finish vectors

friends/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "vectors"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

friends/src/main.rs

@@ -0,0 +1,88 @@
+use std::io;
+
+fn main() {
+    let mut friends: Vec<String> = Vec::new();
+
+    friends = init_list();
+    println!("you're friends with {:?}", friends);
+    println!("1. update\n2. quit");
+
+    let mut choice = String::new();
+
+    io::stdin()
+        .read_line(&mut choice)
+        .expect("failed to read line!");
+
+    let choice: u32 = match choice.trim().parse() {
+        Ok(num) => num,
+        Err(_) => {
+            todo!();
+        }
+    };
+
+    if choice == 1 {
+        update_list(&mut friends);
+        println!("updated friends list {:?}", friends);
+    } else {
+        return;
+    }
+}
+
+fn update_list(friends: &mut Vec<String>) {
+    println!("\t...your friends as of now are: {:?}", friends);
+    println!("...which one would you like to update?");
+
+    let mut index = String::new();
+
+    io::stdin()
+        .read_line(&mut index)
+        .expect("failed to read line!");
+
+    let index: usize = match index.trim().parse() {
+        Ok(num) => num,
+        Err(_) => {
+            todo!();
+        }
+    };
+
+    println!("...and you would like to replace them with: ");
+    let mut to_update_with = String::new();
+
+    io::stdin()
+        .read_line(&mut to_update_with)
+        .expect("failed to read line!");
+
+    friends[index - 1] = to_update_with;
+}
+
+fn init_list() -> Vec<String> {
+    println!("how many friends do you have?");
+
+    let mut friend_count = String::new();
+
+    io::stdin()
+        .read_line(&mut friend_count)
+        .expect("failed to read line!");
+
+    let friend_count: u32 = match friend_count.trim().parse() {
+        Ok(num) => num,
+        Err(_) => {
+            todo!();
+        }
+    };
+
+    let mut names = Vec::new();
+
+    for i in 0..friend_count {
+        println!("\tenter name of friend {}", i + 1);
+
+        let mut name = String::new();
+        io::stdin()
+            .read_line(&mut name)
+            .expect("failed to read line!");
+
+        names.push(name);
+    }
+
+    names
+}

picasso/src/main.rs

@@ -56,6 +56,7 @@ fn main() {
 
     print_result(&result);
 }
+
 fn compare(r1: &Rectangle, r2: &Rectangle, r3: &Rectangle) -> [bool; 6] {
     let mut result: [bool; 6] = [false; 6];
 

slot-machine/src/main.rs

@@ -13,6 +13,9 @@ fn main() {
     print_rules();
     let tries = manage_balance(load_money());
 
+    if tries == 0 {
+        return;
+    } else {
         let mut total_payout: u32 = 0;
 
         for _ in 0..tries {
@@ -43,6 +46,7 @@ fn main() {
         }
         println!("\nyou walk away with ${total_payout}");
     }
+}
 
 fn spin() -> SpinResult {
     let random: u32 = rng().random_range(0..5);

variables/src/main.rs

@@ -35,22 +35,20 @@ fn main() {
     );
 
     println!("\ncaroline replaced kyle");
+
     employees[3] = "caroline";
 
     println!("employees are: {:?}", employees);
 
     employee_of_the_month = (months[1], employees[1], ratings[2]);
-
     let (x, y, z) = employee_of_the_month;
     println!("\nin {x}, {y} was the employee of the month with a rating of {z}");
 
     employee_of_the_month = (months[2], employees[2], ratings[1]);
-
     let (x, y, z) = employee_of_the_month;
     println!("\nin {x}, {y} was the employee of the month with a rating of {z}");
 
     employee_of_the_month = (months[3], employees[3], ratings[0]);
-
     let (x, y, z) = employee_of_the_month;
     println!("\nin {x}, {y} was the employee of the month with a rating of {z}");
 }

vectors/src/main.rs

@@ -1,88 +1,59 @@
-use std::io;
-
 fn main() {
-    let mut friends: Vec<String> = Vec::new();
+    //empty vector must have a type
+    let mut v: Vec<i32> = Vec::new();
 
-    friends = init_list();
+    //otherwise vectors infer types at the time of assignment
-    println!("you're friends with {:?}", friends);
+    let mut v1 = vec!["john", "jack", "jacob"];
-    println!("1. update\n2. quit");
 
-    let mut choice = String::new();
+    v1.push("jill");
+    v.push(2);
 
-    io::stdin()
+    println!("{:?}, {:?}", v, v1);
-        .read_line(&mut choice)
-        .expect("failed to read line!");
 
-    let choice: u32 = match choice.trim().parse() {
+    //reading from a vector
-        Ok(num) => num,
+    //using get and a simple reference
-        Err(_) => {
+    let fetch = &v[0];
-            todo!();
+    let fetch1 = v1.get(2);
-        }
-    };
 
-    if choice == 1 {
+    println!("{:?}, {:?}", fetch, fetch1);
-        update_list(&mut friends);
+
-        println!("updated friends list {:?}", friends);
+    //interating over vector values
-    } else {
+    for i in &v1 {
-        return;
+        println!("\t{i}");
-    }
     }
 
-fn update_list(friends: &mut Vec<String>) {
+    let mut v2 = vec![10, 20, 30];
-    println!("\t...your friends as of now are: {:?}", friends);
+    let v2 = add_ten(&mut v2).clone();
-    println!("...which one would you like to update?");
+    println!("{:?}", v2);
 
-    let mut index = String::new();
+    using_enums();
-
-    io::stdin()
-        .read_line(&mut index)
-        .expect("failed to read line!");
-
-    let index: usize = match index.trim().parse() {
-        Ok(num) => num,
-        Err(_) => {
-            todo!();
-        }
-    };
-
-    println!("...and you would like to replace them with: ");
-    let mut to_update_with = String::new();
-
-    io::stdin()
-        .read_line(&mut to_update_with)
-        .expect("failed to read line!");
-
-    friends[index - 1] = to_update_with;
 }
 
-fn init_list() -> Vec<String> {
+fn add_ten(vec: &mut Vec<i32>) -> &Vec<i32> {
-    println!("how many friends do you have?");
+    for i in &mut *vec {
-
+        *i += 10;
-    let mut friend_count = String::new();
-
-    io::stdin()
-        .read_line(&mut friend_count)
-        .expect("failed to read line!");
-
-    let friend_count: u32 = match friend_count.trim().parse() {
-        Ok(num) => num,
-        Err(_) => {
-            todo!();
     }
-    };
+    vec
-
-    let mut names = Vec::new();
-
-    for i in 0..friend_count {
-        println!("\tenter name of friend {}", i + 1);
-
-        let mut name = String::new();
-        io::stdin()
-            .read_line(&mut name)
-            .expect("failed to read line!");
-
-        names.push(name);
 }
 
-    names
+#[derive(Debug)]
+enum Groups {
+    Cities(String),
+    NumericCodes(i32),
+}
+
+fn using_enums() {
+    let japan = vec![
+        Groups::Cities(String::from("Tokyo")),
+        Groups::NumericCodes(1),
+    ];
+
+    let china = vec![
+        Groups::Cities(String::from("Beijing")),
+        Groups::NumericCodes(2),
+    ];
+
+    let places = vec![japan, china];
+
+    println!("{:?}", places);
 }