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20 Ιουλ 2009 · This yields negative infinity. If you need a float, you can either cast the result. float neg_inf = (float)-1/0.0; or use single precision arithmetic. float neg_inf = -1.0f/0.0f; The result is always the same, there is exactly one representation of negative infinity in both single and double precision, and they convert to each other as you ...
27 Δεκ 2013 · public static boolean isNegative(double d) { return Double.compare(d, 0.0) < 0; } A more efficient, if more obtuse, version is to check the signed bit. public static boolean isNegative(double d) { return Double.doubleToRawLongBits(d) < 0; } Note: Under IEEE-754 a NaN can have the same signed bit as a negative number.
16 Νοε 2013 · The biased-exponent field is filled with all 1 bits to indicate either infinity or an invalid result of a computation. Positive and negative infinity. Positive and negative infinity are represented thus: sign = 0 for positive infinity, 1 for negative infinity. biased exponent = all 1 bits. fraction = all 0 bits.
13 Μαΐ 2013 · 2. You need a doubly nested query. Better to say "Find the properties (pids) that are NOT Missing ANY OF the meter types THAT the property id 7 has" or. "Find the properties (pids) such that there does not exist a metertype belonging to pid 7 that does not also belong to this pid." Select DISTINCT pid -- outer query: "Show all pids ...
1. The result of the logical negation operator ! is 0 if the value of its operand compares unequal to 0, 1 if the value of its operand compares equal to 0. The result has type int. The expression !E is equivalent to (0==E). C11 §6.5.3.3 5. b below will typical have the value of 1 (or possible -1, see below). a = 8; b = !!a;
To work around this problem, some developers use the following Boolean identity: !num_value returns bool true if num_value == 0; false otherwise. !!num_value returns bool false if num_value == 0; true otherwise. The single negation is sufficient to convert num_value to bool; however, the double negation is necessary to restore the original ...
4 Φεβ 2016 · as a way to keep negative numbers negative and turn positive ones negative. This approach has a single flaw. It doesn't work for all integers. The range of Int32 type is from "-2 31" to "2 31 - 1." It means there's one more "negative" number. Consequently, Math.Abs(int.MinValue) throws an OverflowException. The correct way is to use conditional ...
9 Απρ 2013 · In javascript, using the "bang" operator (!) will return true if the given value is true, 1, not null, etc. It will return false if the value is undefined, null, 0, or an empty string. So the bang operator will always return a boolean value, but it will represent the opposite value of what you began with.
6 Μαΐ 2012 · Double-negation turns a "truthy" or "falsy" value into a Boolean value, true or false. Most are familiar ...
6 Φεβ 2018 · For double, this is 2 1024 −2 971, approximately 1.79769•10 308. std::numeric_limits<T>::min() is the smallest positive normal value. Floating-point formats often have an interval where the exponent cannot get any smaller, but the significand (fraction portion of the number) is allowed to get smaller until it reaches zero.
