diff options
Diffstat (limited to 'man3/pow.3')
| -rw-r--r-- | man3/pow.3 | 61 |
1 files changed, 30 insertions, 31 deletions
@@ -13,7 +13,7 @@ .\" Modified 1995-08-14 by Arnt Gulbrandsen <agulbra@troll.no> .\" Modified 2002-07-27 by Walter Harms .\" (walter.harms@informatik.uni-oldenburg.de) -.TH pow 3 2023-07-20 "Linux man-pages 6.05.01" +.TH pow 3 2023-10-31 "Linux man-pages 6.7" .SH NAME pow, powf, powl \- power functions .SH LIBRARY @@ -22,17 +22,17 @@ Math library .SH SYNOPSIS .nf .B #include <math.h> -.PP +.P .BI "double pow(double " x ", double " y ); .BI "float powf(float " x ", float " y ); .BI "long double powl(long double " x ", long double " y ); .fi -.PP +.P .RS -4 Feature Test Macro Requirements for glibc (see .BR feature_test_macros (7)): .RE -.PP +.P .BR powf (), .BR powl (): .nf @@ -51,7 +51,7 @@ On success, these functions return the value of .I x to the power of .IR y . -.PP +.P If the result overflows, a range error occurs, .\" The range error is generated at least as far back as glibc 2.4 @@ -61,14 +61,14 @@ and the functions return or .BR HUGE_VALL , respectively, with the mathematically correct sign. -.PP +.P If result underflows, and is not representable, a range error occurs, and 0.0 with the appropriate sign is returned. .\" POSIX.1 does not specify the sign of the zero, .\" but https://www.sourceware.org/bugzilla/show_bug.cgi?id=2678 .\" points out that the zero has the wrong sign in some cases. -.PP +.P .\" pow(\(+-0, <0 [[odd]]) = HUGE_VAL* If .I x @@ -84,7 +84,7 @@ or is returned, with the same sign as .IR x . -.PP +.P .\" pow(\(+-0, <0 [[!odd]]) = HUGE_VAL* If .I x @@ -99,7 +99,7 @@ a pole error occurs and or .RB + HUGE_VALL , is returned. -.PP +.P .\" pow(\(+-0, >0 [[odd]]) = \(+-0 If .I x @@ -108,7 +108,7 @@ and .I y is an odd integer greater than 0, the result is +0 (\-0). -.PP +.P .\" pow(\(+-0, >0 [[!odd]]) = +0 If .I x @@ -117,7 +117,7 @@ and .I y greater than 0 and not an odd integer, the result is +0. -.PP +.P .\" pow(-1, \(+-INFINITY) = 1.0 If .I x @@ -126,21 +126,21 @@ and .I y is positive infinity or negative infinity, the result is 1.0. -.PP +.P .\" pow(+1, y) = 1.0 If .I x is +1, the result is 1.0 (even if .I y is a NaN). -.PP +.P .\" pow(x, \(+-0) = 1.0 If .I y is 0, the result is 1.0 (even if .I x is a NaN). -.PP +.P .\" pow(<0, y) = NaN If .I x @@ -149,7 +149,7 @@ is a finite value less than 0, and is a finite noninteger, a domain error occurs, .\" The domain error is generated at least as far back as glibc 2.4 and a NaN is returned. -.PP +.P .\" pow(|x|<1, -INFINITY) = INFINITY If the absolute value of .I x @@ -158,7 +158,7 @@ and .I y is negative infinity, the result is positive infinity. -.PP +.P .\" pow(|x|>1, -INFINITY) = +0 If the absolute value of .I x @@ -167,7 +167,7 @@ and .I y is negative infinity, the result is +0. -.PP +.P .\" pow(|x|<1, INFINITY) = +0 If the absolute value of .I x @@ -176,7 +176,7 @@ and .I y is positive infinity, the result is +0. -.PP +.P .\" pow(|x|>1, INFINITY) = INFINITY If the absolute value of .I x @@ -185,7 +185,7 @@ and .I y is positive infinity, the result is positive infinity. -.PP +.P .\" pow(-INFINITY, <0 [[odd]]) = -0 If .I x @@ -194,7 +194,7 @@ and .I y is an odd integer less than 0, the result is \-0. -.PP +.P .\" pow(-INFINITY, <0 [[!odd]]) = +0 If .I x @@ -203,7 +203,7 @@ and .I y less than 0 and not an odd integer, the result is +0. -.PP +.P .\" pow(-INFINITY, >0 [[odd]]) = -INFINITY If .I x @@ -212,7 +212,7 @@ and .I y is an odd integer greater than 0, the result is negative infinity. -.PP +.P .\" pow(-INFINITY, >0 [[!odd]]) = INFINITY If .I x @@ -221,7 +221,7 @@ and .I y greater than 0 and not an odd integer, the result is positive infinity. -.PP +.P .\" pow(INFINITY, <0) = +0 If .I x @@ -230,7 +230,7 @@ and .I y less than 0, the result is +0. -.PP +.P .\" pow(INFINITY, >0) = INFINITY If .I x @@ -239,7 +239,7 @@ and .I y greater than 0, the result is positive infinity. -.PP +.P .\" pow(NaN, y) or pow(x, NaN) = NaN Except as specified above, if .I x @@ -271,7 +271,7 @@ See .BR math_error (7) for information on how to determine whether an error has occurred when calling these functions. -.PP +.P The following errors can occur: .TP Domain error: \fIx\fP is negative, and \fIy\fP is a finite noninteger @@ -322,12 +322,11 @@ T{ .BR powl () T} Thread safety MT-Safe .TE -.sp 1 .SH STANDARDS C11, POSIX.1-2008. .SH HISTORY C99, POSIX.1-2001. -.PP +.P The variant returning .I double also conforms to @@ -349,13 +348,13 @@ nor This problem was fixed .\" commit c3d466cba1692708a19c6ff829d0386c83a0c6e5 in glibc 2.28. -.PP +.P A number of bugs .\" https://www.sourceware.org/bugzilla/show_bug.cgi?id=3866 in the glibc implementation of .BR pow () were fixed in glibc 2.16. -.PP +.P In glibc 2.9 and earlier, .\" .\" https://www.sourceware.org/bugzilla/show_bug.cgi?id=6776 @@ -369,7 +368,7 @@ Since glibc 2.10, .\" or possibly 2.9, I haven't found the source code change .\" and I don't have a 2.9 system to test glibc does the right thing. -.PP +.P In glibc 2.3.2 and earlier, .\" Actually, glibc 2.3.2 is the earliest test result I have; so yet .\" to confirm if this error occurs only in glibc 2.3.2. |