add | 易学教程

add hours:min:sec to date in PHP

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问题 I am trying to add hh:mm:ss with the date. How can i do it? I tried with the following but it works when the hour is string, but when adding time is similar to MySQL Date time it is not working. $new_time = date("Y-m-d H:i:s", strtotime('+5 hours')); I am trying to get solution for the following: $timeA= '2015-10-09 13:40:14'; $timeB = '03:05:01'; // '0000-00-00 03:05:01' OutPut: $timeA + $timeB = 2015-10-09 16:45:15 ? How Can I Add this? 回答1: Use DateInterval(): $timeA = new DateTime('2015

Is there a way to make this function faster? (C)

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问题 I have a code in C which does additions in the same way as a human does, so if for example I have two arrays A[0..n-1] and B[0..n-1] , the method will do C[0]=A[0]+B[0] , C[1]=A[1]+B[1] ... I need help in making this function faster, even if the solution is using intrinsics. My main problem is that I have a really big dependency problem, as the iteration i+1 depends on the carry of the iteration i , as long as I use base 10. So if A[0]=6 and B[0]=5 , C[0] must be 1 and I have a carry of 1 for

Python: add and +, different behavior with float and integer

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问题 When adding an integer value to a float value, I realized that __add__ method is working fine if called on float, such as this: >>> n = 2.0 >>> m = 1 >>> n.__add__(m) 3.0 but not if called on an integer: >>> m.__add__(n) NotImplemented At first I thought that __add__ was just being implemented differently for int and float types (like float types accepting to be added to int types, but not the opposite). Then I noticed that everything works fine if I use the + operator instead: >>> n + m 3.0

add to support addition of different types?

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问题 Would be very easy to solve had python been a static programming language that supported overloading. I am making a class called Complex which is a representation of complex numbers (I know python has its own, but i want to make one myself), where a is the real number and b is the imaginary ( Complex(a, b) ). It should support adding Complex instances together ( Complex(2, 4) + Complex(4, 5) = Complex(6, 9) ), as well as adding an integer ( Complex(2, 3) + 4 = Complex(6, 3) ). However, due to

How can I add an int (minutes) to LocalDateTime.now()?

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问题 I want to modify LocalDateTime.now() by adding a certain amount of minutes to it. How do I do that? 回答1: If you are using java 8 then you can still use the same syntax LocalDateTime fiveMinutesLater = LocalDateTime.now().plusMinutes(5) 来源： https://stackoverflow.com/questions/30374796/how-can-i-add-an-int-minutes-to-localdatetime-now

oracle table space add

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oracle table space add ORA-01653: unable to extend table xxxxxxx by 32 in tablespace xxxxxxxxxx 解决方法添加空间： ust add a new datafile for the existing tablespace ALTER TABLESPACE LEGAL_DATA ADD DATAFILE ‘/u01/oradata/ userdata03. dbf’ SIZE 200M; To find out the location and size of your data files: SELECT FILE_NAME, BYTES FROM DBA_DATA_FILES WHERE TABLESPACE_NAME = 'LEGAL_DATA'; Are the spaces intended? I adjusted the path to my needs, but left the spaces in, so I ended up with: ALTER TABLESPACE SYSTEM ADD DATAFILE ‘/usr/lib/oracle/oradata/XE/ userdata03. dbf’ SIZE 200M; The file in my filesystem

How to subtract or add two hexadecimal value in java

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问题 Is there a way of calculating two hexadecimal value without converting it to int? for example: String sHex = "f7c0"; String bHex = "040000000"; 回答1: Hexadecimal values are integers - just represented in hex instead of decimal. Can't you just do this? int sHex = 0xf7c0; int bHex = 0x040000000; If not, then you actually meant: String sHex = "f7c0"; String bHex = "040000000"; In which case, the fastest way to do this is still by converting them to integers, using something like Integer.parseInt

How to subtract or add two hexadecimal value in java

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How to add rows of zeroes in matrices/excel spreadsheet with code (MATLAB)?

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问题 I made this program were the user can type in a year between 2009 and 2011 and get snow depth and air temperature data for the chosen year displayed on a graph. I have one xls file for the temperature for each day from day 1 to day 365. I also have another xls file for snow depth from day 1 to day 212. So some days they didn't bother to measure snow depth because it was summer anyways. Between 30. april to 1. october they didn't measure snow depth. I want to add 153 zeroes with code between

How to add rows of zeroes in matrices/excel spreadsheet with code (MATLAB)?

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