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Marcello 2022-03-29 18:02:29 +02:00
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DotNet/C#/C#.md
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@ -634,17 +634,6 @@ The `Convert` type has a pair of methods, `ToBase64String` and `FromBase64String
The second most common conversion is from strings to numbers or date and time values. The second most common conversion is from strings to numbers or date and time values.
The opposite of `ToString` is `Parse`. Only a few types have a `Parse` method, including all the number types and `DateTime`. The opposite of `ToString` is `Parse`. Only a few types have a `Parse` method, including all the number types and `DateTime`.
## Random Numbers
```cs
using System.Random;
Random rand = new Random();
randomNumber = rand.Next(min, max_not_included);
randomNumber = rand.Next(max_not_included); // o to max_not_included
randomNumber = rand.Next(); // positive random number
randomNumber = rand.NextDouble(); // random number between 0.0 and 1.0
```
--- ---
## Preprocessor Directives ## Preprocessor Directives
@ -2812,24 +2801,6 @@ match.Groups[index].Index; // position in the input string of the matched group
--- ---
## Performance Tips
### Bit Tricks
```cs
(n & 1) == 0 // faster since modulo is "expensive"
//same as
n % 2 == 0
n >> m
// same as
n / 2^m
n << m
// same as
n * 2^m
```
## Unsafe Code & Pointers ## Unsafe Code & Pointers
The `unsafe` keyword denotes an *unsafe context*, which is required for any operation involving pointers. The `unsafe` keyword denotes an *unsafe context*, which is required for any operation involving pointers.