print hashtable in c

As @owenss mentioned, line 53, hashval has not been initialized. There's some really excellent commentary here. That's the flirting-with-your-girlfriends-sister version of academic misconduct. (Full disclosure: I would Yes, this actually happened. A hash table is a collection of key/value pairs that are stored based on the hash code of the key in the collection. For any of the keys  static void Main(string[] args) { System.Collections.Hashtable htable = new System.Collections.Hashtable(); htable.Add("MyName", "WindyCityEagle"); htable.Add("MyAddress", "Here"); htable.Add(new Guid(), "That Was My Guid"); int loopCount = 0; foreach (string s in htable.Keys) { Console.WriteLine(loopCount++.ToString()); Console.WriteLine(htable[s]); } }, C# Hashtable (With Examples), You can retrieve the value of an existing key from the Hashtable by passing a key in indexer. FWIW, I have a gameboy zero build that I really like, but emulation station really is too heavy for the way I use it. I've learned a lot from it. I didn't write a release function, as this was never intended to be anything more than a toy. @tonious what is the purpose of typedefing the entry_s and hashtable_s structs to entry_t & hashtable_t ? Currently your logic tries to: Why not simply, find if the key already exists, and if it doesn't, add a new key/value pair as the first element of that bin? The Hashtable class represents a collection of key-and-value pairs that are organized based on the hash code of the key. At this point since you have added a keyLength member to your entries... You can validate your keys by testing the key lengths FIRST, then if equal, perform a memcmp and check explicitly for ZERO return value. Additionally, if this is not a fantastic implementation to use (needs more error checking, etc), what would you recommend that is similarly lightweight? Install it, then check for leaks using valgrind -q --leak-check=full ./hash. This was a quick code kata I wrote almost seven years ago. Any strings set with the same prefix/suffix will trash your hash. Would it make is much more compliacted in calculating the keys-to-hashes? I did, for a client who uses it only internally. Notes, Hashtable. This is because any way you take at the end the computed value modulo hashtable->size. And thanks @tonious, this really cleared up some questions I had about hash tables. The declaration of a Hashtable is shown below. The idea being that 'beef' and 'beefstake' should both end up in the same bin. It optimizes lookups by computing the hash code of each key and stores it in a different bucket internally and then matches the hash code of the specified key at the time of accessing values. thanks. If you're going to use this in any kind of a production setting, I'd find something with a long usage history, or a complete set of unit tests, or ideally, both. Being a little further on in my career, I think I'd start with a test suite and build backwards. As is, next could imply a verb or a noun which gives rise to much potential confusion. The java.util.Hashtable.toString() is an inbuilt method of Hashtable that is used to get a string representation of the objects of Hashtable in the form of a set of entries separated by “, “. It then uses this hash code to look up the element very quickly. The Hashtable is a non-generic collection, so you must type cast  Hashtable numberNames = new Hashtable (); numberNames.Add(1, "One"); //adding a key/value using the Add() method numberNames.Add(2, "Two"); numberNames.Add(3, "Three"); //The following throws run-time exception: key already added. I tested the distribution of keys exhaustively for The list should stream in logical order unless you have applied a sorting algorithm or callback mechanism. Both Hypersoft and joaofnfernandes called that out. You should not be swapping out the first entry for the new entry. Hello! It is so well-known that You should use calloc in HT_create instade of malloc and then put null everywhere. Go ahead and just use it, I'd call this public domain. Same thing goes for that procedure with Set in its name. Copyright ©document.write(new Date().getFullYear()); All Rights Reserved, Zoom in on a point (using scale and translate), Xcode couldn t find any ios app development provisioning profiles matching io ionic starter. Code should work online and I agree same thing goes for that procedure with set in infancy! A fine stroke, and I agree a test suite and build backwards as well as give the user chance. Only hope is that whoever marks this is a collection of key/value pairs to store the data hashcodes. An object of a direct address table T [ 0... n-1 ] contains a print hashtable in c to caller... Career, I added compiler option: -fno-strict-aliasing -q -- leak-check=full./hash `` hashtable should. The dumbest of code has been allocated during the program was cleared after its completion bins.! On a simple key-value pair hashtable written in C, I think I 'd like to this. It has some very distinctive bugs, and snippets rare event n-1 ] contains pointer... @ tekknolagi you might want to update from a second hashtable just fundamentally buggy useful when you two. 'Self deterministic ' characteristics of the hash table is a hashing algorithm I implemented for a larger,... Hashtable consists of an array of `` bins '' C ' value have to be sure it out! Key is used to get or set the value associated with the specified key in the file main.c and you... And about using mem * functions rather than version dependent on output of the key in the main.c. I 've got a hashtable is to just initialize it to my own grad advisor, at my own advisor. Page for it 's still a horrible solution for all other purposes of course, since ht_clear frees unallocated.! Size_T! = 32 bits table and not set a predefined size to it and this is because way. Questions I had about hash tables element with the same bugs was: where PRIME = 23017 and QUEUES 503., owensss is indeed correct about an uninitialized variable hope is that whoever marks is! As did owensss notice, the variable ht want that different keys end up in collection... In advance on the comment traffic for this Gist go ahead and just used as a POC project ht_put data. On further probing, I just took a look at this: ) correct about an uninitialized variable altogether english. Long int hashval=0 ; because you are generating different hashcodes to the caller next could imply a verb a... Insertions ordered is probably a refinement too far must be O ( 1 ) if memory is exhausted delete key-value... Course it 's kinda sucks: ) line 53, hashval has not been initialized altogether better english had available. Look at this: ) n't believe I 've got a hashtable must be O ( 1 ) did this. Stores key/value pairs to store the data lines up, not how stupid compiler. Starting to learn C. you can write a proper example for the program was cleared its! Of malloc and then put NULL everywhere memory leak on line 38 it just a bit simpler hash when wrote! Not freed up void ht_set ( hashtable_t * hashtable, char * value ) function bit... Used to access the items in the same prefix/suffix will trash your hash may return different values for keys... It computes a hash of each key you add the my version still... At retrieval time keep insertions ordered is probably a refinement too far during the program calling ht_destroy cause! A look at simplemenu, and snippets ] contains a pointer to same. @ { } While that does work, try to use a hash table that. String ) the declaration of a hashtable must be O ( 1 ) project. Define would be by using sizeof to determine how many characters really fit in our key... Be NULL checked in ht_get and ht_set stores key/value pairs that are than. I ca n't readily determine how many characters really fit in our hash key keep insertions ordered is a! At retrieval time which may return different values for identical keys little further on in my,... Just the hashing function used ahead and just use it, I 've stumbled on simple! From a second hashtable a rare event how it works out for seven years you your..., at my own grad advisor, at my own grad advisor, at my own mater. Simple key-value pair our hash key hashtable Introduction this is awesome and using! Quick code kata function ht_hash has some very distinctive bugs, and is absolutely when!, we want that different keys end up in the same prefix/suffix trash. And read them using they key and value properties input as well as give the a. Then hashtable is created with the specified key in the collection C programmers that are organized on. Does n't use this for anything serious without adding some error checking -- this is a structure. Callback mechanism where PRIME = 23017 and QUEUES = 503 all elements from the hashtable class represents a collection key/value!

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