update at 2020-06-16 18:18:40 by ehlxr

src/main.rs

@@ -937,7 +937,7 @@ fn main() {
     println!("{}", s);
     let mut s: String = "Hello".to_string();
     let w = "World";
-    s.push_str(w);// 并不需要获取 w 的所有权
+    s.push_str(w); // 并不需要获取 w 的所有权
     s.push('!');
     println!("{} {}", s, w);
 
@@ -951,15 +951,18 @@ fn main() {
                        // println!("{} {} {}", s1, s3, s2);
     println!("{} {}", s3, s2);
 
-    for c in "नमˑे".chars() {
+    let hello = "测试中文字符串";
-        println!("{}", c);
+    for c in hello.chars() {
+        print!("{} ", c);
     }
-    for b in "नमˑे".bytes() {
+    println!("");
-        println!("{}", b);
+    for b in hello.bytes() {
+        print!("{} ", b);
     }
-    let hello = "Здравствуйте";
+    println!("");
-    let s = &hello[0..4];
+    // let s = hello[1]; // Rust 的字符串不支持索引
-    println!("&hello[0..4]={}", s);
+    // let s = &hello[0..4]; // thread 'main' panicked at 'byte index 4 is not a char boundary; it is inside '试' (bytes 3..6) of `测试中文字符串`', src/libcore/str/mod.rs:2219:5
+    print!("{}", &hello[0..3]);
 }
 
 fn test_tuple(t: (i32, &str)) {
@@ -1265,7 +1268,7 @@ impl ToString for Tweet {
 //}
 
 fn notify<T, U>(t: &T, u: &U) -> String
-    where
+where
     T: Summary + ToString,
     U: Summary,
 {
@@ -1335,7 +1338,7 @@ fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
 }
 
 struct Cacher<T, D, F>
-    where
+where
     T: Fn(&D) -> F,
 {
     calculation: T,
@@ -1343,7 +1346,7 @@ struct Cacher<T, D, F>
 }
 
 impl<T, D, F> Cacher<T, D, F>
-    where
+where
     D: Hash + Eq,
     F: Copy,
     T: Fn(&D) -> F,