diff --git a/Cargo.lock b/Cargo.lock
index 8295e51..0f5c5ba 100755
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,4 +1,23 @@
 [root]
 name = "hello_world"
 version = "0.0.1"
+dependencies = [
+ "rand 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
+[[package]]
+name = "libc"
+version = "0.2.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "rand"
+version = "0.3.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[metadata]
+"checksum libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)" = "88ee81885f9f04bff991e306fea7c1c60a5f0f9e409e99f6b40e3311a3363135"
+"checksum rand 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)" = "022e0636ec2519ddae48154b028864bdce4eaf7d35226ab8e65c611be97b189d"
diff --git a/Cargo.toml b/Cargo.toml
index 09819c8..abd9f0f 100755
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,6 +4,12 @@ name = "hello_world"
 version = "0.0.1"
 authors = [ "Clara Benedicta Maria Mueller <clara.mueller@vilera.de>" ]
 
+
 [[bin]]
-name = "test"
-path = "/media/win_e/Clara_Daten/etc/Programmierung/Rust/src/test.rs"
+name = "main"
+path = "/media/win_e/Clara_Daten/etc/Programmierung/Rust/src/main.rs"
+
+
+[dependencies]
+
+rand="0.3.0"
diff --git a/Cargo.toml_backup b/Cargo.toml_backup
new file mode 100755
index 0000000..5b9e98a
--- /dev/null
+++ b/Cargo.toml_backup
@@ -0,0 +1,15 @@
+[package]
+
+name = "hello_world"
+version = "0.0.1"
+authors = [ "Clara Benedicta Maria Mueller <clara.mueller@vilera.de>" ]
+
+
+[[bin]]
+name = "test"
+path = "/media/win_e/Clara_Daten/etc/Programmierung/Rust/src/test.rs"
+
+
+[dependencies]
+
+rand="0.3.0"
diff --git a/main.rs b/main.rs
new file mode 100755
index 0000000..c8c0ba2
--- /dev/null
+++ b/main.rs
@@ -0,0 +1,56 @@
+// another rust programm
+// let's get started ^.^
+
+extern crate rand; // actually using rand (declared in dependencies of 'Cargo.toml')
+
+// rust only uses few things by default ('prelude') -> add your needs!
+use std::io; // use io library from the standard library
+use std::cmp::Ordering; // use ordering type
+use rand::Rng; // using rands function rand::thread_rng()
+
+
+// main function
+fn main() { 
+    println!("guess a number!"); // macro, prints string
+    
+    let secret_number = rand::thread_rng() // get copy of random number generator
+        .gen_range(1, 101); // methods takes 2 arguments -> generate random number between (inclusive on the lower bound, but exclusive on the upper bound -> 1 - 100)
+
+    // println!("The secret number is: {}", secret_number); // print out secret number // just for testing -> runs the game!
+    
+    
+    loop { // building infinity loop
+    
+        println!("please input your guess!."); // macro, prints string
+
+        let mut guess = String::new(); // let -> create 'variable bindings'; String -> string type (UTF-8 encoded bit of text); '::' -> associate function; 'new()' -> created empty
+        let foo = 5; // 'foo' is immutable
+        let mut bar = 5; //'bar' is mutable
+        
+        io::stdin().read_line(&mut guess) // calling associated function // without std::io -> written 'std::io::stdin()' //returns handle to standard input
+            // read_line() -> calling method (like associate function, only on parcticular instant of type) an handle
+            // read_line():&mut guess -> passing argument to mutable reference of guess
+            .expect("failed to read line"); // io::Result encodes error handling information // not successful -> panic! with message "failed to read line"
+        // alternative written: 'io::stdin().read_line(&mut guess).expect("failed to read line");'
+        
+        // let guess: u32 = guess.trim().parse() // 'shadow' guess with new one -> convert string into u32 // 'trim()' eliminates whitespace // 'prase()' -> parses string into number
+            // .expect("Please type a number!"); // stop programm if not a number
+        
+        let guess: u32 = match guess.trim().parse() { // 'handling error' -> 'match' instead 'expect()' // result returned by prase()
+            Ok(num) => num, // success -> set name num on unwrapped Ok value (integer)
+            Err(_)  => continue, // failure -> don't care of kind of error -> catch all _(everything not ok) // 'continue' -> move to next iteration of loop (aka ignore all errors)
+        };
+        
+        println!("you guessed: {}", guess); // print out saved string from STDIN
+        println!("FOO: {} & BAR: {}", foo, bar); // print out string variables
+        
+        match guess.cmp(&secret_number) { // cmp can called on anything comparable, takes references to thing to compare // returns odering type // match -> determine exactly what typ of ordering (ordering = enum (enumeration)) // guess + secret_number have to be same type for comparision!
+                Ordering::Less      => println!("To small!"), // ordering enum -> 3 possible variants (less/greater/equal)
+                Ordering::Greater   => println!("To big!"),
+                Ordering::Equal     => {
+                    println!("You win!");
+                    break;
+                }
+        }
+    }
+}
diff --git a/target/debug/.fingerprint/hello_world-0c8f4da7f93c9c5c/bin-main-0c8f4da7f93c9c5c b/target/debug/.fingerprint/hello_world-0c8f4da7f93c9c5c/bin-main-0c8f4da7f93c9c5c
new file mode 100755
index 0000000..6b1cf37
--- /dev/null
+++ b/target/debug/.fingerprint/hello_world-0c8f4da7f93c9c5c/bin-main-0c8f4da7f93c9c5c
@@ -0,0 +1 @@
+17a9309d5cd6c961
\ No newline at end of file
diff --git a/target/debug/.fingerprint/hello_world-0c8f4da7f93c9c5c/bin-main-0c8f4da7f93c9c5c.json b/target/debug/.fingerprint/hello_world-0c8f4da7f93c9c5c/bin-main-0c8f4da7f93c9c5c.json
new file mode 100755
index 0000000..ec1d3f2
--- /dev/null
+++ b/target/debug/.fingerprint/hello_world-0c8f4da7f93c9c5c/bin-main-0c8f4da7f93c9c5c.json
@@ -0,0 +1 @@
+{"rustc":9749998217168482212,"target":17950575461743581120,"profile":14528549471338536373,"local":{"variant":"MtimeBased","fields":[[1492077381,811763100],[47,109,101,100,105,97,47,119,105,110,95,101,47,67,108,97,114,97,95,68,97,116,101,110,47,101,116,99,47,80,114,111,103,114,97,109,109,105,101,114,117,110,103,47,82,117,115,116,47,115,114,99,47,116,97,114,103,101,116,47,100,101,98,117,103,47,46,102,105,110,103,101,114,112,114,105,110,116,47,104,101,108,108,111,95,119,111,114,108,100,45,48,99,56,102,52,100,97,55,102,57,51,99,57,99,53,99,47,100,101,112,45,98,105,110,45,109,97,105,110,45,48,99,56,102,52,100,97,55,102,57,51,99,57,99,53,99]]},"features":"None","deps":[["rand v0.3.15",127043405904794477]],"rustflags":[]}
\ No newline at end of file
diff --git a/target/debug/.fingerprint/hello_world-0c8f4da7f93c9c5c/dep-bin-main-0c8f4da7f93c9c5c b/target/debug/.fingerprint/hello_world-0c8f4da7f93c9c5c/dep-bin-main-0c8f4da7f93c9c5c
new file mode 100755
index 0000000..f98c291
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diff --git a/target/debug/.fingerprint/hello_world-943817d46c044558/bin-test-943817d46c044558 b/target/debug/.fingerprint/hello_world-943817d46c044558/bin-test-943817d46c044558
index a88d065..2e93f5b 100755
--- a/target/debug/.fingerprint/hello_world-943817d46c044558/bin-test-943817d46c044558
+++ b/target/debug/.fingerprint/hello_world-943817d46c044558/bin-test-943817d46c044558
@@ -1 +1 @@
-6d8524286a203399
\ No newline at end of file
+430c19affbf6a977
\ No newline at end of file
diff --git a/target/debug/.fingerprint/hello_world-943817d46c044558/bin-test-943817d46c044558.json b/target/debug/.fingerprint/hello_world-943817d46c044558/bin-test-943817d46c044558.json
index 859500c..f9a940e 100755
--- a/target/debug/.fingerprint/hello_world-943817d46c044558/bin-test-943817d46c044558.json
+++ b/target/debug/.fingerprint/hello_world-943817d46c044558/bin-test-943817d46c044558.json
@@ -1 +1 @@
-{"rustc":9749998217168482212,"target":10994546209011070589,"profile":14528549471338536373,"local":{"variant":"MtimeBased","fields":[[1492017954,643537700],[47,109,101,100,105,97,47,119,105,110,95,101,47,67,108,97,114,97,95,68,97,116,101,110,47,101,116,99,47,80,114,111,103,114,97,109,109,105,101,114,117,110,103,47,82,117,115,116,47,115,114,99,47,116,97,114,103,101,116,47,100,101,98,117,103,47,46,102,105,110,103,101,114,112,114,105,110,116,47,104,101,108,108,111,95,119,111,114,108,100,45,57,52,51,56,49,55,100,52,54,99,48,52,52,53,53,56,47,100,101,112,45,98,105,110,45,116,101,115,116,45,57,52,51,56,49,55,100,52,54,99,48,52,52,53,53,56]]},"features":"None","deps":[],"rustflags":[]}
\ No newline at end of file
+{"rustc":9749998217168482212,"target":10994546209011070589,"profile":14528549471338536373,"local":{"variant":"MtimeBased","fields":[[1492072499,359251700],[47,109,101,100,105,97,47,119,105,110,95,101,47,67,108,97,114,97,95,68,97,116,101,110,47,101,116,99,47,80,114,111,103,114,97,109,109,105,101,114,117,110,103,47,82,117,115,116,47,115,114,99,47,116,97,114,103,101,116,47,100,101,98,117,103,47,46,102,105,110,103,101,114,112,114,105,110,116,47,104,101,108,108,111,95,119,111,114,108,100,45,57,52,51,56,49,55,100,52,54,99,48,52,52,53,53,56,47,100,101,112,45,98,105,110,45,116,101,115,116,45,57,52,51,56,49,55,100,52,54,99,48,52,52,53,53,56]]},"features":"None","deps":[["rand v0.3.15",127043405904794477]],"rustflags":[]}
\ No newline at end of file
diff --git a/target/debug/.fingerprint/libc-5dc7b85e748840b4/dep-lib-libc-5dc7b85e748840b4 b/target/debug/.fingerprint/libc-5dc7b85e748840b4/dep-lib-libc-5dc7b85e748840b4
new file mode 100755
index 0000000..ce78b54
Binary files /dev/null and b/target/debug/.fingerprint/libc-5dc7b85e748840b4/dep-lib-libc-5dc7b85e748840b4 differ
diff --git a/target/debug/.fingerprint/libc-5dc7b85e748840b4/lib-libc-5dc7b85e748840b4 b/target/debug/.fingerprint/libc-5dc7b85e748840b4/lib-libc-5dc7b85e748840b4
new file mode 100755
index 0000000..03665ea
--- /dev/null
+++ b/target/debug/.fingerprint/libc-5dc7b85e748840b4/lib-libc-5dc7b85e748840b4
@@ -0,0 +1 @@
+20054fec61dda75a
\ No newline at end of file
diff --git a/target/debug/.fingerprint/libc-5dc7b85e748840b4/lib-libc-5dc7b85e748840b4.json b/target/debug/.fingerprint/libc-5dc7b85e748840b4/lib-libc-5dc7b85e748840b4.json
new file mode 100755
index 0000000..416741c
--- /dev/null
+++ b/target/debug/.fingerprint/libc-5dc7b85e748840b4/lib-libc-5dc7b85e748840b4.json
@@ -0,0 +1 @@
+{"rustc":9749998217168482212,"target":12335968779674043000,"profile":14528549471338536373,"local":{"variant":"Precalculated","fields":["0.2.21"]},"features":"Some([\"default\", \"use_std\"])","deps":[],"rustflags":[]}
\ No newline at end of file
diff --git a/target/debug/.fingerprint/rand-c9d9fbdab2355ee4/dep-lib-rand-c9d9fbdab2355ee4 b/target/debug/.fingerprint/rand-c9d9fbdab2355ee4/dep-lib-rand-c9d9fbdab2355ee4
new file mode 100755
index 0000000..e8b8b3b
Binary files /dev/null and b/target/debug/.fingerprint/rand-c9d9fbdab2355ee4/dep-lib-rand-c9d9fbdab2355ee4 differ
diff --git a/target/debug/.fingerprint/rand-c9d9fbdab2355ee4/lib-rand-c9d9fbdab2355ee4 b/target/debug/.fingerprint/rand-c9d9fbdab2355ee4/lib-rand-c9d9fbdab2355ee4
new file mode 100755
index 0000000..e21bdb8
--- /dev/null
+++ b/target/debug/.fingerprint/rand-c9d9fbdab2355ee4/lib-rand-c9d9fbdab2355ee4
@@ -0,0 +1 @@
+6dd302f84d59c301
\ No newline at end of file
diff --git a/target/debug/.fingerprint/rand-c9d9fbdab2355ee4/lib-rand-c9d9fbdab2355ee4.json b/target/debug/.fingerprint/rand-c9d9fbdab2355ee4/lib-rand-c9d9fbdab2355ee4.json
new file mode 100755
index 0000000..8d02bb2
--- /dev/null
+++ b/target/debug/.fingerprint/rand-c9d9fbdab2355ee4/lib-rand-c9d9fbdab2355ee4.json
@@ -0,0 +1 @@
+{"rustc":9749998217168482212,"target":16630976334449306048,"profile":14528549471338536373,"local":{"variant":"Precalculated","fields":["0.3.15"]},"features":"None","deps":[["libc v0.2.21",6532433197170361632]],"rustflags":[]}
\ No newline at end of file
diff --git a/target/debug/deps/liblibc-5dc7b85e748840b4.rlib b/target/debug/deps/liblibc-5dc7b85e748840b4.rlib
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index 0000000..132e437
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diff --git a/target/debug/deps/librand-c9d9fbdab2355ee4.rlib b/target/debug/deps/librand-c9d9fbdab2355ee4.rlib
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index 0000000..c8c50be
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diff --git a/target/debug/deps/main-0c8f4da7f93c9c5c b/target/debug/deps/main-0c8f4da7f93c9c5c
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index 0000000..8242c16
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diff --git a/target/debug/main b/target/debug/main
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index 0000000..8242c16
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diff --git a/target/debug/main.d b/target/debug/main.d
new file mode 100755
index 0000000..9a25e52
--- /dev/null
+++ b/target/debug/main.d
@@ -0,0 +1 @@
+/media/win_e/Clara_Daten/etc/Programmierung/Rust/src/target/debug/main: /media/win_e/Clara_Daten/etc/Programmierung/Rust/src/main.rs