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Writing a compiler in its own language
...s, specifically escape sequences. You will write code to convert \n to the character with the decimal code 10 (and \r to 13, etc).
After that compiler is ready, you will start to reimplement it in C. This process is called "bootstrapping".
The string parsing code will become:
...
if (c == 92) { /...
Ruby: How to get the first character of a string
How can I get the first character in a string using Ruby?
13 Answers
13
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Check if a string contains a string in C++
...lt;chrono>
std::string randomString( size_t len );
int main(int argc, char* argv[])
{
using namespace std::chrono;
const size_t haystacksCount = 200000;
std::string haystacks[haystacksCount];
std::string needle = "hello";
bool sink = true;
high...
How to find the size of localStorage
...ntil DevTools are opened)
Opera 12.15 ~4212ms /3.55Mb (this is when 5Mb is selected, but Opera asks nicely if we want increase the amount of lS, unfortunately it crashes if test conducted a few times in a row)
Win 8 (Under Parallels 8)
IE10 ~7850ms /9.54Mb
...
Does a method's signature in Java include its return type?
...ple:
public class Foo {
public int myMethod(int param) {}
public char myMethod(int param) {}
}
No, the compiler won't know the difference, as their signature: myMethod(int param) is the same. The second line:
public char myMethod(int param) {}
will give you can error: method is al...
How do I write a short literal in C++?
...
@Ates Goral: All ints. Changing to short or char would presumably change the instruction to movw or movb across the board.
– Mike F
Oct 16 '08 at 18:11
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Regular expression to match any character being repeated more than 10 times
I'm looking for a simple regular expression to match the same character being repeated more than 10 or so times. So for example, if I have a document littered with horizontal lines:
...
In .NET, which loop runs faster, 'for' or 'foreach'?
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Enumerable.Select has an overload that lets you obtain the index of the item, so even the need for an index does not mandate using for. See msdn.microsoft.com/en-us/library/bb534869.aspx
– TrueWill
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Random hash in Python
...question:
import random, string
def random_md5like_hash():
available_chars= string.hexdigits[:16]
return ''.join(
random.choice(available_chars)
for dummy in xrange(32))
I'm not saying it's faster or preferable to any other answer; just that it's another approach :)
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How do I check if a number is positive or negative in C#?
...
This is the industry standard:
int is_negative(float num)
{
char *p = (char*) malloc(20);
sprintf(p, "%f", num);
return p[0] == '-';
}
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