Adding functions, loops and variables examples

Author: chanakaudaya

functions/Cargo.toml

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+[package]
+name = "functions"
+version = "0.1.0"
+authors = ["Chanaka Fernando <[email protected]>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

functions/src/main.rs

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+fn main() {
+    println!("Hello, world!");
+
+    another_function(50);
+
+    println!("Value from five() function is {}", five());
+
+    let x = plus_one(5);
+
+    println!("The value of x is: {}", x);
+
+    // If condition check
+    let x = 3;
+    if x < 5 {
+        println!("Condition is true!")
+    } else {
+        println!("Condition is false!");
+    }
+}
+
+fn plus_one(x: i32) -> i32 {
+    x + 1
+}
+
+fn another_function(x :i32) {
+    println!("Another function. value of x is {}", x);
+}
+
+fn five() -> i32 {
+    5
+}
+
+

loops/Cargo.toml

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+[package]
+name = "loops"
+version = "0.1.0"
+authors = ["Chanaka Fernando <[email protected]>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

loops/src/main.rs

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+fn main() {
+    println!("Hello, loops!");
+    let mut counter = 0;
+
+    let result = loop {
+        counter += 1;
+
+        if counter == 10 {
+            break counter * 5;
+        }
+    };
+
+    println!("Value returned from loop is {}", result);
+    while_test();
+    loop_collection();
+    for_loop();
+    for_loop_range();
+
+}
+
+fn while_test() {
+    println!("Staring the while loop");
+    let mut x = 3;
+    while x != 0 {
+        println!("{}!", x);
+        x -= 1;
+    }
+    println!("LIFTOFF!!!");
+}
+
+fn loop_collection() {
+    println!("Starting the looping through the collection");
+    let a = [10,20,30,40,50];
+    let mut index = 0;
+
+    while index < 5 {
+        println!("the value is {}", a[index]);
+        index += 1;
+    }
+    println!("LIFTOFF!!!");
+}
+
+fn for_loop() {
+    println!("Staring the for loop test");
+    let a = [1,2,3,4,5];
+    
+    for element in a.iter() {
+        println!("the value is {}!", element);
+    }
+    println!("LIFTOFF!!!");
+}
+
+fn for_loop_range() {
+    println!("Staring the for loop with range test");    
+    for number in (1..4).rev() {
+        println!("the value is {}!", number);
+    }
+    println!("LIFTOFF!!!");
+}
+
+

variables/Cargo.toml

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+[package]
+name = "variables"
+version = "0.1.0"
+authors = ["Chanaka Fernando <[email protected]>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

variables/src/main.rs

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+fn main() {
+    println!("Hello, variables!");
+    let mut x = 5;
+    println!("Value of x is {}", x);
+    x = 6;
+    println!("Value of x is now {}", x);
+
+    let x = 5;
+
+    let x = x + 1;
+
+    let x = x * 2;
+
+    println!("The value of x is: {}", x);
+
+    toupleLearn();
+}
+
+fn toupleLearn() {
+
+    println!("Learning tuples in Rust");
+
+    let tup = (500, 6.4, 1);
+
+    let (x, y, z) = tup;
+
+    println!("The value of y is: {}", y);
+}