From 754bbf7a25a8dda49b5d08ef0d0443bbf5af0e36 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Sun, 7 Apr 2024 13:41:34 -0500 Subject: new repository --- devdocs/c/numeric%2Fmath%2Fnearbyint.html | 78 +++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 devdocs/c/numeric%2Fmath%2Fnearbyint.html (limited to 'devdocs/c/numeric%2Fmath%2Fnearbyint.html') diff --git a/devdocs/c/numeric%2Fmath%2Fnearbyint.html b/devdocs/c/numeric%2Fmath%2Fnearbyint.html new file mode 100644 index 00000000..4f551258 --- /dev/null +++ b/devdocs/c/numeric%2Fmath%2Fnearbyint.html @@ -0,0 +1,78 @@ +

nearbyint, nearbyintf, nearbyintl

Defined in header <math.h> 
float       nearbyintf( float arg );
+		 (1) (since C99) 
double      nearbyint( double arg );
+		 (2) (since C99) 
long double nearbyintl( long double arg );
+		 (3) (since C99)
Defined in header <tgmath.h> 
#define nearbyint( arg )
+		 (4) (since C99)
+1-3) Rounds the floating-point argument arg to an integer value in floating-point format, using the current rounding mode.
+4) Type-generic macro: If arg has type long double, nearbyintl is called. Otherwise, if arg has integer type or the type double, nearbyint is called. Otherwise, nearbyintf is called, respectively.

Parameters

+ +
arg - floating point value

Return value

The nearest integer value to arg, according to the current rounding mode, is returned.

+

Error handling

This function is not subject to any of the errors specified in math_errhandling.

+

If the implementation supports IEEE floating-point arithmetic (IEC 60559),

+

Notes

The only difference between nearbyint and rint is that nearbyint never raises FE_INEXACT.

+

The largest representable floating-point values are exact integers in all standard floating-point formats, so nearbyint never overflows on its own; however the result may overflow any integer type (including intmax_t), when stored in an integer variable.

+

If the current rounding mode is FE_TONEAREST, this function rounds to even in halfway cases (like rint, but unlike round).

+

Example

#include <stdio.h>
+#include <math.h>
+#include <fenv.h>
+ 
+int main(void)
+{
+#pragma STDC FENV_ACCESS ON
+    fesetround(FE_TONEAREST);
+    printf("rounding to nearest:\nnearbyint(+2.3) = %+.1f  ", nearbyint(2.3));
+    printf("nearbyint(+2.5) = %+.1f  ", nearbyint(2.5));
+    printf("nearbyint(+3.5) = %+.1f\n", nearbyint(3.5));
+    printf("nearbyint(-2.3) = %+.1f  ", nearbyint(-2.3));
+    printf("nearbyint(-2.5) = %+.1f  ", nearbyint(-2.5));
+    printf("nearbyint(-3.5) = %+.1f\n", nearbyint(-3.5));
+ 
+    fesetround(FE_DOWNWARD);
+    printf("rounding down: \nnearbyint(+2.3) = %+.1f  ", nearbyint(2.3));
+    printf("nearbyint(+2.5) = %+.1f  ", nearbyint(2.5));
+    printf("nearbyint(+3.5) = %+.1f\n", nearbyint(3.5));
+    printf("nearbyint(-2.3) = %+.1f  ", nearbyint(-2.3));
+    printf("nearbyint(-2.5) = %+.1f  ", nearbyint(-2.5));
+    printf("nearbyint(-3.5) = %+.1f\n", nearbyint(-3.5));
+ 
+    printf("nearbyint(-0.0) = %+.1f\n", nearbyint(-0.0));
+    printf("nearbyint(-Inf) = %+.1f\n", nearbyint(-INFINITY));
+}

Output:

+
rounding to nearest:
+nearbyint(+2.3) = +2.0  nearbyint(+2.5) = +2.0  nearbyint(+3.5) = +4.0
+nearbyint(-2.3) = -2.0  nearbyint(-2.5) = -2.0  nearbyint(-3.5) = -4.0
+rounding down: 
+nearbyint(+2.3) = +2.0  nearbyint(+2.5) = +2.0  nearbyint(+3.5) = +3.0
+nearbyint(-2.3) = -3.0  nearbyint(-2.5) = -3.0  nearbyint(-3.5) = -4.0
+nearbyint(-0.0) = -0.0
+nearbyint(-Inf) = -inf

References

See also

+ + + +
+
(C99)(C99)(C99)(C99)(C99)(C99)(C99)(C99)(C99)
 rounds to an integer using current rounding mode with
exception if the result differs
(function)
+
(C99)(C99)(C99)(C99)(C99)(C99)(C99)(C99)(C99)
 rounds to nearest integer, rounding away from zero in halfway cases
(function)
+
(C99)(C99)
 gets or sets rounding direction
(function)
C++ documentation for nearbyint
+

+ © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
+ https://en.cppreference.com/w/c/numeric/math/nearbyint +

+
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