191. Check if any value in a list is larger than a limit
Given a one-dimensional array a, check if any value is larger than x, and execute the procedure f if that is the case
检查列表中是否有任何值大于限制
package main import ( "fmt" ) func f() { fmt.Println("Larger found") } func main() { a := []int{1, 2, 3, 4, 5} x := 4 for _, v := range a { if v > x { f() break } } }
fn main() { let a = [5, 6, 8, -20, 9, 42]; let x = 35; if a.iter().any(|&elem| elem > x) { f() } let x = 50; if a.iter().any(|&elem| elem > x) { g() } } fn f() { println!("F") } fn g() { println!("G") }
192. Declare a real variable with at least 20 digits
Declare a real variable a with at least 20 digits; if the type does not exist, issue an error at compile time.
声明一个至少有20位数字的实变量
package main import ( "fmt" "math/big" ) func main() { a, _, err := big.ParseFloat("123456789.123456789123465789", 10, 200, big.ToZero) if err != nil { panic(err) } fmt.Println(a) }
use rust_decimal::Decimal; use std::str::FromStr; let a = Decimal::from_str("1234567890.123456789012345").unwrap();
197. Get a list of lines from a file
Retrieve the contents of file at path into a list of strings lines, in which each element is a line of the file.
从文件中获取行列表.将文件路径中的内容检索到字符串行列表中，其中每个元素都是文件的一行。
package main import ( "fmt" "io/ioutil" "log" "strings" ) func readLines(path string) ([]string, error) { b, err := ioutil.ReadFile(path) if err != nil { return nil, err } lines := strings.Split(string(b), "\n") return lines, nil } func main() { lines, err := readLines("/tmp/file1") if err != nil { log.Fatalln(err) } for i, line := range lines { fmt.Printf("line %d: %s\n", i, line) } } func init() { data := []byte(`foo bar baz`) err := ioutil.WriteFile("/tmp/file1", data, 0644) if err != nil { log.Fatalln(err) } }
line 0: foo line 1: bar line 2: baz
use std::fs::File; use std::io::prelude::*; use std::io::BufReader; fn main() { let path = "/etc/hosts"; let lines = BufReader::new(File::open(path).unwrap()) .lines() .collect::<Vec<_>>(); println!("{:?}", lines); }
198. Abort program execution with error condition
Abort program execution with error condition x (where x is an integer value)
出现错误情况时中止程序执行
package main import ( "os" ) func main() { x := 1 os.Exit(x) }
Program exited: status 1.
use std::process; process::exit(x);
200. Return hypotenuse
Returns the hypotenuse h of the triangle where the sides adjacent to the square angle have lengths x and y.
返回三角形的斜边h，其中与直角相邻的边的长度为x和y。
package main import ( "fmt" "math" ) func main() { x := 1.0 y := 1.0 h := math.Hypot(x, y) fmt.Println(h) }
fn main() { let (x, y) = (1.0, 1.0); let h = hypot(x, y); println!("{}", h); } fn hypot(x: f64, y: f64) -> f64 { let num = x.powi(2) + y.powi(2); num.powf(0.5) }
