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10 .TH SQRT 3M "Jul 12, 2006" "SunOS 5.11" "Mathematical Library Functions"
12 sqrt, sqrtf, sqrtl \- square root function
16 c99 [ \fIflag\fR... ] \fIfile\fR... \fB-lm\fR [ \fIlibrary\fR... ]
19 \fBdouble\fR \fBsqrt\fR(\fBdouble\fR \fIx\fR);
24 \fBfloat\fR \fBsqrtf\fR(\fBfloat\fR \fIx\fR);
29 \fBlong double\fR \fBsqrtl\fR(\fBlong double\fR \fIx\fR);
35 These functions compute the square root of their argument \fIx\fR.
39 Upon successful completion, these functions return the square root of \fIx\fR.
42 For finite values of \fIx\fR < \(mi0, a domain error occurs and either a NaN
43 (if supported) or an implementation-defined value is returned.
46 If \fIx\fR is NaN, a NaN is returned.
49 If \fIx\fR is \(+-0 or +Inf, \fIx\fR is returned.
52 If \fIx\fR is \(miInf, a domain error occurs and a NaN is returned.
56 These functions will fail if:
65 The finite value of \fIx\fR is < \(mi0 or \fIx\fR is \(miInf.
67 If the integer expression (\fBmath_errhandling\fR & \fBMATH_ERREXCEPT\fR) is
68 non-zero, the invalid floating-point exception is raised.
70 The \fBsqrt()\fR function sets \fBerrno\fR to \fBEDOM\fR if the value of
77 An application wanting to check for exceptions should call
78 \fBfeclearexcept\fR(\fBFE_ALL_EXCEPT\fR) before calling these functions. On
79 return, if \fBfetestexcept\fR(\fBFE_INVALID\fR | \fBFE_DIVBYZERO\fR |
80 \fBFE_OVERFLOW\fR | \fBFE_UNDERFLOW\fR) is non-zero, an exception has been
81 raised. An application should either examine the return value or check the
82 floating point exception flags to detect exceptions.
85 An application can also set \fBerrno\fR to 0 before calling \fBsqrt()\fR. On
86 return, if \fBerrno\fR is non-zero, an error has occurred. The \fBsqrtf()\fR
87 and \fBsqrtl()\fR functions do not set \fBerrno\fR.
91 See \fBattributes\fR(5) for descriptions of the following attributes:
100 ATTRIBUTE TYPE ATTRIBUTE VALUE
102 Interface Stability Standard
110 \fBfeclearexcept\fR(3M), \fBfetestexcept\fR(3M), \fBisnan\fR(3M),
111 \fBmath.h\fR(3HEAD), \fBattributes\fR(5), \fBstandards\fR(5)