signbit
if (signbit(x)) {
if (signbit(x)) {
if (signbit(x))
} else if (signbit(s) != signbit(c)) {
} else if (signbit(s) != signbit(c)) {
} else if (signbit(s) != signbit(c)) {
} else if (signbit(s) != signbit(c)) {
sgn = signbit(x);
sgn = signbit(x); /* old n */
extern int signbit __P((double));
signx = signbit(x);
if (signbit(s) != signbit(c)) {
if (signbit(s) != signbit(c)) {
if (signbit(s) != signbit(c)) {
if (signbit(s) != signbit(c)) {
} else if (signbit(y) == 0) {