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Why should casting be avoided? [closed]
... compiler won't warn you about those potential problems. Just for example, char a=(char)123456;. The exact result of this implementation defined (depends on the size and signedness of char), and except in rather strange situations, probably isn't useful. C casts also vary in whether they're somethin...
How to convert an Int to a String of a given length with leading zeros to align?
How can I convert an Int to a 7-character long String , so that 123 is turned into "0000123" ?
7 Answers
...
Avoiding if statement inside a for loop?
... f(index++, e);
}
int main() {
using namespace std;
set<char> s{'b', 'a', 'c'};
// indices starting at 1 instead of 0
for_each_indexed(s, [](size_t i, char e) { cout<<i<<'\t'<<e<<'\n'; }, 1u);
cout << "-----" << endl;
vecto...
Quickly reading very large tables as dataframes
...ontain any column headers or row names, and does not have any pathological characters that I have to worry about.
11 Answer...
How to profile a bash shell script slow startup?
...n of any Bash script you'd like tracing to stop). The \011 is an octal tab character.
You should get a trace log in /tmp/bashstart.PID.log that shows the seconds.nanoseconds timestamp of each command that was executed. The difference from one time to the next is the amount of time that the interven...
In what cases do I use malloc and/or new?
... Always use new.
If you need a big chunk of data just do something like:
char *pBuffer = new char[1024];
Be careful though this is not correct:
//This is incorrect - may delete only one element, may corrupt the heap, or worse...
delete pBuffer;
Instead you should do this when deleting an arra...
git ignore vim temporary files
...ension to find another file that can be used.
* First decrement the last char: ".swo", ".swn", etc.
* If that still isn't enough decrement the last but one char: ".svz"
* Can happen when editing many "No Name" buffers.
*/
if (fname[n - 1] == 'a') /* ".s?a" */
{
if (fname[n - 2]...
Simple Digit Recognition OCR in OpenCV-Python
...To(tmp2,CV_32FC1);
float p=knn.find_nearest(tmp2.reshape(1,1), 1);
char name[4];
sprintf(name,"%d",(int)p);
putText( dst,name,Point(r.x,r.y+r.height) ,0,1, Scalar(0, 255, 0), 2, 8 );
}
imshow("src",src);
imshow("dst",dst);
imwrite("dest.jpg",dst);
waitKey();
Result
In the result ...
How do I find the width & height of a terminal window?
... wrapper for that. E.g in Perl you can use Term::Size:
use Term::Size qw( chars );
my ( $columns, $rows ) = chars \*STDOUT;
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Is there a minlength validation attribute in HTML5?
...from constraint validation.
<input pattern=".{3,}" required title="3 characters minimum">
<input pattern=".{5,10}" required title="5 to 10 characters">
If you want to create the option to use the pattern for "empty, or minimum length", you could do the following:
<input pattern=...