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How to check if a string contains only digits in Java [duplicate]
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You can also use NumberUtil.isNumber(String str) from Apache Commons
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Is it better to use std::memcpy() or std::copy() in terms to performance?
...ns. However, after my first few attempts, I got results that varied wildly from one run to the next, so I'm guessing there was some sort of OS activity going on. I decided to start over.
Same compiler settings and flags. There is only one version of MD5, and it's faster than SHA-2, so I did 3000 lo...
Hidden features of Ruby
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From Ruby 1.9 Proc#=== is an alias to Proc#call, which means Proc objects can be used in case statements like so:
def multiple_of(factor)
Proc.new{|product| product.modulo(factor).zero?}
end
case number
when multiple_of...
How to implement an android:background that doesn't stretch?
...then you will need to force the scaling in the button to prevent the image from stretching.
Code:
onCreate(Bundle bundle) {
// Set content layout, etc up here
// Now adjust button sizes
Button b = (Button) findViewById(R.id.somebutton);
int someDimension = 50; //50pixels
b.setWidth(some...
stringstream, string, and char* conversion confusion
My question can be boiled down to, where does the string returned from stringstream.str().c_str() live in memory, and why can't it be assigned to a const char* ?
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What Computer Science concepts should I know? [closed]
...s are often directed to Perl hackers, I think any programmer would benefit from his clear presentation and real code, especially in Higher Order Perl.
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Hash Map in Python
...user for an input. depending on his input I am retrieving some information from the HashMap. If the user enters a key of the HashMap, I would like to retrieve the corresponding value.
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Removing white space around a saved image in matplotlib
... may even have modify this to keep fat lines near the limits of the figure from being shaved by the lack of margins.
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OwinStartup not firing
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Trying to create an application from scratch, without using the MVC template. This ended 2 hours despair.
– mkvlrn
Jan 24 '15 at 14:05
1
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Are C++ enums signed or unsigned?
...3 Enum type is a distinct type of its own having no concept of sign. Since from C++03 standard dcl.enum
7.2 Enumeration declarations
5 Each enumeration defines a type that is different from all other types....
So when we are talking about the sign of an enum type, say when comparing 2 enum opera...