From 04c6e7e66a739eef944d83e1c6513a8dc751073f Mon Sep 17 00:00:00 2001
From: Reality Enjoyer <git@88842069.com>
Date: Sat, 20 Dec 2025 18:13:04 +0000
Subject: [PATCH] functions, loops and control flow

---
 functions/Cargo.toml         |  6 +++
 functions/src/main.rs        | 71 ++++++++++++++++++++++++++++++++++++
 loops/Cargo.toml             |  6 +++
 loops/christmas/Cargo.toml   |  6 +++
 loops/christmas/src/main.rs  | 42 +++++++++++++++++++++
 loops/fibonacci/Cargo.toml   |  6 +++
 loops/fibonacci/src/main.rs  | 29 +++++++++++++++
 loops/src/main.rs            | 17 +++++++++
 loops/tempverter/Cargo.toml  |  6 +++
 loops/tempverter/src/main.rs | 49 +++++++++++++++++++++++++
 variables/Cargo.toml         |  6 +++
 variables/src/main.rs        | 56 ++++++++++++++++++++++++++++
 12 files changed, 300 insertions(+)
 create mode 100644 functions/Cargo.toml
 create mode 100644 functions/src/main.rs
 create mode 100644 loops/Cargo.toml
 create mode 100644 loops/christmas/Cargo.toml
 create mode 100644 loops/christmas/src/main.rs
 create mode 100644 loops/fibonacci/Cargo.toml
 create mode 100644 loops/fibonacci/src/main.rs
 create mode 100644 loops/src/main.rs
 create mode 100644 loops/tempverter/Cargo.toml
 create mode 100644 loops/tempverter/src/main.rs
 create mode 100644 variables/Cargo.toml
 create mode 100644 variables/src/main.rs

diff --git a/functions/Cargo.toml b/functions/Cargo.toml
new file mode 100644
index 0000000..9c392ab
--- /dev/null
+++ b/functions/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "functions"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/functions/src/main.rs b/functions/src/main.rs
new file mode 100644
index 0000000..f5fb34d
--- /dev/null
+++ b/functions/src/main.rs
@@ -0,0 +1,71 @@
+// fn main() {
+//     print_labelled_measurements(5, 'h');
+// }
+//
+// fn print_labelled_measurements(value: i32, unit_label: char) {
+//     println!("The measurement is: {value}{unit_label}");
+// }
+//
+// // a variable
+//
+use std::io::{self};
+
+fn main() {
+    println!(
+        "welcome to our rudimentary calculator!\nwe can do two things:\n1.factorial.2.square\nwhich one do you want?\n\t"
+    );
+    loop {
+        let mut input = String::new();
+
+        io::stdin()
+            .read_line(&mut input)
+            .expect("couldn't read line!");
+
+        let input: i32 = input.trim().parse().expect("numbers only");
+
+        if input > 2 || input < 0 {
+            println!("aye choose from the options foo");
+            break;
+        }
+
+        println!("\nalright and what number to operate on?\n\t");
+
+        let mut number = String::new();
+
+        io::stdin()
+            .read_line(&mut number)
+            .expect("couldn't read line!");
+
+        let number: i32 = number
+            .trim()
+            .parse()
+            .expect("aye foo enter a numberrr quit playin");
+
+        if input == 1 {
+            println!("\nthe factorial of {number} is {}", factorial(number));
+            break;
+        } else {
+            println!("\nthe square of {number} is {}", square(number));
+            break;
+        }
+    }
+
+    fn square(x: i32) -> i32 {
+        return x * x;
+    }
+
+    //TODO: fix factorial function after you figure out loops
+    //NOTE: we have implemented factorial in the the loops sub-directory
+    fn factorial(x: i32) -> i32 {
+        let mut rev = x - 1;
+        let mut result = x;
+        loop {
+            result *= rev;
+            rev -= 1;
+
+            if rev < 3 {
+                break result * 2;
+            }
+        }
+    }
+}
diff --git a/loops/Cargo.toml b/loops/Cargo.toml
new file mode 100644
index 0000000..a046a76
--- /dev/null
+++ b/loops/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "loops"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/loops/christmas/Cargo.toml b/loops/christmas/Cargo.toml
new file mode 100644
index 0000000..cb4498b
--- /dev/null
+++ b/loops/christmas/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "christmas"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/loops/christmas/src/main.rs b/loops/christmas/src/main.rs
new file mode 100644
index 0000000..9fce1ea
--- /dev/null
+++ b/loops/christmas/src/main.rs
@@ -0,0 +1,42 @@
+//this probably can be made better
+fn main() {
+    let cardinals: [&str; 12] = [
+        "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", "ninth",
+        "tenth", "eleventh", "twelfth",
+    ];
+
+    let lines: [&str; 12] = [
+        "A partridge in a pear tree",
+        "Two turtle doves",
+        "Three French hens",
+        "Four colly birds",
+        "Five gold rings",
+        "Six geese a-laying",
+        "Seven swans a-swimming",
+        "Eight maids a-milking",
+        "Nine drummers drumming",
+        "Ten pipers piping",
+        "Eleven ladies dancing",
+        "Twelve fiddlers fiddling",
+    ];
+
+    for mut i in 1..13 {
+        println!("The {} day of Christmas,", cardinals[i - 1]);
+        println!("My true love sent to me");
+
+        while i != 0 {
+            while i != 0 {
+                if i == 1 {
+                    println!("{}.\n", lines[i - 1]);
+                } else {
+                    if i == 2 {
+                        println!("{}, and", lines[i - 1]);
+                    } else {
+                        println!("{},", lines[i - 1]);
+                    }
+                }
+                i -= 1;
+            }
+        }
+    }
+}
diff --git a/loops/fibonacci/Cargo.toml b/loops/fibonacci/Cargo.toml
new file mode 100644
index 0000000..15ac334
--- /dev/null
+++ b/loops/fibonacci/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "fibonacci"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/loops/fibonacci/src/main.rs b/loops/fibonacci/src/main.rs
new file mode 100644
index 0000000..291dee2
--- /dev/null
+++ b/loops/fibonacci/src/main.rs
@@ -0,0 +1,29 @@
+use std::io;
+
+fn fib(x: i32) -> i32 {
+    if x == 1 {
+        return 0;
+    } else if x == 2 {
+        return 1;
+    } else {
+        return fib(x - 1) + fib(x - 2);
+    }
+}
+
+fn main() {
+    println!("welcome to the fibo party!");
+    println!("which fibonacci number would you like to see?");
+
+    let mut input = String::new();
+
+    io::stdin()
+        .read_line(&mut input)
+        .expect("error storing user input");
+
+    let input: i32 = input
+        .trim()
+        .parse()
+        .expect("error converting to number: did you enter a non-number?");
+
+    println!("fibonacci number {input} is {}", fib(input));
+}
diff --git a/loops/src/main.rs b/loops/src/main.rs
new file mode 100644
index 0000000..e054780
--- /dev/null
+++ b/loops/src/main.rs
@@ -0,0 +1,17 @@
+fn main() {
+    let fac: i32 = factorial(5);
+    println!("{fac}");
+}
+
+fn factorial(x: i32) -> i32 {
+    let mut rev = x - 1;
+    let mut result = x;
+    loop {
+        result *= rev;
+        rev -= 1;
+
+        if rev == 1 {
+            return result;
+        }
+    }
+}
diff --git a/loops/tempverter/Cargo.toml b/loops/tempverter/Cargo.toml
new file mode 100644
index 0000000..2162631
--- /dev/null
+++ b/loops/tempverter/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "tempverter"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/loops/tempverter/src/main.rs b/loops/tempverter/src/main.rs
new file mode 100644
index 0000000..4a6c732
--- /dev/null
+++ b/loops/tempverter/src/main.rs
@@ -0,0 +1,49 @@
+use std::io;
+
+fn main() {
+    println!("welcome to tempverter!");
+    println!("please enter your temp:");
+
+    let mut input = String::new();
+
+    io::stdin()
+        .read_line(&mut input)
+        .expect("error storing user input");
+
+    let input: i32 = input
+        .trim()
+        .parse()
+        .expect("error storing temperature - did you enter a number?");
+
+    println!("DEBUG: you entered {input}");
+
+    println!("is this in C or F?");
+
+    let mut input_unit = String::new();
+
+    io::stdin()
+        .read_line(&mut input_unit)
+        .expect("error storing user input");
+
+    let input_unit: char = input_unit
+        .trim()
+        .parse()
+        //NOTE: it won't panic when you enter a number
+        //because char is an unsigned 32-bit integer
+        //so it will akshually panic when you enter a negative number
+        .expect("error storing temperature unit - did you enter a char?");
+
+    if input_unit == 'c' || input_unit == 'C' {
+        println!("{input}C is {}F", converter(input, 1));
+    } else if input_unit == 'f' || input_unit == 'F' {
+        println!("{input}F is {}C", converter(input, 2));
+    }
+}
+
+fn converter(input: i32, choice: i32) -> i32 {
+    if choice == 1 {
+        return 32 + ((9 * input) / 5);
+    } else {
+        return ((input - 32) / 9) * 5;
+    }
+}
diff --git a/variables/Cargo.toml b/variables/Cargo.toml
new file mode 100644
index 0000000..c093eb6
--- /dev/null
+++ b/variables/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "variables"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/variables/src/main.rs b/variables/src/main.rs
new file mode 100644
index 0000000..266d59b
--- /dev/null
+++ b/variables/src/main.rs
@@ -0,0 +1,56 @@
+// fn main() {
+//     let mut x = 5;
+//     println!("The value of x is: {x}");
+//     x = 6;
+//     println!("The value of x is: {x}");
+// }
+
+// fn main() {
+//     // let tup: (i32, f64) = (500, 2.91);
+//     let tup = (500, 2.91);
+//     let t: bool = true;
+//     let c: char = '✅';
+//
+//     println!("t is {t}\nc is {c}\nand tup is {:?}\n\n\n", tup);
+//
+//     // let (x: i32, y: f64, z) = tup;
+//     let (x, y) = tup;
+//     println!("the second value is: {}", y);
+//     println!("the second value is: {}", tup.1);
+// }
+
+fn main() {
+    let months = ["jan", "feb", "mar", "apr", "may", "jun"];
+    let ratings: [i32; 3] = [1, 2, 3];
+    let mut employees = ["do kwon", "sbf", "tabasco", "kyle"];
+
+    println!("employees are: {:?}", employees);
+
+    let mut employee_of_the_month: (&str, &str, i32) = ("jan", "do kwon", 2);
+
+    let (x, y, z) = employee_of_the_month;
+    println!(
+        "\nin {x}, {y} was the employee of the month with a rating of {}",
+        employee_of_the_month.2
+    );
+
+    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}");
+}