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J0(P)POSIX Programmer's Manual J0(P)NAMEj0, j1, jn - Bessel functions of the first kindSYNOPSIS#include <math.h> double j0(double x); double j1(double x); double jn(int n, double x);DESCRIPTIONThe j0(), j1(), and jn() functions shall compute Bessel functions of x of the first kind of orders 0, 1, and n, respectively. An application wishing to check for error situations should set errno to zero and call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if errno is non- zero or fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error has occurred.RETURN VALUEUpon successful completion, these functions shall return the relevant Bessel value of x of the first kind. If the x argument is too large in magnitude, or the correct result would cause underflow, 0 shall be returned and a range error may occur. If x is NaN, a NaN shall be returned.ERRORSThese functions may fail if: Range Error The value of x was too large in magnitude, or an underflow occurred. If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then errno shall be set to [ERANGE]. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non- zero, then the underflow floating-point exception shall be raised. No other errors shall occur. The following sections are informative.EXAMPLESNone.APPLICATION USAGEOn error, the expressions (math_errhandling & MATH_ERRNO) and (math_errhandling & MATH_ERREXCEPT) are independent of each other, but at least one of them must be non-zero.RATIONALENone.FUTURE DIRECTIONSNone.SEE ALSOfeclearexcept() , fetestexcept() , isnan() , y0() , the Base Definitions volume of IEEE Std 1003.1-2001, Section 4.18, Treatment of Error Conditions for Mathematical Func- tions, <math.h>COPYRIGHTPortions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information TechnologyPortable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The orig- inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .--IEEE/The Open Group 2003 J0(P)

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