Zero handling in single-precision IEEE 754 arithmetic:
sizeof(float) = 4
+zero is unsigned		(CORRECT)
-zero is   signed		(CORRECT)
0 - 0 is unsigned		(CORRECT)
(-0) - (+0) is   signed		(CORRECT)
(+1)*(0) is unsigned		(CORRECT)
(-1)*(0) is   signed		(CORRECT)

Zero handling in double-precision IEEE 754 arithmetic:
sizeof(double) = 8
+zero is unsigned		(CORRECT)
-zero is   signed		(CORRECT)
0 - 0 is unsigned		(CORRECT)
(-0) - (+0) is   signed		(CORRECT)
(+1)*(0) is unsigned		(CORRECT)
(-1)*(0) is   signed		(CORRECT)

Zero handling in extended-precision IEEE 754 arithmetic:
sizeof(long double) = 16
+zero is unsigned		(CORRECT)
-zero is   signed		(CORRECT)
0 - 0 is unsigned		(CORRECT)
(-0) - (+0) is   signed		(CORRECT)
(+1)*(0) is unsigned		(CORRECT)
(-1)*(0) is   signed		(CORRECT)