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What is the difference between user and kernel modes in operating systems?
...upt such as int 0x80 or syscall to signal the kernel. x86-64 Linux syscall hello world example:
.data
hello_world:
.ascii "hello world\n"
hello_world_len = . - hello_world
.text
.global _start
_start:
/* write */
mov $1, %rax
mov $1, %rdi
mov $hello_world, %rsi
mov $hell...
Java - No enclosing instance of type Foo is accessible
...r class, which (by definition) is associated with a particular instance of Hello (even if it never uses or refers to it), which means it's an error to say new Thing(); without having a particular Hello instance in scope.
If you declare it as a static class instead, then it's a "nested" class, whic...
Defining a function with multiple implicit arguments in Scala
...g, p1)
}
implicit val iString= " world! "
implicit val iInt= 2019
myFun("Hello").apply
myFun("Hello")(" my friend! ").apply
myFun("Hello")(" my friend! ")(2020)
// Output is:
// Hello world! 2019
// Hello my friend! 2019
// Hello my friend! 2020
In Scala 3 (a.k.a. "Dotty", thoug...
How can I have a newline in a string in sh?
...
The solution is to use $'string', for example:
$ STR=$'Hello\nWorld'
$ echo "$STR" # quotes are required here!
Hello
World
Here is an excerpt from the Bash manual page:
Words of the form $'string' are treated specially. The word expands to
string, with backslash-escaped...
What does “SyntaxError: Missing parentheses in call to 'print'” mean in Python?
...example or run a program that uses the Python 2 print statement:
print "Hello, World!"
The statement above does not work in Python 3. In Python 3 you need to add parentheses around the value to be printed:
print("Hello, World!")
“SyntaxError: Missing parentheses in call to 'print'” i...
What is the difference between the kernel space and the user space?
...upt such as int 0x80 or syscall to signal the kernel. x86-64 Linux syscall hello world example:
.data
hello_world:
.ascii "hello world\n"
hello_world_len = . - hello_world
.text
.global _start
_start:
/* write */
mov $1, %rax
mov $1, %rdi
mov $hello_world, %rsi
mov $hell...
What's the difference between echo, print, and print_r in PHP?
...a single string
Returns 1, so it can be used in an expression
e.g. print "Hello"
or, if ($expr && print "foo")
print_r()
Outputs a human-readable representation of any one value
Accepts not just strings but other types including arrays and objects, formatting them to be readable
Useful...
How to replace innerHTML of a div using jQuery?
...
$("#regTitle").html("Hello World");
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When monkey patching an instance method, can you call the overridden method from the new implementat
...possible, you should prefer something like this:
class Foo
def bar
'Hello'
end
end
class ExtendedFoo < Foo
def bar
super + ' World'
end
end
ExtendedFoo.new.bar # => 'Hello World'
This works, if you control creation of the Foo objects. Just change every place which creates...
How to disallow temporaries
... Foo (const char*) {}
};
void Foo (float);
int main ()
{
Foo ("hello"); // error
class Foo a("hi"); // OK
return 1;
}
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