PI
unsigned short PI[4] = {0x2d18,0x5444,0x21fb,0x4009};
unsigned short PI[4] = {0x4009,0x21fb,0x5444,0x2d18};
unsigned short PI[4] = {040511,007732,0121041,064302,};
extern unsigned short PI[];
double PI = 3.14159265358979323846; /* pi */
{"atan2", atan2, &ZERO, &MONE, &PI, 0},
{"atan2", atan2, &ZERO, &MZERO, &PI, 0},
extern double PI;
{"atan2", atan2, &ONE, &MINF, &PI, 0},
MPI = -PI;
PIO2 = 0.5 * PI;
long double num[] = {-10.0L, -PI, -3.0L, -2.0L, -1.0L, -0.5L, -0.01L, 0.0L,
0.01L, 0.5L, 1.0L, 2.0L, 3.0L, PI, 10.0L};