pub fn add_num(n1:i32,n2:i32)->i32{
n1+n2
}
fn main() {
let x=12;
let y=9;
let z1=&add_num(x,y);
println!("{}",z1);
}
rustc learn1.rs
learn1.exe
.\learn1.exe
21
pub fn is_even(num:i32)->bool{
if num%2==0 {
return true;
}
else{
return false;
}
}
fn main() {
let x=12;
// let y=9;
if is_even(x){
println!("{}是偶数",x);
}
}
pub fn is_div(n1:i32,n2:i32)->bool{
if n1%n2==0 {
return true;
}
else{
return false;
}
}
fn main() {
let x=12;
let y=9;
if is_div(x,y){
println!("{}被{}整除",x,y);
}
assert_eq!(is_div(x,y),true);
}
rustc learn1.rs
.\learn1.exe
thread 'main' panicked at 'assertion failed: `(left == right)`
left: `false`,
right: `true`', learn1.rs:17:2
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
作用域,在括号内是单独的作用域
pub fn is_div(n1:i32,n2:i32)->bool{
if n1%n2==0 {
return true;
}
else{
return false;
}
}
fn main() {
let x=12;
let y=9;
if is_div(x,y){
println!("{}被{}整除",x,y);
}
{
let y=4;
if is_div(x,y){
println!("{}被{}整除",x,y);
}
}
if !is_div(x,y){
println!("{}不被{}整除",x,y);
}
assert_eq!(is_div(x,y),true);
}
rustc learn1.rs
PS F:\learn\rustlearn> .\learn1.exe
12被4整除
12不被9整除
thread 'main' panicked at 'assertion failed: `(left == right)`
left: `false`,
right: `true`', learn1.rs:27:2
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.