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Objective-C formatting string for boolean?
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In Objective-C, the BOOL type is just a signed char. From <objc/objc.h>:
typedef signed char BOOL;
#define YES (BOOL)1
#define NO (BOOL)0
So you can print them using the %d formatter But that will only print a 1 or a 0, not YES or NO.
Or you can just use a ...
Please explain the exec() function and its family
... there are certain restrictions in what the child can do, and the parent halts until the child calls exec() or _exit().
The parent has to be stopped (and the child is not permitted to return from the current function) since the two processes even share the same stack. This is slightly more efficient...
Looping over arrays, printing both index and value
...mp bash arrays or associative arrays I use
This one line command:
paste <(printf "%s\n" "${!foo[@]}") <(printf "%s\n" "${foo[@]}")
Will render:
12 bar
35 baz
42 foo bar baz
Explained
printf "%s\n" "${!foo[@]}" will print all keys separated by a newline,
printf "%s\n" "${foo[@]}" ...
Difference between a theta join, equijoin and natural join
... Product
JOIN Component
ON Product.Pname = Component.Pname
and the result:
| PNAME | PRICE | CNAME | COST |
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| Laptop | 1500 | CPU | 500 |
| Laptop | 1500 | hdd | 300 |
| Laptop | 1500 | case | 700 |
| Car | 20000 | wheels | 1000 |
Notice ...
What's the fuss about Haskell? [closed]
...roblems in different ways: instead of loops, think in maps and folds and filters, etc. In general, if you have more than one perspective on a problem, it makes you better enabled to reason about this problem, and switch viewpoints as necessary.
The other really neat thing about Haskell is its type ...
How to set UICollectionViewDelegateFlowLayout?
...ins a reference to a UICollectionView. The controller should modify the built-in flow layout using the UICollectionViewDelegateFlowLayout.
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Format in kotlin string templates
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Unfortunately, there's no built-in support for formatting in string templates yet, as a workaround, you can use something like:
"pi = ${pi.format(2)}"
the .format(n) function you'd need to define yourself as
fun Double.format(digits: Int) = "%.${digi...
Should MySQL have its timezone set to UTC?
Follow up question of
https://serverfault.com/questions/191331/should-servers-have-their-timezone-set-to-gmt-utc
4 Answers...
How can I handle R CMD check “no visible binding for global variable” notes when my ggplot2 syntax i
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Have you tried with aes_string instead of aes? This should work, although I haven't tried it:
aes_string(x = 'x.values', y = 'y.values')
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How can I use “:” as an AWK field separator?
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You have multiple ways to set : as the separator:
awk -F: '{print $1}'
awk -v FS=: '{print $1}'
awk '{print $1}' FS=:
awk 'BEGIN{FS=":"} {print $1}'
All of them are equivalent and will return 1 given a sample input "1:2:3":
$ awk -F...