diff --git a/src/CustomTypes/Enums.rs b/src/CustomTypes/Enums.rs
index 4effcb8..3cd36f3 100644
--- a/src/CustomTypes/Enums.rs
+++ b/src/CustomTypes/Enums.rs
@@ -48,7 +48,7 @@ impl VeryVerboseEnumOfThingsToDoWithNumbers{
 	}
 }
 
-fn main(){
+pub fn main(){
 	let pressed = WebEvent::KeyPress('x');
 	//`to_owned()` creates an owned `String` from a string slice.
 	let pasted = WebEvent::Paste("my text".to_owned());
diff --git a/src/CustomTypes/Enums/CLike.rs b/src/CustomTypes/Enums/CLike.rs
index a0e4977..3617598 100644
--- a/src/CustomTypes/Enums/CLike.rs
+++ b/src/CustomTypes/Enums/CLike.rs
@@ -15,7 +15,7 @@ enum Color{
 	Blue = 0x0000ff,
 }
 
-fn main(){
+pub fn main(){
 	//`enums` can be cast as integers.
 	println!("zero is {}", Number::Zero as i32);
 	println!("one is {}", Number::One as i32);
diff --git a/src/CustomTypes/Enums/TestCaseLinkedList.rs b/src/CustomTypes/Enums/TestCaseLinkedList.rs
index c1b3f09..cc4b42b 100644
--- a/src/CustomTypes/Enums/TestCaseLinkedList.rs
+++ b/src/CustomTypes/Enums/TestCaseLinkedList.rs
@@ -47,7 +47,7 @@ impl List{
 	}
 }
 
-fn main(){
+pub fn main(){
 	//Create an empty linked list
 	let mut list = List::new();
 
diff --git a/src/CustomTypes/Enums/Use.rs b/src/CustomTypes/Enums/Use.rs
index 9706439..aed5195 100644
--- a/src/CustomTypes/Enums/Use.rs
+++ b/src/CustomTypes/Enums/Use.rs
@@ -11,7 +11,7 @@ enum Work{
 	Soldier,
 }
 
-fn main(){
+pub fn main(){
 	// Explicitly `use` each name so they are available without manual scoping.
 	//use crate::Status::{Poor, Rich};
 	use Status::{Poor, Rich};
diff --git a/src/CustomTypes/Structures.rs b/src/CustomTypes/Structures.rs
index 866241d..318622e 100644
--- a/src/CustomTypes/Structures.rs
+++ b/src/CustomTypes/Structures.rs
@@ -41,7 +41,7 @@ fn square(pnt: Point, side: f32) -> Rectangle{
 	return rect;
 }
 
-fn main(){
+pub fn main(){
 	//Create struct with field init shorthand
 	let name = "Peter";
 	let age = 27;
diff --git a/src/HelloWorld/Comments.rs b/src/HelloWorld/Comments.rs
index ef9e04a..bea7e94 100644
--- a/src/HelloWorld/Comments.rs
+++ b/src/HelloWorld/Comments.rs
@@ -5,7 +5,7 @@
 //This is a hello world program for rust
 
 
-fn main(){
+pub fn main(){
 	//Basic printing
 	println!("Hello World");
 	let x = 5;
diff --git a/src/HelloWorld/FormattedPrint.rs b/src/HelloWorld/FormattedPrint.rs
index ce9a213..cdd9f8f 100644
--- a/src/HelloWorld/FormattedPrint.rs
+++ b/src/HelloWorld/FormattedPrint.rs
@@ -11,7 +11,7 @@ pub mod TestcaseList;
 pub mod Formatting;
 
 
-fn main(){
+pub fn main(){
 	// In general, the `{}` will be automatically replaced with any
 	// arguments. These will be stringified.
 	println!("{} days", 31);
diff --git a/src/HelloWorld/FormattedPrint/Debugging.rs b/src/HelloWorld/FormattedPrint/Debugging.rs
index 59a2c67..7963029 100644
--- a/src/HelloWorld/FormattedPrint/Debugging.rs
+++ b/src/HelloWorld/FormattedPrint/Debugging.rs
@@ -14,7 +14,7 @@ struct Person<'a>{
 	age: u8
 }
 
-fn main(){
+pub fn main(){
 	//Printing with `{:?}` is similar to with `{}`.
 	println!("{:?} months in a year.", 12);
 	println!("{1:?} {0:?} is the {actor:?} name.",
diff --git a/src/HelloWorld/FormattedPrint/Display.rs b/src/HelloWorld/FormattedPrint/Display.rs
index 69b7fc0..3c3ae01 100644
--- a/src/HelloWorld/FormattedPrint/Display.rs
+++ b/src/HelloWorld/FormattedPrint/Display.rs
@@ -39,7 +39,7 @@ impl fmt::Display for Complex{
 	}
 }
 
-fn main(){
+pub fn main(){
 	let minmax = MinMax(0, 14);
 
 	println!("Compare structures:");
diff --git a/src/HelloWorld/FormattedPrint/Formatting.rs b/src/HelloWorld/FormattedPrint/Formatting.rs
index df9f676..6e4ede3 100644
--- a/src/HelloWorld/FormattedPrint/Formatting.rs
+++ b/src/HelloWorld/FormattedPrint/Formatting.rs
@@ -31,7 +31,7 @@ impl Display for Color{
 	}
 }
 
-fn main(){
+pub fn main(){
 	for city in[
 		City{ name: "Dublin", lat: 53.347778, lon: -6.259722 },
 		City{ name: "Oslo", lat: 59.95, lon: 10.75 },
diff --git a/src/HelloWorld/FormattedPrint/TestcaseList.rs b/src/HelloWorld/FormattedPrint/TestcaseList.rs
index e128799..7a302d3 100644
--- a/src/HelloWorld/FormattedPrint/TestcaseList.rs
+++ b/src/HelloWorld/FormattedPrint/TestcaseList.rs
@@ -27,7 +27,7 @@ impl fmt::Display for List{
 	}
 }
 
-fn main(){
+pub fn main(){
 	let v = List(vec![1, 2, 3]);
 	println!("{}", v);
 }
diff --git a/src/Primitives/ArraysAndSlices.rs b/src/Primitives/ArraysAndSlices.rs
index a329e2a..6c685d3 100644
--- a/src/Primitives/ArraysAndSlices.rs
+++ b/src/Primitives/ArraysAndSlices.rs
@@ -6,7 +6,7 @@ fn analyze_slice(slice: &[i32]){
 	println!("the slice has {} elements", slice.len());
 }
 
-fn main(){
+pub fn main(){
 	//Fixed-size array (type signature is superfluous)
 	let xs: [i32; 5] = [1, 2, 3, 4, 5];
 
diff --git a/src/Primitives/LiteralsAndOperators.rs b/src/Primitives/LiteralsAndOperators.rs
index e4905ab..54d07b6 100644
--- a/src/Primitives/LiteralsAndOperators.rs
+++ b/src/Primitives/LiteralsAndOperators.rs
@@ -3,7 +3,7 @@ Integers 1, floats 1.2, characters 'a', strings "abc", booleans true and the uni
 Integers can, alternatively, be expressed using hexadecimal, octal or binary notation using these prefixes respectively: 0x, 0o or 0b.
 */
 
-fn main(){
+pub fn main(){
 	//Integer addition
 	println!("1 + 2 = {}", 1u32 + 2);
 
diff --git a/src/Primitives/Tuples.rs b/src/Primitives/Tuples.rs
index 11bfa2b..63fa767 100644
--- a/src/Primitives/Tuples.rs
+++ b/src/Primitives/Tuples.rs
@@ -23,7 +23,7 @@ fn transpose(matrix: Matrix) -> Matrix{
 	return newMatrix;
 }
 
-fn main(){
+pub fn main(){
 	//A tuple with a bunch of different types
 	let long_tuple = (1u8, 2u16, 3u32, 4u64,
 					  -1i8, -2i16, -3i32, -4i64,
diff --git a/src/main.rs b/src/main.rs
index 12396b4..c4ade36 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,5 +7,39 @@ mod CustomTypes;
 
 
 fn main(){
-	println!("Hello World");
+	//1 Hello World
+	//1.1 Comments
+	//HelloWorld::Comments::main();
+	//1.2 Formatted print
+	//HelloWorld::FormattedPrint::main();
+	//1.2.1
+	//HelloWorld::FormattedPrint::Debugging::main();
+	//1.2.2
+	//HelloWorld::FormattedPrint::Display::main();
+	//1.2.2.1
+	//HelloWorld::FormattedPrint::TestcaseList::main();
+	//1.2.3
+	//HelloWorld::FormattedPrint::Formatting::main();
+
+	//2 Primitives
+	//2.1 LiteralsAndOperators
+	//Primitives::LiteralsAndOperators::main();
+	//2.2 Tuples
+	//Primitives::Tuples::main();
+	//2.3 ArraysAndSlices
+	//Primitives::ArraysAndSlices::main();
+
+	//3 Custom Types
+	//3.1 Structures
+	//CustomTypes::Structures::main();
+	//3.2 Enums
+	//CustomTypes::Enums::main();
+	//3.2.1 Use
+	//CustomTypes::Enums::Use::main();
+	//3.2.2 C-Like
+	//CustomTypes::Enums::CLike::main();
+	//3.2.3 Testcase - Linked-list
+	//CustomTypes::Enums::TestCaseLinkedList::main();
+	//3.3 Constants
+	//CustomTypes::Constants::main();
 }