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Using two values for one switch case statement
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class SwitchDemo {
public static void main(String[] args) {
int month = 2;
int year = 2000;
int numDays = 0;
switch (month) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
c...
How to do ToString for a possibly null object?
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It would be great if Convert.ToString() had a proper overload for this.
There's been a Convert.ToString(Object value) since .Net 2.0 (approx. 5 years before this Q was asked), which appears to do exactly what you want:
http://msdn.microsoft.co...
How to escape JSON string?
...s = JsonConvert.ToString(@"a\b");
Console.WriteLine(s);
....
This code prints:
"a\\b"
That is, the resulting string value contains the quotes as well as the escaped backslash.
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improve th...
Count character occurrences in a string in C++
...heck if c equals '_'
If yes, increase count
EDIT: C++ example code:
int count_underscores(string s) {
int count = 0;
for (int i = 0; i < s.size(); i++)
if (s[i] == '_') count++;
return count;
}
Note that this is code to use together with std::string, if you're using char*, re...
What is 'Pattern Matching' in functional languages?
...-like functional languages allow you define simple data types called "disjoint unions" or "algebraic data types". These data structures are simple containers, and can be recursively defined. For example:
type 'a list =
| Nil
| Cons of 'a * 'a list
defines a stack-like data structure. Thin...
For every character in string
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A for loop can be implemented like this:
string str("HELLO");
for (int i = 0; i < str.size(); i++){
cout << str[i];
}
This will print the string character by character. str[i] returns character at index i.
If it is a character array:
char str[6] = "hello";
for (int i = 0; st...
Why can lambdas be better optimized by the compiler than plain functions?
...l.
For functions, on the other hand, the old caveat applies: a function pointer gets passed to the function template, and compilers traditionally have a lot of problems inlining calls via function pointers. They can theoretically be inlined, but only if the surrounding function is inlined as well.
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Saving a Numpy array as an image
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Be careful when converting to jpg since it is lossy and so you may not be able to recover the exact data used to generate the image.
– Feanil
Dec 20 '12 at 15:20
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What are these ^M's that keep showing up in my files in emacs?
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In git-config, set core.autocrlf to true to make git automatically convert line endings correctly for your platform, e.g. run this command for a global setting:
git config --global core.autocrlf true
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Test if string is a number in Ruby on Rails
...ited Jul 3 '15 at 11:44
Joshua Pinter
34k1717 gold badges188188 silver badges208208 bronze badges
answered Apr 14 '11 at 10:13
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