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What is the difference between & and && in Java?
... true , and the & operator is used to do Bit-wise operations on two integer types.
13 Answers
...
Python Pandas: Get index of rows which column matches certain value
...the index,
In [56]: idx = df.index[df['BoolCol']]
In [57]: idx
Out[57]: Int64Index([10, 40, 50], dtype='int64')
then you can select the rows using loc instead of iloc:
In [58]: df.loc[idx]
Out[58]:
BoolCol
10 True
40 True
50 True
[3 rows x 1 columns]
Note that loc can also ac...
Why is it impossible to build a compiler that can determine if a C++ function will change the value
... variable and 0 when the function doesn't. Then what should this program print?
int variable = 0;
void f() {
if (modifies_variable(f, variable)) {
/* do nothing */
} else {
/* modify variable */
variable = 1;
}
}
int main(int argc, char **argv) {
if (modifi...
How to sort with a lambda?
... have written so far makes little sense. If mProperty is supposed to be an int a.mProperty>b.mProperty will definitely yield a bool.
– sellibitze
Feb 26 '11 at 0:32
1
...
.gitignore for Visual Studio Projects and Solutions
...RIA/Silverlight projects
Generated_Code/
# Backup & report files from converting an old project file
# to a newer Visual Studio version. Backup files are not needed,
# because we have git ;-)
_UpgradeReport_Files/
Backup*/
UpgradeLog*.XML
UpgradeLog*.htm
# SQL Server files
*.mdf
*.ldf
# Busin...
Using [UIColor colorWithRed:green:blue:alpha:] doesn't work with UITableView seperatorColor?
... division by itself: (from http://github.com/Jon889/JPGeneral)
//.h file
@interface UIColor (JPExtras)
+ (UIColor *)colorWithR:(CGFloat)red G:(CGFloat)green B:(CGFloat)blue A:(CGFloat)alpha;
@end
//.m file
@implementation UIColor (JPExtras)
+ (UIColor *)colorWithR:(CGFloat)red G:(CGFloat)green B:(...
Java Generics (Wildcards)
... E, we can get elements out of the structure, but we cannot put
elements into the structure
List<Integer> ints = new ArrayList<Integer>();
ints.add(1);
ints.add(2);
List<? extends Number> nums = ints;
nums.add(3.14); // compile-time error
assert ints.toString().equals("[1, 2, 3...
what is the difference between const_iterator and iterator? [duplicate]
...here is no performance difference.
A const_iterator is an iterator that points to const value (like a const T* pointer); dereferencing it returns a reference to a constant value (const T&) and prevents modification of the referenced value: it enforces const-correctness.
When you have a const r...
What does java.lang.Thread.interrupt() do?
Could you explain what java.lang.Thread.interrupt() does when invoked?
9 Answers
9
...
Android – Listen For Incoming SMS Messages
...ces preferences;
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
if(intent.getAction().equals("android.provider.Telephony.SMS_RECEIVED")){
Bundle bundle = intent.getExtras(); //---get the SMS message...