Linux & Unix Commands - Search Man Pages

SQRT(P)POSIX Programmer's Manual SQRT(P)NAMEsqrt, sqrtf, sqrtl - square root functionSYNOPSIS#include <math.h> double sqrt(double x); float sqrtf(float x); long double sqrtl(long double x);DESCRIPTIONThese functions shall compute the square root of their argument x, sqrt(x). 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 square root of x. For finite values of x <, a domain error shall occur, and either a NaN (if supported), or an implementation-defined value shall be returned. If x is NaN, a NaN shall be returned. If x is +-0 or +Inf, x shall be returned. If x is-0, a domain error shall occur, and either a NaN (if supported), or an implemen- tation-defined value shall be returned.-InfERRORSThese functions shall fail if: Domain Error The finite value of x is <, or x is-0If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then errno shall be set to [EDOM]. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, then the invalid floating-point exception shall be raised. The following sections are informative.-Inf.EXAMPLESTaking the Square Root of 9.0 #include <math.h> ... double x = 9.0; double result; ... result = sqrt(x);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() , the Base Definitions volume of IEEE Std 1003.1-2001, Section 4.18, Treatment of Error Conditions for Mathematical Func- tions, <math.h>, <stdio.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 SQRT(P)

All times are GMT -4. The time now is 06:18 AM.