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When should I use nil and NULL in Objective-C?
...ke a C pointer) in Objective-C. Like nil , NULL got no value nor address.
char *myChar = NULL;
struct MyStruct *dStruct = NULL;
So if there is a situation, when I need to check my struct (structure type variable) is empty or not then, I will use:
if (dStruct == NULL)
NSLog("The struct is emp...
Display two files side by side
....txt does a better job than paste one.txt two.txt and removing diffs extra chars that are displayed with sed is trivial comparing with writing/remembering an awk script. Even with both as functions in .bash_rc longer != better, more readable, faster.. what is the advantage here?
...
Generate a random alphanumeric string in Cocoa
...i=0; i<len; i++) {
[randomString appendFormat: @"%C", [letters characterAtIndex: arc4random_uniform([letters length])]];
}
return randomString;
}
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...
Create a .txt file if doesn't exist, and if it does append a new line
... answered Jan 31 '18 at 19:38
R.ChaR.Cha
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get string value from HashMap depending on key name
...
Suppose you declared HashMap as :-
HashMap<Character,Integer> hs = new HashMap<>();
Then,key in map is of type Character data type and value of int type.Now,to get value corresponding to key irrespective of type of key,value type, syntax is :-
char tem...
How to convert a currency string to a double with jQuery or Javascript?
... To handle negative numbers in the string, I added a '-' to the list of chars to accept, i.e. .replace(/[^0-9-\.]+/g, "")
– tonycoupland
Nov 27 '13 at 13:28
4
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Standard deviation of a list
... would expect. I couldn't edit the post as edits need to modify at least 6 chars...
– mknaf
Jan 6 '17 at 16:00
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Efficiently convert rows to columns in sql server
...ou can use the PIVOT function to transform the data from rows to columns:
select Firstname, Amount, PostalCode, LastName, AccountNumber
from
(
select value, columnname
from yourtable
) d
pivot
(
max(value)
for columnname in (Firstname, Amount, PostalCode, LastName, AccountNumber)
) piv;
S...
Remove carriage return in Unix
...many shells on many terminals, ctrl-V ctrl-M will produce a literal ctrl-M character).
– tripleee
Aug 25 '14 at 10:55
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In Bash, how do I add a string after each line in a file?
... @shuhalo According to gnu sed documentation $ also acts as a special character only at the end of the regular expression. So $ regexp grabs the end of each line and s/$/appendix/ substitues the end of a line with a given string. This is my understanding.
– Azatik1000
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