integer

问题 I'm a newbie Java coder and I just read a variable of an integer class can be described three different ways in the API. I have the following code: if (count.compareTo(0)) { System.out.println(out_table); count++; } This is inside a loop and just outputs out_table . My goal is to figure out how to see if the value in integer count > 0 . I realize the count.compare(0) is the correct way? or is it count.equals(0) ? I know the count == 0 is incorrect. Is this right? Is there a value comparison

问题 I'm a newbie Java coder and I just read a variable of an integer class can be described three different ways in the API. I have the following code: if (count.compareTo(0)) { System.out.println(out_table); count++; } This is inside a loop and just outputs out_table . My goal is to figure out how to see if the value in integer count > 0 . I realize the count.compare(0) is the correct way? or is it count.equals(0) ? I know the count == 0 is incorrect. Is this right? Is there a value comparison

问题 This is an interview question. Given an array of integers, find the single integer value in the array which occurs with even frequency. All integers will be positive. All other numbers occur odd frequency. The max number in the array can be INT_MAX. For example, [2, 8, 6, 2] should return 2. the original array can be modified if you can find better solutions such as O(1) space with O(n) time. I know how to solve it by hashtable (traverse and count freq). It is O(n) time and space. Is it

问题 I have a pandas data frame with 50k rows. I'm trying to add a new column that is a randomly generated integer from 1 to 5. If I want 50k random numbers I'd use: df1['randNumCol'] = random.sample(xrange(50000), len(df1)) but for this I'm not sure how to do it. Side note in R, I'd do: sample(1:5, 50000, replace = TRUE) Any suggestions? 回答1: One solution is to use numpy.random.randint: import numpy as np df1['randNumCol'] = np.random.randint(1, 6, df1.shape[0]) Or if the numbers are non

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 years ago . I'm creating a login system that currently uses hard coded integers for a UserID, password and Student number which means they are all numbers. What would I use to be able to make the integers (the UserID and password) words instead of numbers? This is how it currently looks; public static void

问题 In JDK 8: public static int numberOfLeadingZeros(int i) { if (i == 0) return 32; int n = 1; // if the first leftest one bit occurs in the low 16 bits if (i >>> 16 == 0) { n += 16; i <<= 16; } if (i >>> 24 == 0) { n += 8; i <<= 8; } if (i >>> 28 == 0) { n += 4; i <<= 4; } if (i >>> 30 == 0) { n += 2; i <<= 2; } n -= i >>> 31; return n; } By judging if the leftest first one bit is in the low x bits. public static int numberOfTrailingZeros(int i) { int y; if (i == 0) return 32; int n = 31; // if

问题 I need help with my code. I would like to write only numbers/integers in my textbox and would like to display that in my listbox. Is my code below in order? This seems to give an error. int yourInteger; string newItem; newItem = textBox1.Text.Trim(); if (newItem == Convert.ToInt32(textBox1.Text)) { listBox1.Items.Add(newItem); } ==== Update: This is how my code looks like now. My question is, can listBox handle the data type "long"? Because when I entered the number 20,000,000 I just got an

问题 I need help with my code. I would like to write only numbers/integers in my textbox and would like to display that in my listbox. Is my code below in order? This seems to give an error. int yourInteger; string newItem; newItem = textBox1.Text.Trim(); if (newItem == Convert.ToInt32(textBox1.Text)) { listBox1.Items.Add(newItem); } ==== Update: This is how my code looks like now. My question is, can listBox handle the data type "long"? Because when I entered the number 20,000,000 I just got an

问题 The int type in python offers two attributes named numerator and real that have the same content as __int__() . As all of these 3 values returns the same internal attribute, I guess real is a property like: @property def real(self): return self.__int However I cannot find this hidden property dir dir or either a = int(); a._int__<tab> in IPython. So I looked at the source code and found this: static PyGetSetDef int_getset[] = { {"real", (getter)int_int, (setter)NULL, "the real part of a

问题 I'm baffled what these numbers mean. To me it seems that printf gives me wrong results. echo printf("%.2f", 1); // 1.004 echo printf("%.3f", 1); // 1.005 echo printf("%.2f", 1.1234); // 1.124 First of all it seems to print too many decimals and I have no idea what those numbers are. Can someone shed some light on this matter? 回答1: Simple. printf() has a return value, which is integer. And that value is - length of resulting string. Thus, your code is doing two things: First, format & output