int

问题 Why does the following behave unexpectedly in Python? >>> a = 256 >>> b = 256 >>> a is b True # This is an expected result >>> a = 257 >>> b = 257 >>> a is b False # What happened here? Why is this False? >>> 257 is 257 True # Yet the literal numbers compare properly I am using Python 2.5.2. Trying some different versions of Python, it appears that Python 2.3.3 shows the above behaviour between 99 and 100. Based on the above, I can hypothesize that Python is internally implemented such that

问题 My question is how compile time constant works internally so we didn't get an error in Below statement. final int a = 10; byte b = a; And why am I getting error in this statement. int a = 10; byte b = a; 回答1: This is because not all ints will fit into a byte. In your first example, the value of a is known and cannot change. The compiler knows that it will fit into a byte. In your second example, because a is not final, it's possible that it could have been changed (though not in your example)

问题 I have this question that has completely stumped me. I have to create a variable that equals Integer.MAX_VALUE... (in Java) // The answer must contain balanced parentesis public class Exercise{ public static void main(String [] arg){ [???] assert (Integer.MAX_VALUE==i); } } The challenge is that the source code cannot contain the words "Integer", "Float", "Double" or any digits (0 - 9). 回答1: Here's a succinct method: int ONE = "x".length(); int i = -ONE >>> ONE; //unsigned shift This works

问题 This question already has answers here : Regular cast vs. static_cast vs. dynamic_cast [duplicate] (8 answers) Why use static_cast<int>(x) instead of (int)x? (9 answers) Closed 6 years ago . In traditional C you can do: int i = 48; char c = (char)i; //Now c holds the value of 48. //(Of course if i > 255 then c will not hold the same value as i). Which of the c++ casting methods (static_cast, reinterpret_cast) is suited for getting this job done? 回答1: You can implicitly convert between

问题 I want to modify LocalDateTime.now() by adding a certain amount of minutes to it. How do I do that? 回答1: If you are using java 8 then you can still use the same syntax LocalDateTime fiveMinutesLater = LocalDateTime.now().plusMinutes(5) 来源： https://stackoverflow.com/questions/30374796/how-can-i-add-an-int-minutes-to-localdatetime-now

问题 for a long while, i have been trying to get a piece of code to work, and it just is not possible. the class i have requires a generic which i have set to Integer. so i tried the follwoing: public class a<T> //set generics for this function { private T A; protected boolean d; public a(final T A) { this.A = A; //do calculations //since constructor cannot return a value, pass to another function. this.d = retnData(Integer.parseInt(A.toString()) != 100); //convert to an integer, the backwards way

问题 for a long while, i have been trying to get a piece of code to work, and it just is not possible. the class i have requires a generic which i have set to Integer. so i tried the follwoing: public class a<T> //set generics for this function { private T A; protected boolean d; public a(final T A) { this.A = A; //do calculations //since constructor cannot return a value, pass to another function. this.d = retnData(Integer.parseInt(A.toString()) != 100); //convert to an integer, the backwards way

问题 I have this binary array: int[] bitArray = { 0,1,0,1,0,1,0,0,0,1,1,0,1,0,0,0,0,1,1,0,0,1,0,1,0,0,1,0,0,0,0,0,0,1,1,1,0,0,1,1, 0,1,1,1,0,1,0,1,0,1,1,0,1,1,1,0,0,0,1,0,0,0,0,0,0,1,1,0,1,0,0,1,0,1,1,1,0,0,1,1, 0,0,1,0,0,0,0,0,0,1,1,0,1,0,0,1,0,1,1,0,1,1,1,0,0,0,1,0,0,0,0,0,0,1,1,1,0,1,0,0, 0,1,1,0,1,0,0,0,0,1,1,0,0,1,0,1,0,0,1,0,0,0,0,0,0,1,1,1,0,0,1,1,0,1,1,0,1,0,1,1, 0,1,1,1,1,0,0,1,}; It makes the phrase: The sun is in the sky How would you convert the int binary array to a char ? 回答1: Every

问题 I have this binary array: int[] bitArray = { 0,1,0,1,0,1,0,0,0,1,1,0,1,0,0,0,0,1,1,0,0,1,0,1,0,0,1,0,0,0,0,0,0,1,1,1,0,0,1,1, 0,1,1,1,0,1,0,1,0,1,1,0,1,1,1,0,0,0,1,0,0,0,0,0,0,1,1,0,1,0,0,1,0,1,1,1,0,0,1,1, 0,0,1,0,0,0,0,0,0,1,1,0,1,0,0,1,0,1,1,0,1,1,1,0,0,0,1,0,0,0,0,0,0,1,1,1,0,1,0,0, 0,1,1,0,1,0,0,0,0,1,1,0,0,1,0,1,0,0,1,0,0,0,0,0,0,1,1,1,0,0,1,1,0,1,1,0,1,0,1,1, 0,1,1,1,1,0,0,1,}; It makes the phrase: The sun is in the sky How would you convert the int binary array to a char ? 回答1: Every

问题 Why does Python return True when I compare int and float objects which have the same value? For example: >>> 5*2 == 5.0*2.0 True 回答1: It's not as simple as a type conversion. 10 == 10.0 delegates to the arguments' __eq__ methods, trying (10).__eq__(10.0) first, and then (10.0).__eq__(10) if the first call returns NotImplemented . It makes no attempt to convert types. (Technically, the method lookup uses a special routine that bypasses instance __dict__ entries and __getattribute__ / __getattr