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fn main() {
println!("Hello, world!");
my_funtion();
println!("{}", with_parameters(12, 13));
let mut string: String = String::from("hello");
string.push_str(" world");
println!("{string}");
let string2 = string;
// This no longer works because string2 now owns it and not string
// let length = calculate_length(&string);
let length = calculate_length(&string2);
{
let _string3 = string2;
}
// This no longer works as the value shifted to _string3 and _string3 was dropped
// let length = calculate_length(&string2);
println!("{length}");
let mut _x: i32 = 5;
let _r: &mut i32 = &mut _x;
*_r += 1;
// This will give an error
// the r was a mutable reference
// there can only be one mutable reference
// so both _x and _r are mutable references to _x
// this gives an error
// println!("{_x}");
println!("{_r}");
let mut account = BankAccount {
owner: "Anand".to_string(),
balance: 10000.64,
};
// Immutable borrow to check balance
account.check_balance();
// Mutable borrow to withdraw money
account.withdraw(12.3);
// Immutable borrow to check balance
account.check_balance();
let hours = 3;
println!("{}", hours * HOURS_TO_SECONDS);
let bs = "bbbbb";
println!("{}", bs);
let bs = bs.len();
println!("{}", bs);
let age = 11;
if age >= 18 {
println!("You can drive");
} else if age >= 10 {
println!("That's a lie");
} else {
println!("You cannot drive");
}
let condition = true;
let inline = if condition {
println!("woah");
15
} else {
6
};
println!("{}", inline);
// Do not do this
// loop {
// println!("hello world");
// }
let mut counter = 0;
let result = loop {
counter += 1;
if counter == 10 {
break counter * 2;
}
};
println!("{}", result);
// Loops can also have labels
let mut count = 0;
'counting_up: loop {
println!("count = {count}");
let mut remaining = 10;
loop {
println!("remaining = {remaining}");
if remaining == 9 {
break;
}
if count == 2 {
break 'counting_up;
}
remaining -= 1;
}
count += 1;
}
while count <= 10 {
println!("count = {count}");
count += 1;
}
let a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
for element in a {
println!("{}", element * 2);
}
}
const HOURS_TO_SECONDS: i32 = 60 * 60;
struct BankAccount {
owner: String,
balance: f64,
}
impl BankAccount {
fn withdraw(&mut self, amt: f64) {
println!("Withdrawing {} from {}.", amt, self.owner);
self.balance -= amt;
}
fn check_balance(&self) {
println!(
"Account owned by {} has balance of {}",
self.owner, self.balance
);
}
}
fn my_funtion() {
println!("Hi there");
}
fn with_parameters(a: i32, b: i32) -> i32 {
a + b
}
fn calculate_length(s: &String) -> usize {
s.len()
}
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