I want to evaluate one expression in C++. To evaluate it, I want the expression to be converted to prefix format.
Here is an example
wstring expression = "Feature1 And Feature2";
Here are possible ways.
expression = "Feature1 And (Feature2 Or Feature3)";
expression = "Not Feature1 Or Feature3";
Here And, Or, Not…
Hi.
I stumbled upon SQL behavior I don't understand. I needed to update several rows in a table at once; started with just finding them:
SELECT * FROM some_table WHERE field1 IN (SELECT ...)
This returned a selection of about 60 rows. Now I was pretty confident I got the subquery right, so I modified the first part…
Hi everyone,
I was playing with a macro to enable/disable traces when I came out with the following code when the macro is disabled:
int main
{
("Hello world");
}
This code is valid and I got the desired effect (nothing happens when the macro is disabled) but I couldn't figure out what exactly is happening. Is the…
I'm making a search-function in a Rails project with Postgres as db.
Here's my code
def self.search(search)
if search
find(:all, :conditions => ["LOWER(name) LIKE LOWER(?) OR LOWER(city) LIKE LOWER(?) OR LOWER(address) LIKE LOWER(?) OR (venue_type) LIKE (?)", "%#{search}%", "%#{search}%", "%#{search}%",…
While I am new to c and want help in this program
my code is :
#include<stdio.h>
#include<conio.h>
void main(){
int suite=2;
switch(suite) {
case 1||2:
printf("hi");
case 3:
printf("byee");
default:
printf("hello");
}
printf("I thought somebody");
getche();
}
I…
I have following two tables
LandParcels Table
Blockid ParcelNo storPri
======= ======== =======
52000105 3 State
52000105 4 Private
52000105 5 State
Actions Table
Blockid ParcelNo ActionTaken
======= ======== ===========
52000105 3 Received
52000105 3 Send to Computer
52000105 …
I have a question regarding the ||= statement in ruby and this is of particular interest to me as I'm using it to write to memcache. What I'm wondering is, does ||= check the receiver first to see if it's set before calling that setter, or is it literally an alias to x = x || y
This wouldn't really matter in the…
I want to compare the type of an object to a type to see if they are the same. I do not have the object, just the type of the object.
I can do type1 == type2 and get general equality
I can have a recursive loop where I repeat the above step for type1.BaseType until the BaseType is null.
I can do …
var_dump('<a>')
// or
var_dump("<a>")
// or
var_dump("\x3Ca>")
// all result in
string(3) ""
What is going on? Only putting a space after the less-than sign works for me.
PHP Version 5.2.10-2ubuntu6.4
Hey ppl,
I came across something weird today, and I was wondering if any of you here could explain what's happening...
Here's a sample:
#include <iostream>
#include <cassert>
using namespace std;
#define REQUIRE_STRING(s) assert(s != 0)
#define REQUIRE_STRING_LEN(s, n) …
I came across the following program and it behaving in unexpected manner.
public class ShiftProgram
{
public static void main(String[] args)
{
int i = 0;
while(-1 << i != 0)
i++;
System.out.println(i);
}
}
If we…
In my code here, I have a CSS class called "active" which I use if the $_GET['page'] == tutorials, php, mysql, etc...
The problem is, even if the 'page' variable is not equal to any of these values, the Tutorials button in this case is still active for some reason.
Any ideas why this would be…
Original formulation is given here (you can try also your program for correctness) .
Additional rules:
1. The program should read from standard input and write do standard output.
2. The program should return zero to the calling system/program.
3. The program should compile and run with gcc…
Here is my custom class that I have that represents a triangle. I'm trying to write code that checks to see if self.a, self.b, and self.c are greater than 0, which would mean that I have Angle, Angle, Angle.
Below you will see the code that checks for A and B, however when I use just self.a…
Following on from this question, which I have partially answered.
I compile this console app in x64 Release Mode, with optimizations on, and run it from the command line without a debugger attached.
using System;
using System.Diagnostics;
class Program
{
static void Main()
{
…
I have a templated sparse_vector<T> class, and I am also using Boost UBLAS. How would I provide implicit conversions between sparse_vector<double> and boost::numeric::ublas::compressed_vector<double>?
I would also like to provide similar conversions between…
Dumb question, but whenever you call new, do you always have a pointer?
SomeClass *person = new SomeClass();
And is that because you need a pointer to point to that new space of memory that was allocated for the SomeClass variable person? Thanks!
Could any one please tell me the meaning of "++" with array in the following code in Java:
int [ ] arr = new int[ 4 ];
for(int i = 0; i < arr.length; i++){
arr[ i ] = i + 1;
System.out.println(arr[ i ]++);
}
what is arr[ i ]++ meaning in above…
I'm trying to trim a few lines from a file. I know exactly how many lines to remove (say, 2 from the top), but not how many total lines are in the file. So I tried this straightforward solution:
$ wc -l $FILENAME
119559 my_filename.txt
$ LINES=$(wc -l $FILENAME | awk…
HEllo,
i try to do that in FlashBuilder (FlexProject)
protected function btn_detail_view_clickHandler(event:MouseEvent):void
{
CurrentState="Statistiques" || "PartMarche";
}
But it's not working, i guess this is not the right syntax but…
In ksh, I'd use
cd /usr/src/sys
How should I write it in Perl? A conversion such as
cd /usr/src/sys ---> chdir '/usr/src/sys'
Maybe the following would be better:
execute "chdir '/usr/src/sys' "