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How can I safely encode a string in Java to use as a filename?

...If collisions must be avoided, then simple replacement or removal of "bad" characters is not the answer either. Instead you want something like this. (Note: this should be treated as an illustrative example, not something to copy and paste.) char fileSep = '/'; // ... or do this portably. char es...
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Convert array of integers to comma-separated string

...= new int[5] {1,2,3,4,5}; You can use Linq for it String arrTostr = arr.Select(a => a.ToString()).Aggregate((i, j) => i + "," + j); share | improve this answer | fo...
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What is std::string::c_str() lifetime?

...programs, I have to interface with some legacy code that works with const char* . 7 Answers ...
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Concept of void pointer in C programming

...l incorrectly, you can safely dereference a void* in two ways. Casting to char* is always acceptable, and if you know the original type it points to you can cast to that type. The void* has lost the type info so it'd have to be stored elsewhere. – Dan Olson M...
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Method Syntax in Objective-C

...ersonData) for setting some information about person: void setPersonData( char* name, int age, float height ) { and in Objective-C the method would be more descriptive (setPersonName:andAge:andHeight:), like - (void) setPersonName: (char *)name andAge:(int)age andHeight:(float)height { ...
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Convert UTF-8 encoded NSData to NSString

...ver and I want to convert it to NSString for iPhone. Since data contains characters (like a degree symbol) which have different values on both platforms, how do I convert data to string? ...
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What's the difference between a file descriptor and file pointer?

...LE Structure returned by fopen typedef struct { unsigned char *_ptr; int _cnt; unsigned char *_base; unsigned char *_bufendp; short _flag; short _file; int __stdioid; char *__newbase; #ifdef _THREAD_SAFE ...
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How to get rid of punctuation using NLTK tokenizer?

...ample, you can define a tokenizer that picks out sequences of alphanumeric characters as tokens and drops everything else: from nltk.tokenize import RegexpTokenizer tokenizer = RegexpTokenizer(r'\w+') tokenizer.tokenize('Eighty-seven miles to go, yet. Onward!') Output: ['Eighty', 'seven', 'mil...
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Difference between a Structure and a Union

...re that value. union foo { int a; // can't use both a and b at once char b; } foo; struct bar { int a; // can use both a and b simultaneously char b; } bar; union foo x; x.a = 3; // OK x.b = 'c'; // NO! this affects the value of x.a! struct bar y; y.a = 3; // OK y.b = 'c'; // OK ed...
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Are there any downsides to passing structs by value in C, rather than passing a pointer?

...e output parameters be listed first before input parameters, e.g. int func(char* out, char *in); – zooropa Apr 29 '09 at 12:29 ...