boolean

问题 I have been doing work in C language as it was my first language from where i started.This time i was doing some coding with if else statement...and i find something which i cannot understand why it was happening.The code is as follow #include<stdio.h> #include<conio.h> void main() { printf("How If - Else works\n"); if("hello") { printf("Inside if\n"); } else { printf("Inside else\n"); } getch(); } In this the output was Inside if....i want to know how this thing get evaluated inside the if

问题 How do I do full boolean text search in R? I am using str_match which works only with OR or | operator, or I use Reduce function with &. Is there a way to do AND, OR and XOR seamlessly for text search in R? 回答1: consider using the rlucene package which connects to the lucene search library which provides full-text search including a BooleanQuery which siport AND OR and NOT. 来源： https://stackoverflow.com/questions/32124185/boolean-text-search-in-r

问题 I wrote this code to determine whether or not an inputted year is a leap year. Meaning, those divisible by 4 and 400 are leap years, and by 100 or something else are not. But, my program always returns true for the boolean value, so that output will believe every year is a leap year. Here's my code so far: #include <iostream> #include <cmath> #include <string> #include <iomanip> using namespace std; bool leap_year(int year); int main() { int year; bool leap_year(int year); cout << "Please

问题 Im doing an inheritance question and I have everything completed except the Boolean part. My code will compile, but when comparing the name, birthday, and ssn, it will only come out as false. For example, I inputted: Jim 6 30 2001 123456789 Jim 6 30 2001 123456789 The output will be false. public class Person { private String name; private Date birthday; private int ssn; public Person(String name, Date birthday, int ssn) { this.name = name; this.birthday = birthday; this.ssn = ssn; } public

问题 I have the following wrapper script: #!/bin/bash $local_time=`date +%H%M` if [ $local_time -ge 1430 ] && [ $local_time -le 2230 ] || [ $local_time -ge 0300 ] && [ $local_time -le 0400 ] then echo 'pass' else echo 'skip' fi The idea being to create a wrapper script that runs a script between two disjoint time intervals. Each of the expressions being OR'd is evaluated correctly, however, when I OR both expressions, the test fails. How do I fix this? 回答1: You have two problems You don't prefix

问题 The following only wants a primitive boolean (true or false). psmt.setBoolean(5, boolean) ; //wants primitive What if I want to set the bit to null? Sql server = [bit] NULL 回答1: You could use setNull preparedStatement.setNull(5, Types.BOOLEAN); 来源： https://stackoverflow.com/questions/26184937/how-can-i-set-bit-column-to-null

问题 This question already has answers here : How to test if a string contains one of the substrings in a list, in pandas? (2 answers) Closed 4 months ago . Hello problem to loop over a column by searching a list of word then create a Boolean column if any of the list word searched is found. Here is my code # Code naf related to sport. code = ["3230Z","4764Z","7721Z","8551Z","9311Z", "9312Z", "9313Z", "9319Z", "9329Z", "364Z" "524W", "714B", "804C", "926A", "926C", "930L", "927C", "923K"] # check

问题 I'm trying to write a bit value (true or false) into my database in a field called "processed". i'm currently trying to do this by passing in bool values, but I get an error saying can't convert from type varchar to bit. Can anybody see what is going on in my logic? protected void CheckBoxProcess_CheckedChanged(object sender, EventArgs e) { bool update; bool trueBool = true; bool falseBool = false; string checkedString = "UPDATE SecureOrders SET processed = '%" + trueBool + "%' WHERE fName

问题 I'm trying to write a bit value (true or false) into my database in a field called "processed". i'm currently trying to do this by passing in bool values, but I get an error saying can't convert from type varchar to bit. Can anybody see what is going on in my logic? protected void CheckBoxProcess_CheckedChanged(object sender, EventArgs e) { bool update; bool trueBool = true; bool falseBool = false; string checkedString = "UPDATE SecureOrders SET processed = '%" + trueBool + "%' WHERE fName

问题 EDITED: Thanks for upvotes, now i finally added images. Added full m.file, although i don't think it wass necessary. The key of the code is. xp(2)=...-((x(2)>=X2)&(xp(3)>=0)...; xp(3)=...-((x(3)>=X3)&(xp(2)>=0))...; Full code: function xp=uzdevums1(t,x) %parametr values r1 = 0.1; r2 = 1; r3 = 0.2; K1=100;K2 = 100; K3 = 100; X2=25;X3=10; speedx2 = 0.02; speedx3=0.02; %ode system xp=zeros(3,1); xp(1)=r1*(1-x(1)/(x(2)+x(3)))*x(1); xp(2)=r2*(1-x(2)/K2)*x(2)-((x(2)>=X2)&(xp(3)>=0)&xp(1)>0)*x(2)*x