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How to remove single character from a String
...other mutator methods.
Just delete the characters that you need to delete and then get the result as follows:
String resultString = sb.toString();
This avoids creation of unnecessary string objects.
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How to convert timestamps to dates in Bash?
I need a shell command or script that converts a Unix timestamp to a date. The input can come either from the first parameter or from stdin, allowing for the following usage patterns:
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How to check if command line tools is installed
...as it appears in the Applications directory.
There are also the xcodebuild and xcode-select files in /usr/bin
I need to know if the command line tools is installed.
Is there a command for it?
What can I do to see if XCode CLT is installed and if yes to find the version installed?
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How to get numbers after decimal point?
...On a Raspberry Pi this method x%1 was almost twice as fast as the x-int(x) and modf(x)[0] methods (the timings were 980ns, 1.39us, and 1.47us averaged over 1000000 runs). My value for x was always positive so I did not have to worry about that.
– coderforlife
J...
What is the difference between exit and return? [duplicate]
What is difference between return and exit statement in C programming when called from anywhere in a C program?
4 Answers
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Swift 编程语言入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...tive-C的命名参数和动态对象模型。提供了对Cocoa框架和mix-and-match的互操作性。基于这些基础，Swift引入了很多新功能和结合面向过程和面向对象的功能。
Swift对新的程序员也是友好的。他是工业级品质的系统编程语言，却又像脚...
check if a std::vector contains a certain object? [duplicate]
...erator==. If you need to account for numerical tolerance, use std::find_if and supply a suitable predicate.
– You
Aug 20 '15 at 18:38
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Show filename and line number in grep output
... to search my rails directory using grep. I am looking for a specific word and I want to grep to print out the file name and line number.
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What's the purpose of the LEA instruction?
For me, it just seems like a funky MOV. What's its purpose and when should I use it?
16 Answers
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Get the current time in C
...);
timeinfo = localtime ( &rawtime );
printf ( "Current local time and date: %s", asctime (timeinfo) );
return 0;
}
(just add "void" to the main() arguments list in order for this to work in C)
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