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Fast Linux File Count for a large number of files
...s:
#include <stdio.h>
#include <dirent.h>
int main(int argc, char *argv[]) {
DIR *dir;
struct dirent *ent;
long count = 0;
dir = opendir(argv[1]);
while((ent = readdir(dir)))
++count;
closedir(dir);
printf("%s contains %ld files\n", argv[1], ...
C++ equivalent of StringBuffer/StringBuilder?
...As far as I know std::string cannot simply extend the size of its internal char*. That means mutating it in a way which requires more characters requires a reallocation and copying. It's no different than a vector of chars and it is certainly better to reserve the space you need in that case.
...
Useful GCC flags for C
...the required alignment of the target is increased. For example, warn if a char * is cast to an int * on machines where integers can only be accessed at two- or four-byte boundaries.
-Wstrict-prototypes: warn if a function is declared or defined without specifying the argument types.
-Wstrict-overfl...
How to merge 2 List and removing duplicate values from it in C#
...excludes duplicates from the return set. This is different
behavior to the Concat
method, which returns all the elements
in the input sequences including
duplicates.
List<int> list1 = new List<int> { 1, 12, 12, 5};
List<int> list2 = new List<int> { 12, 5, 7, 9, 1 };
List<...
How to generate gcc debug symbol outside the build target?
...
Refer @Lance Richardson answer comments for an example.
– GuruM
Jul 19 '13 at 11:02
7
...
How to check if a string in Python is in ASCII?
...so, then the original string is ASCII.
def isascii(s):
"""Check if the characters in string s are in ASCII, U+0-U+7F."""
return len(s) == len(s.encode())
To check, pass the test string:
>>> isascii("♥O◘♦♥O◘♦")
False
>>> isascii("Python")
True
...
How to view the assembly behind the code using Visual C++?
...C++ -> Output Files -> ASM List Location and fill in file name. Also select "Assembly Output" to "Assembly With Source Code".
Compile the program and use any third-party debugger. You can use OllyDbg or WinDbg for this. Also you can use IDA (interactive disassembler). But this is hardcore way ...
What is the maximum length of a Push Notification alert text?
...me experiments.
Alerts: Prior to iOS 7, the alerts display limit was 107 characters. Bigger messages were truncated and you would get a "..." at the end of the displayed message. With iOS 7 the limit seems to be increased to 235 characters. If you go over 8 lines your message will also get truncat...
How to sort a dataFrame in python pandas by two or more columns?
... pd.DataFrame(np.random.randint(1, 5, (10,2)), columns=['a','b'])
df1 = pd.concat([df1]*100000)
def pdsort(df1):
return df1.sort_values(['a', 'b'], ascending=[True, False])
def lex(df1):
arr = df1.values
return pd.DataFrame(arr[np.lexsort((-arr[:, 1], arr[:, 0]))])
assert (pdsort(df1)...
Divide a number by 3 without using *, /, +, -, % operators
...* fp=fopen("temp.dat","w+b");
int number=12346;
int divisor=3;
char * buf = calloc(number,1);
fwrite(buf,number,1,fp);
rewind(fp);
int result=fread(buf,divisor,number,fp);
printf("%d / %d = %d", number, divisor, result);
free(buf);
fclose(fp);
return 0;
}
If...