Arizona State University - CS 412Lab_hash_2nd_revised.cpp

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/* Hash Table: Create a hash table class/struct. Define an array that holds 27 elements. Define a function called Hash(int) - This function returns the modulo of that int by the size of the tabl... e (array). Define an add function that takes an integer. - This function takes the integer, determines the hash of that number by calling the above hash function, then adds it to the table using linear probing for collision resolution. Define a function that looks up a value, it takes an integer, return -1 if the value is not in the table. Create a main that allows the user to add and lookup items in the table. */ #include <iostream> #include <iomanip> using namespace std; const int SIZE = 27; // a good strong prime number const int EMPTY = -1; // -1 indicates that the cell is empty #define DISPLAY true // remove to disable debugging output struct hashrecord { int id; //to hold a unique id for each element int data; //the data for each element, I used a simple int }; class HashTable { private: hashrecord table[SIZE]; // where our data will be held public: HashTable(); int Hash(int data); bool Add(int data); bool Probe(int data); int Lookup(int data); void Print(); }; HashTable::HashTable() { #ifdef DISPLAY cout << "Building hash table.\n"; #endif for (int i = 0; i < SIZE; i++) // table[i] = EMPTY; { table[i].id = -1; //set all ids to -1 to show they're empty table[i].data = EMPTY; //set all data values to default } } //This function returns the modulo of that int by the size of the table (array). int HashTable::Hash(int data) { return data % SIZE; } /* add items in the table. - This function takes the integer, determines the hash of that number by calling the above hash function, then adds it to the table using linear probing for collision resolution. */ bool HashTable::Add(int data) [Show More]

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