcc handle complex numbers, but this isn't the right way, is it?
I'm using 1.12m2.
 
BTW: is there a better way (sort of a formatter) to printf() a complex  
numb

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