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How does this program work?
...g to print the float.
On why 0 is printed: The floating point number is converted to double before sending to printf. The number 1234.5 in double representation in little endian is
00 00 00 00 00 4A 93 40
A %d consumes a 32-bit integer, so a zero is printed. (As a test, you could printf("%d, ...
Stop pip from failing on single package when installing with requirements.txt
...
For Windows:
pip version >=18
import sys
from pip._internal import main as pip_main
def install(package):
pip_main(['install', package])
if __name__ == '__main__':
with open(sys.argv[1]) as f:
for line in f:
install(line)
pip vers...
How to import a module given its name as string?
... can import a list of modules by doing this:
>>> moduleNames = ['sys', 'os', 're', 'unittest']
>>> moduleNames
['sys', 'os', 're', 'unittest']
>>> modules = map(__import__, moduleNames)
Ripped straight from Dive Into Python.
...
Grant execute permission for a user on all stored procedures in database?
...call grant execute on the new stored procedure:
IF EXISTS (SELECT * FROM sys.database_principals WHERE name = N'asp_net')
DROP USER asp_net
GO
IF EXISTS (SELECT * FROM sys.database_principals
WHERE name = N'db_execproc' AND type = 'R')
DROP ROLE [db_execproc]
GO
--Create a database role....
CR...
What is the meaning of “POSIX”?
...ified by the IEEE, to clarify and make uniform the application programming interfaces (and ancillary issues, such as commandline shell utilities) provided by Unix-y operating systems. When you write your programs to rely on POSIX standards, you can be pretty sure to be able to port them easily amon...
How do you set your pythonpath in an already-created virtualenv?
...e it in the site-packages directory. E.g.:
cd $(python -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())")
echo /some/library/path > some-library.pth
The effect is the same as adding /some/library/path to sys.path, and remain local to the virtualenv setup.
...
How does the String class override the + operator?
...simple expressions in Java
int x=15;
String temp="x = "+x;
The compiler converts "x = "+x; into a StringBuilder internally and uses .append(int) to "add" the integer to the string.
5.1.11. String Conversion
Any type may be converted to type String by string conversion.
A value x of pri...
In Clojure how can I convert a String to a number?
I have various strings, some like "45", some like "45px". How how I convert both of these to the number 45?
12 Answers
...
Division of integers in Java [duplicate]
...
Converting the output is too late; the calculation has already taken place in integer arithmetic. You need to convert the inputs to double:
System.out.println((double)completed/(double)total);
Note that you don't actually...
Hash and salt passwords in C#
...em into config files. Hashes and salts are binary blobs, you don't need to convert them to strings unless you want to put them into text files.
In my book, Beginning ASP.NET Security, (oh finally, an excuse to pimp the book) I do the following
static byte[] GenerateSaltedHash(byte[] plainText, by...