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| const ONE_HOUR_IN_SECONDS: u32 = 3600;
#[derive(Drop)]
struct Rectangle {
width: u64,
height: u64
}
#[derive(Drop)]
struct Rectangle1<T> {
width: T,
height: T
}
trait RectangleTrait {
fn area(self: @Rectangle) -> u64;
}
trait RectangleTrait1<T> {
fn area(self: @Rectangle1<T>) -> T;
}
impl RectangleImpl1<T, +Mul<T>, +Copy<T>> of RectangleTrait1<T> {
fn area(self: @Rectangle1<T>) -> T {
*self.width * *self.height
}
}
fn main() {
let mut x = 5;
println!("Hello, world! {}", x);
x = 6;
println!("Hello, world! {}", x);
println!("ONE_HOUR_IN_SECONDS is {ONE_HOUR_IN_SECONDS}");
let mut y: u16 = 10;
y = y / 2;
println!("y is {y}");
let z: u256 = 10;
let l = 5_u8;
println!("z is {z} and l is {l}");
println!("z + l is {}", z + l.into());
println!("l / y is {}", l / y.try_into().unwrap());
let x = 'Hello World';
println!("x is {x}"); // x is 87521618088882533792115812
let x = 25_u16;
println!("{}", format!("https://example.com/{}", x));
let y: ByteArray = "Hello World";
println!("y is {y}");
println!("{y:?}");
println!("{}", sum_three(1, 2, 3));
println!("{}", min(1, 2));
println!("{}", min2(1, 2, 3));
println!("fib: {}", fib(1, 2, 5));
let a = array![1, 2, 3, 4, 5];
println!("sum_array! {}", sum_array(a));
// println!("Arr Len is {}", a.len()); error: Variable was previously moved.
let (a, b, c) = (1, 2, 3);
println!("sum_three: {}", sum_three(a, b, c));
println!("A is {a}");
let arr = array![1, 2, 3, 4, 5];
// println!("arr len is {}", return_len(@arr));
println!("arr len is {}", return_len(arr.span()));
// println!("arr len {}", arr.len()); error: Variable was previously moved.
println!("arr len {}", arr.len());
// 快照传参 @ 会获得变量的不可变引用
// 可变引用传参
println!("sum_array2: {}", sum_array2(arr.span()));
let mut arr = array![1, 2, 3, 4];
println!("sum_array3: {}", sum_array3(ref arr));
println!("arr len is {}", arr.len());
let rectangle = Rectangle { width: 30, height: 50 };
let area = area(@rectangle);
println!("area is {}", area);
println!(
"Width is {}", rectangle.width
); // Variable not dropped. Variable was previously moved.
println!("Rectangle is {}", rectangle);
println!("Area is {}", rectangle.area());
let rectangle1 = Rectangle1 { width: 30_u32, height: 50 };
println!("Area is rectangle1 {}", rectangle1.area());
}
fn sum_three(a: u32, b: u32, c: u32) -> u32 {
a + b + c
}
fn min(a: u32, b: u32) -> u32 {
if a < b {
a
} else {
b
}
}
fn min2(a: u32, b: u32, c: u32) -> u32 {
if (a <= b) & (a <= c) {
a
} else if (b <= a) & (b <= c) {
b
} else {
c
}
}
fn fib(mut a: felt252, mut b: felt252, mut n: felt252) -> felt252 {
loop {
if n == 0 {
break a;
}
n -= 1;
let temp = b;
b = a + b;
a = temp;
}
}
fn sum_array(mut arr: Array<u32>) -> u32 {
let mut sum = 0_u32;
loop {
match arr.pop_front() {
Option::Some(current_value) => { sum += current_value },
Option::None => { break; },
}
};
sum
}
// fn return_len(arr: Array<u32>) -> u32 {
// fn return_len(arr: @Array<u32>) -> u32 {
fn return_len(arr: Span<u32>) -> u32 {
arr.len()
}
fn sum_array2(mut arr: Span<u32>) -> u32 {
let mut sum: u32 = 0;
loop {
match arr.pop_front() {
Option::Some(current_value) => { sum += *current_value },
Option::None => { break; },
}
};
sum
}
fn sum_array3(ref arr: Array<u32>) -> u32 {
let mut sum: u32 = 0;
loop {
match arr.pop_front() {
Option::Some(current_value) => { sum += current_value },
Option::None => { break; },
}
};
sum
}
fn area(rectangle: @Rectangle) -> u64 {
*rectangle.width * *rectangle.height
}
impl RectangleDisplay of core::fmt::Display<Rectangle> {
fn fmt(self: @Rectangle, ref f: core::fmt::Formatter) -> Result<(), core::fmt::Error> {
write!(f, "width: ")?;
core::fmt::Display::fmt(self.width, ref f)?;
write!(f, ", height: ")?;
core::fmt::Display::fmt(self.height, ref f)
}
}
impl RectangleImpl of RectangleTrait {
fn area(self: @Rectangle) -> u64 {
*self.width * *self.height
}
}
#[cfg(test)]
mod tests {
use super::sum_three;
#[test]
fn it_works() {
assert(sum_three(1, 2, 3) == 6, 'Sum Fail');
assert_eq!(sum_three(1, 2, 3), 6);
assert_eq!(sum_three(10, 20, 30), 60);
}
}
// 当我们使用简单类型 （u8 u16 u32） 时， 不需要关注所有权类型，只有报错的时候才关注
// 当遇到所有权的时候，不想改变则使用 @ Span 快照类型 修改则使用 ref 要求是可变的变量 使用 mut
|
