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Fastest way to determine if an integer's square root is an integer
...,1555,615,1931,
1343,445,937,1083,1617,883,185,1515,225,1443,1225,869,1423,1235,39,1973,
769,259,489,1797,1391,1485,1287,341,289,99,1271,1701,1713,915,537,1781,
1215,963,41,581,303,243,1337,1899,353,1245,329,1563,753,595,1113,1589,
897,1667,407,635,785,1971,135,43,417,1507,1929,731,207,275,1689,1397...
How should I use try-with-resources with JDBC?
... = new PreparedStatementWrapper(con, query,
new Object[] { 123L, "TEST" }) {
@Override
protected void prepareStatement(Object... params) throws SQLException {
stat.setLong(1, Long.class.cast(params[0]));
stat.setString(2, String...
What's the fastest way to merge/join data.frames in R?
...bases as well.
library(plyr)
library(data.table)
library(sqldf)
set.seed(123)
N <- 1e5
d1 <- data.frame(x=sample(N,N), y1=rnorm(N))
d2 <- data.frame(x=sample(N,N), y2=rnorm(N))
g1 <- sample(1:1000, N, replace = TRUE)
g2<- sample(1:1000, N, replace = TRUE)
d <- data.frame(d1, g1,...
How Pony (ORM) does its tricks?
...
@randomsurfer_123 probably not, we just need some time to implement it (maybe a week), and there are other tasks that are more important to us.
– Alexander Kozlovsky
Mar 18 '16 at 10:43
...
Reference: Comparing PHP's print and echo
...
echo 125;
ECHO 125
multi-value echo compiles to multiple opcodes
echo 123, 456;
ECHO 123
ECHO 456
Note that multi-value echo doesn't concatenate its arguments, but outputs them one-by-one.
Reference: zend_do_print, zend_do_echo.
Runtime differences
ZEND_PRINT is implemented as follows (ps...
Regex that accepts only numbers (0-9) and NO characters [duplicate]
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In Javascript this is allowing the value 123-456 (\d)*$
– theB3RV
Feb 20 '17 at 15:39
...
C# convert int to string with padding zeros?
...
Simply
int i=123;
string paddedI = i.ToString("D4");
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In Java, what is the best way to determine the size of an object?
...
123
You should use jol, a tool developed as part of the OpenJDK project.
JOL (Java Object Layo...
c语言编程中%g是什么格式？ - C/C++ - 清泛网 - 专注C/C++及内核技术
...科学记数法还是一般的小数记数法。
printf("%g\n", 0.00001234); //输出结果：1.234e-05
printf("%g\n", 0.0001234); //输出结果：0.0001234
printf("%.2g\n", 123.45); //输出结果：1.2e+02
printf("%.2g\n", 23.45); //输出结果：23
对于指数小于-4或者大...
C#中数组、ArrayList和List三者的区别 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...
list.RemoveAt(0);
上例中，如果我们往List集合中插入int数组123，IDE就会报错，且不能通过编译。这样就避免了前面讲的类型安全问题与装箱拆箱的性能问题了。
总结：
数组的容量是固定的，您只能一次获取或设置一个元素的值...