Solve collection tasks
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140
collections/Cargo.lock
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140
collections/Cargo.lock
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# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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version = 3
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"zerocopy-derive",
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7
collections/Cargo.toml
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7
collections/Cargo.toml
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[package]
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name = "collections"
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version = "0.1.0"
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edition = "2021"
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[dependencies]
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rand = "0.8.5"
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168
collections/src/main.rs
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168
collections/src/main.rs
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use std::{collections::HashMap, io::{self, Write}};
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use rand::Rng;
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fn main() {
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// Task 1: Statistics
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let median: f32;
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let mode;
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let mut rng = rand::thread_rng();
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let mut values = Vec::new();
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println!("values:");
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for _ in 1..=rng.gen_range(1..10) {
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let value = rng.gen_range(1..5);
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println!("{value}");
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values.push(value);
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}
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median = if values.len() == 1 {
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values[0] as f32
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} else {
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match values.len() % 2 {
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0 => ((values[values.len() / 2] + values[(values.len() / 2) - 1]) as f32) / 2.0,
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_ => values[values.len() / 2] as f32
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}
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};
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let mut occurrences = HashMap::new();
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for number in &values {
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*occurrences.entry(*number).or_insert(0) += 1;
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}
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mode = *occurrences.iter().max_by_key(|e| e.1).unwrap().0;
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println!("number of elements: {}", values.len());
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println!("median: {median}");
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println!("mode: {mode}");
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// Task 2:
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let words = ["first", "apple"];
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for word in words {
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let mut result;
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if ['a','e', 'i', 'o', 'u', 'ä', 'ö', 'ü'].contains(&word.to_lowercase().chars().next().unwrap()) {
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result = String::from(word);
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result.push_str("-h");
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} else {
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result = String::from(&word[1..]);
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result.push('-');
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result.push_str(&word[0..=0]);
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}
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result.push_str("ay");
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println!("input: {word}");
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println!("pig latin: {result}");
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}
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println!();
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// Task 3:
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let mut exit = false;
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let mut employees: HashMap<String, Vec<String>> = HashMap::new();
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println!("Welcome to the human resources management console!");
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println!("Please enter a command or 'help' for the help message.");
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while !exit {
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let mut input = String::new();
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print!("> ");
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io::stdout().flush().expect("An error occurred");
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io::stdin().read_line(&mut input).expect("An error occurred");
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match input.to_lowercase().trim() {
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"q" | "quit" => exit = true,
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"h" | "help" => {
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println!("This program allows you to manage employees and their corresponding department.");
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println!();
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println!("Following commands are available:");
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println!("p, print [department]: prints all employees or the employees of the specified department");
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println!();
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println!("a, add {{employee}} to {{department}}: adds the specified employee to the specified department");
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println!();
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println!("r, remove {{employee}} from {{department}}: adds the specified employee to the specified department");
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println!();
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println!("q, quit: closes the program");
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println!();
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println!("h, help: prints this help message");
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println!();
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}
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_ => {
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let arguments = input.split_whitespace();
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if arguments.clone().count() > 0 {
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let command = arguments.clone().next().expect("An error occurred");
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match command.to_lowercase().as_str() {
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"a" | "add" => {
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match input[command.len()..].split(" to ").collect::<Vec<&str>>().as_slice() {
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[employee, department] => {
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employees.entry(department.trim().to_string()).or_insert(Vec::new()).push(employee.trim().to_string());
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},
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_ => {
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println!("The syntax of the command \"{input}\" is incorrect!");
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println!("Please try again");
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}
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}
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}
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"r" | "remove" => {
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match input[command.len()..].split(" from ").collect::<Vec<&str>>().as_slice() {
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[employee, department] => {
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employees.entry(department.trim().to_string()).and_modify(|e| e.retain(|e| *e != employee.trim()));
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employees.retain(|_, e| !e.is_empty());
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},
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_ => {
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println!("The syntax of the command \"{input}\" is incorrect!");
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println!("Please try again");
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}
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}
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}
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"p" | "print" => {
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if input.trim().len() > command.len() {
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let department = input[command.len()..].trim();
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match employees.get(department) {
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Some(employees) => {
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println!("Employees in {department}:");
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let mut employees: Vec<_> = employees.iter().collect();
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employees.sort();
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for employee in employees {
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println!(" {employee}");
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}
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},
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None => println!("The department {department} does not exist!")
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}
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} else {
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if employees.len() > 0 {
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println!("All employees:");
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println!();
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let mut employees: Vec<_> = employees.iter().collect();
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employees.sort_by_key(|e| e.0);
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for entry in employees {
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let department = entry.0;
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let mut employees: Vec<_> = entry.1.iter().collect();
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employees.sort();
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println!(" {department}:");
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for employee in employees {
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println!(" {employee}");
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}
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}
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} else {
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println!("No employees or departments have been added so far.");
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}
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}
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}
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_ => {
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println!("The specified command \"{}\" is invalid!", input.trim());
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}
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}
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}
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}
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}
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}
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}
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