Iurii Tatishchev
b43f08aacc
Reuse code from the previous lab and write new code as described below: - search hash: Modify this function to return -1 if the target key is not found or the number of collisions for that key if found. `int search(Student &target, string key);` - remove hash: Create a new function to delete an item from the hash table. - insert manager: inserts user provided data into the hash table and rejects duplicates.
135 lines
4.1 KiB
C++
135 lines
4.1 KiB
C++
/*
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CIS 22C
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Hashing - Linear Probe: insert, search, and delete
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Written By: Iurii Tatishchev
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Reviewed & Modified by: Iurii Tatishchev
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*/
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#include <iostream>
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#include <sstream>
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#include "HashTable.h"
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using namespace std;
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void buildHash(HashTable &hash);
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void searchManager(const HashTable &hash);
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void deleteManager(HashTable &hash);
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void insertManager(HashTable &hash);
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int main() {
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HashTable hash;
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buildHash(hash);
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cout << "Load Factor: " << hash.getLoadFactor() << endl;
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searchManager(hash);
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deleteManager(hash);
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insertManager(hash);
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return 0;
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}
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/* **************************************************
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This function builds a hash table with data from an array
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It calls the insert() function that inserts the new data at the right location in the hash table.
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************************************************** */
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void buildHash(HashTable &hash) {
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Student list[] = {{"Tom", 2.5},
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{"Bob", 3.2},
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{"Boc", 3.2},
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{"Linda", 3.9},
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{"Tim", 4.0},
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{"Vic", 3.9},
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{"Ann", 3.5},
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{"Dylan", 3.1},
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{"obB", 2.2},
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{"oBb", 3.7},
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{"Bbo", 3.3},
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{"bBo", 3.9},
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{"boB", 2.3},
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{"", 0}};
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for (int i = 0; list[i].getName() != ""; i++) {
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hash.insert(list[i]);
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}
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}
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/* **************************************************
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This function searches a hash table with user provided data.
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It calls the hash search function in a loop.
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To stop searching enter "#"
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************************************************** */
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void searchManager(const HashTable &hash) {
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cout << endl << "~*~ Test Search ~*~" << endl;
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cout << "Enter name [# to stop searching]:" << endl;
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string name;
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getline(cin, name);
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while (name != "#") {
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Student item;
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int nc = hash.search(item, name);
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if (nc != -1) {
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cout << item.getName() << " " << item.getGpa() << " (" << nc << " collisions!)" << endl;
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} else {
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cout << name << " not found!" << endl;
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}
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getline(cin, name);
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}
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}
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/* **************************************************
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This function deletes user provided data data from a hash table
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It calls the hash delete function in a loop.
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To stop deleting enter "#"
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************************************************** */
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void deleteManager(HashTable &hash) {
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cout << endl << "~*~ Test Delete ~*~" << endl;
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cout << "Enter name [# to stop deleting]:" << endl;
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string name;
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getline(cin, name);
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while (name != "#") {
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Student itemOut;
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if (hash.remove(itemOut, name)) {
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cout << itemOut.getName() << " " << itemOut.getGpa() << " - deleted!" << endl;
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} else {
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cout << name << " not found!" << endl;
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}
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cout << "Load Factor: " << hash.getLoadFactor() << endl;
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getline(cin, name);
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}
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}
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/* **************************************************
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This function inserts user provided data into the hash table
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It rejects duplicates.
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It calls hash search and hash insert in a loop.
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To stop getting user input enter "#"
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************************************************** */
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void insertManager(HashTable &hash) {
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cout << endl << "~*~ Test Insert - reject duplicates ~*~" << endl;
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cout << "Enter name [# to stop reading]:" << endl;
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string name;
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getline(cin, name);
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while (name != "#") {
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Student found;
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if (hash.search(found, name) != -1) {
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cout << "Duplicate key: " << found.getName() << " - rejected!" << endl;
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} else {
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cout << "Enter gpa:" << endl;
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double gpa;
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cin >> gpa;
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cin.ignore();
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Student newStudent(name, gpa);
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hash.insert(newStudent);
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cout << name << " - inserted (" << hash.search(found, name) << " collisions)" << endl;
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}
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cout << "Load Factor: " << hash.getLoadFactor() << endl;
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cout << "Enter name [# to stop reading]:" << endl;
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getline(cin, name);
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}
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}
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