V10/libF77/r_atn2.c

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#include "f2c.h"

#ifdef KR_headers
double atan2();
double r_atn2(x,y) real *x, *y;
#else
#undef abs
#include "math.h"
double r_atn2(real *x, real *y)
#endif
{
return( atan2(*x,*y) );
}