Added math.rint() -- round according to current IEEE754 mode

gvanrossum · gvanrossum · commit 71260b846e9e · 2000-05-11T18:19:42.000Z
diff --git a/Doc/lib/libmath.tex b/Doc/lib/libmath.tex
@@ -93,6 +93,10 @@ \section{\module{math} ---
 Return \code{\var{x}**\var{y}}.
 \end{funcdesc}
 
+\begin{funcdesc}{rint}{x, y}
+Return the integer nearest to \var{x} as a real.
+\end{funcdesc}
+
 \begin{funcdesc}{sin}{x}
 Return the sine of \var{x}.
 \end{funcdesc}
diff --git a/Include/mymath.h b/Include/mymath.h
@@ -48,6 +48,7 @@ extern double hypot Py_PROTO((double, double));
 #undef log
 #undef log10
 #undef pow
+#undef rint
 #undef sin
 #undef sinh
 #undef sqrt
@@ -67,6 +68,7 @@ extern double hypot Py_PROTO((double, double));
 #define log logd
 #define log10 log10d
 #define pow powd
+#define rint rintd
 #define sin sind
 #define sinh sinhd
 #define sqrt sqrtd
diff --git a/Lib/test/output/test_math b/Lib/test/output/test_math
@@ -19,6 +19,7 @@ log
 log10
 modf
 pow
+rint
 sin
 sinh
 sqrt
diff --git a/Lib/test/test_math.py b/Lib/test/test_math.py
@@ -129,6 +129,12 @@ def testmodf(name, (v1, v2), (e1, e2)):
 testit('pow(2,1)', math.pow(2,1), 2)
 testit('pow(2,-1)', math.pow(2,-1), 0.5)
 
+print 'rint'
+testit('rint(0.7)', math.rint(0.7), 1)
+testit('rint(-0.3)', math.rint(-0.3), 0)
+testit('rint(2.5)', math.rint(2.5), 2)
+testit('rint(3.5)', math.rint(3.5), 4) 
+
 print 'sin'
 testit('sin(0)', math.sin(0), 0)
 testit('sin(pi/2)', math.sin(math.pi/2), 1)
diff --git a/Modules/mathmodule.c b/Modules/mathmodule.c
@@ -156,6 +156,8 @@ FUNC2(math_pow, power, math_pow_doc,
 FUNC2(math_pow, pow, math_pow_doc,
       "pow(x,y)\n\nReturn x**y.")
 #endif
+FUNC1(math_rint, rint, math_rint_doc,
+      "rint(x)\n\nReturn the integer nearest to x as a real.")
 FUNC1(math_sin, sin, math_sin_doc,
       "sin(x)\n\nReturn the sine of x.")
 FUNC1(math_sinh, sinh, math_sinh_doc,
@@ -267,6 +269,7 @@ static PyMethodDef math_methods[] = {
 	{"log10",	math_log10,	0,	math_log10_doc},
 	{"modf",	math_modf,	0,	math_modf_doc},
 	{"pow",		math_pow,	0,	math_pow_doc},
+	{"rint",	math_rint,	0,	math_rint_doc},
 	{"sin",		math_sin,	0,	math_sin_doc},
 	{"sinh",	math_sinh,	0,	math_sinh_doc},
 	{"sqrt",	math_sqrt,	0,	math_sqrt_doc},

-Original file line number
+Diff line change
 log10
 modf
 pow
 +rint
 sin
 sinh
 sqrt