Hash Table Example
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/*this program will simulate the spreading of a disease through agrid of people, starting from a user-defined person. It will countthe number of turns taken before everyone on the grid is immunizedto the disease after having caught it once.This program will user the SIR model (Susceptible, Infectious, Recovered)and cellular automata to simulate the people in the grid.*/#include <iostream>using namespace std;/* Any and all global variables */const int SIZE = 8; //Size of the square person array/* Any and all functions */void gridDefaultify(char[][SIZE], int);//Purpose: Sets each item in the person array to 's'//Parameters: A square, two-dimensional array// The size of that array's boundsvoid gridDisplay(char[][SIZE], int);//Purpose: Formats and prints the information in the person grid//Parameters: A square, two-dimensional array// The value of the current dayvoid nextTurn(char[][SIZE], char[][SIZE], int&);//Purpose: Updates the grid of people, and the current day//Parameters: Two square, two-dimensional arrays// A reference to the current day (so that it can be updated)int countInfected(char[][SIZE], int);//Purpose: Counts the number of infectious people on the grid//Parameters: A square, two-dimensional array// The size of that array's boundsint main(){int currentDay = 0; //Infection begins on day 0, and ends one day after the last person is Recoveredchar gridCurrent[SIZE][SIZE]; //Grid of all peoplechar gridUpdate[SIZE][SIZE]; //Where the user chooses to start the infectionint xToInfect;int yToInfect; //Set of coordinates for the initial infection position, given by user//Initializes the grids to all 's'gridDefaultify(gridCurrent, SIZE);gridDefaultify(gridUpdate, SIZE);//The below block gets the initial infection coordinates from the usercout << "Please enter a location to infect: ";while(true){cin >> xToInfect >> yToInfect;xToInfect--;yToInfect--;if(xToInfect < 0 || yToInfect < 0 || xToInfect >= SIZE || yToInfect >= SIZE){cout << "Those coordinates are outside the bounds of this region." << endl;cout << "Please enter another location to infect: ";continue;} else {gridCurrent[xToInfect][yToInfect] = 'i';break;}}//Displays the initial state of the gridgridDisplay(gridCurrent, currentDay);//The below block will display and update the grid until the infection is done.while(true){nextTurn(gridCurrent, gridUpdate, currentDay);gridDisplay(gridCurrent, currentDay);if(countInfected(gridCurrent, SIZE) == 0) break; //Once there are no more infected, the game is done}//Displays the number of days taken for the infection to endcout << "It took " << currentDay + 1 << " days for the outbreak to end";cout << endl;return 0;}void gridDefaultify(char arr[][SIZE], int arrSize){for(int x = 0; x < arrSize; x++){for(int y = 0; y < arrSize; y++){arr[x][y] = 's'; //Sets all items in the passed-in array to 's'}}return;}void gridDisplay(char arr[][SIZE], int day){cout << "Day " << day << endl; //Prints the current dayfor(int x = 0; x < SIZE; x++){for(int y = 0; y < SIZE; y++){cout << arr[x][y] <<" "; //Prints the array's contents}cout << endl; //Formats with newlines}cout << endl; //Some spacingreturn;}void nextTurn(char today[][SIZE], char update[][SIZE], int& day){day++; //Updates the dayint xCheck; //X coordinate to be checkedint yCheck; //Y coordinate to be checkedfor(int x = 0; x < SIZE; x++){for(int y = 0; y < SIZE; y++){//Sets all 'i' to 'r' in the new gridif(today[x][y] == 'i' || today[x][y] == 'r'){update[x][y] = 'r'; //Updates all infectious to recovered, and keeps current recovered}if(today[x][y] == 's'){ // If the person is susceptible...for(int xCheck = x-1; xCheck <= x+1; xCheck++){ // Check all x coordinates around the personfor(int yCheck = y-1; yCheck <= y+1; yCheck++){ // Check all y coordinates around the personif(xCheck == x && yCheck == y){// Don't check at the person because there is no need to check there} else {if(xCheck >= 0 && yCheck >= 0 && xCheck < SIZE && yCheck < SIZE){ // Make sure the checked coordinates are in boundsif(today[xCheck][yCheck] == 'i'){ //Is the person at the checked coordinates infected?update[x][y] = 'i'; //If so, update the 's' to 'i' in the new grid}}}}}}}}for(int x = 0; x < SIZE; x++){for(int y = 0; y < SIZE; y++){today[x][y] = update[x][y]; //Updates today's grid with the new values}}}int countInfected(char arr[][SIZE], int arrSize){int count = 0;for(int x = 0; x < arrSize; x++){for(int y = 0; y < arrSize; y++){if(arr[x][y] == 'i') count++; //Increments count for each infected person in the grid}}return count;}
// Iterative C++ program to// implement Stein's Algorithm//#include <bits/stdc++.h>#include <bitset>using namespace std;// Function to implement// Stein's Algorithmint gcd(int a, int b){/* GCD(0, b) == b; GCD(a, 0) == a,GCD(0, 0) == 0 */if (a == 0)return b;if (b == 0)return a;/*Finding K, where K is thegreatest power of 2that divides both a and b. */int k;for (k = 0; ((a | b) & 1) == 0; ++k){a >>= 1;b >>= 1;}/* Dividing a by 2 until a becomes odd */while ((a & 1) == 0)a >>= 1;/* From here on, 'a' is always odd. */do{/* If b is even, remove all factor of 2 in b */while ((b & 1) == 0)b >>= 1;/* Now a and b are both odd.Swap if necessary so a <= b,then set b = b - a (which is even).*/if (a > b)swap(a, b); // Swap u and v.b = (b - a);} while (b != 0);/* restore common factors of 2 */return a << k;}// Driver codeint main(){int a = 12, b = 780;printf("Gcd of given numbers is %d\n", gcd(a, b));return 0;}
#include <iostream>using namespace std;int main() {const int ROW_SIZE = 2;const int COLUMN_SIZE = 5; //establish all variablesint matrix[ROW_SIZE][COLUMN_SIZE];int minVal;for (int i = 0; i < ROW_SIZE; ++i) // for loop to ask user to enter data.{for (int h = 0; h < COLUMN_SIZE; ++h) {cout << "Enter data for row #" << i + 1 << " and column #" << h + 1 << ": ";cin >> matrix[i][h];}}cout << "You entered: " << endl;for (int i = 0; i < ROW_SIZE; ++i) //for statements to output the array neatly{for (int h = 0; h < COLUMN_SIZE; ++h) {cout << matrix[i][h] << "\t";}cout << endl;}cout << "Minimum for each row is: {";for (int i = 0; i < ROW_SIZE; i++) //for statements to find the minimum in each row{minVal = matrix[i][0];for (int h = 0; h < COLUMN_SIZE; h++) {if (matrix[i][h] < minVal) // if matrix[i][h] < minVal -> minVal = matrix[i][h];{minVal = matrix[i][h];}}cout << minVal << ", ";}cout << "}" << endl;cout << "Minimum for each column is: {";for (int i = 0; i < COLUMN_SIZE; i++) //for statements to find the minimum in each column{minVal = matrix[0][i];for (int h = 0; h < ROW_SIZE; h++) {if (matrix[h][i] < minVal) //replaces minVal with array index for that column that is lowest{minVal = matrix[h][i];}}cout << minVal << ", ";}cout << "}" << endl;return 0;}
#include <iostream>#include <cstring>#include <unistd.h>#include <sys/utsname.h>int main() {char newHostname[] = "newhostname"; // Replace with the desired hostnameif (sethostname(newHostname, strlen(newHostname)) == 0) {std::cout << "Hostname set to: " << newHostname << std::endl;// Optionally, update the /etc/hostname file to make the change permanentFILE *hostnameFile = fopen("/etc/hostname", "w");if (hostnameFile != NULL) {fprintf(hostnameFile, "%s\n", newHostname);fclose(hostnameFile);} else {perror("Failed to update /etc/hostname");}} else {perror("Failed to set hostname");}return 0;}
#include <iostream>int main(){const char* const hello = "Hello, world!";const char* bruh = hello;char* const yeet = hello;std::cout << bruh << std::endl;std::cout << yeet << std::endl;return 0;}/*Place your bets!Will the program:a.) Print "Hello, world!" twice?b.) Compile error on line 5 (bruh initialize line) because the pointer gets implicit cast to non-const?c.) Compile error on line 7 (yeet initialize line) because the char gets implicit cast to non-const?d.) Both b and c?e.) Compile error line 11 (print yeet) because the pointer is constant and can't be incrementedf.) Print "Hello, world!" then print the pointer address in hexadecimalg.) Both b and e?h.) Both c and e?i.) B, c, and e?*/// The answer is in this base 64 string:// 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
#include <iostream>#include <fstream>#include <string>#include <cstring>using namespace std;//This program makes a new text file that contains all combinations of two letters.// aa, ab, ..., zy, zzint main(){string filename = "two_letters.txt";ofstream outFile;outFile.open(filename.c_str());if(!outFile.is_open()){cout << "Something's wrong. Closing..." << endl;return 0;}for(char first = 'a'; first <= 'z'; first++){for(char second = 'a'; second <= 'z'; second++){outFile << first << second << " ";}outFile << endl;}return 0;}