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%2Fsignbit.html | 35 +++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 devdocs/c/numeric%2Fmath%2Fsignbit.html (limited to 'devdocs/c/numeric%2Fmath%2Fsignbit.html') diff --git a/devdocs/c/numeric%2Fmath%2Fsignbit.html b/devdocs/c/numeric%2Fmath%2Fsignbit.html new file mode 100644 index 00000000..dc7e42da --- /dev/null +++ b/devdocs/c/numeric%2Fmath%2Fsignbit.html @@ -0,0 +1,35 @@ +

signbit

Defined in header <math.h> 
#define signbit( arg ) /* implementation defined */
+		 (since C99)

Determines if the given floating point number arg is negative. The macro returns an integral value.

+

Parameters

+ +
arg - floating point value

Return value

Nonzero integral value if arg is negative, ​0​ otherwise.

+

Notes

This macro detects the sign bit of zeroes, infinities, and NaNs. Along with copysign, this macro is one of the only two portable ways to examine the sign of a NaN.

+

Example

#include <math.h>
+#include <stdio.h>
+ 
+int main(void)
+{
+    printf("signbit(+0.0) = %d\n", signbit(+0.0));
+    printf("signbit(-0.0) = %d\n", signbit(-0.0));
+}

Possible output:

+
signbit(+0.0) = 0
+signbit(-0.0) = 128

References

See also

+ + +
+
(C99)(C99)
 computes absolute value of a floating-point value (\(\small{|x|}\)|x|)
(function)
+
(C99)(C99)(C99)
 produces a value with the magnitude of a given value and the sign of another given value
(function)
C++ documentation for signbit
+

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

+
-- cgit v1.2.3