1 #include "f2c.h" 2 3 #ifdef KR_headers r_sign(a,b)4 double r_sign(a,b) real *a, *b; 5 #else 6 double r_sign(real *a, real *b) 7 #endif 8 { 9 double x; 10 x = (*a >= 0 ? *a : - *a); 11 return( *b >= 0 ? x : -x); 12 } 13