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Divide a number by 3 without using *, /, +, -, % operators
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Use itoa to convert to a base 3 string. Drop the last trit and convert back to base 10.
// Note: itoa is non-standard but actual implementations
// don't seem to handle negative when base != 10.
int div3(int i) {
char str[42];
s...
How to check if a python module exists without importing it
... but the eggs package could be found.
See the documentation of the import system for more info on the ModuleNotFoundError
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Find index of last occurrence of a sub-string using T-SQL
...create function fnLastIndexOf(@text varChar(max),@char varchar(1))
returns int
as
begin
return len(@text) - charindex(@char, reverse(@text)) -1
end
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How do I get the color from a hexadecimal color code using .NET?
...re looking for it:
using System.Windows.Media;
Color color = (Color)ColorConverter.ConvertFromString("#FFDFD991");
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Convert System.Drawing.Color to RGB and Hex Value
...ld clean the whole thing up using the following:
private static String HexConverter(System.Drawing.Color c)
{
return "#" + c.R.ToString("X2") + c.G.ToString("X2") + c.B.ToString("X2");
}
private static String RGBConverter(System.Drawing.Color c)
{
return "RGB(" + c.R.ToString() + "," + c.G...
Using R to list all files with a specified extension
... so it will only pick out the file names that end in .dbf
filenames <- Sys.glob("*.dbf")
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Why do function pointer definitions work with any number of ampersands '&' or asterisks '*'?
...l reason why all of these work is that a function (like foo) is implicitly convertible to a pointer to the function. This is why void (*p1_foo)() = foo; works: foo is implicitly converted into a pointer to itself and that pointer is assigned to p1_foo.
The unary &, when applied to a function,...
Can we make unsigned byte in Java
I am trying to convert a signed byte in unsigned. The problem is the data I am receiving is unsigned and Java does not support unsigned byte, so when it reads the data it treats it as signed.
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Most efficient conversion of ResultSet to JSON?
The following code converts a ResultSet to a JSON string using JSONArray and JSONObject .
14 Answers
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How to modify a text file?
... beginning or the middle, you'll have to rewrite it.
This is an operating system thing, not a Python thing. It is the same in all languages.
What I usually do is read from the file, make the modifications and write it out to a new file called myfile.txt.tmp or something like that. This is better t...