10用d编程--当

import std.stdio;
import std.random;

void main() {
    int number = uniform(1, 101);//`std.random`中

    writeln("I am thinking of a number between 1 and 100.");

    int guess;

    do {
        write("What is your guess? ");

        readf(" %s", &guess);

        if (number < guess) {
            write("My number is less than that. ");

        } else if (number > guess) {
            write("My number is greater than that. ");
        }

    } while (guess != number);

    writeln("Correct!");
}

关联数组:就是c++的无序映<,>.

 // key : value
    int[string] dayNumbers =
        [ "Monday"   : 0, "Tuesday" : 1, "Wednesday" : 2,
          "Thursday" : 3, "Friday"  : 4, "Saturday"  : 5,
          "Sunday"   : 6 ];

    writeln(dayNumbers["Tuesday"]);    // prints 1
//在
    int[string] colorCodes = [ /* ... */ ];

    if ("purple" in colorCodes) {//在
        // key "purple" exists in the table

    } else {
        // key "purple" does not exist in the table
    }

不在,取默认值:

    int [string] colorCodes = [ "blue":10,"green":20];
    writeln(colorCodes.get("purple",-1));

常用属性:
.length,长度
.keys,复制返回动态数组
.byKey,不复制,
.values,值,复制,动态
.byValue,不复制
.byKeyValue,不复制,
.rehash,再哈希,大量插入后,改一改,更有效
.sizeof,数组引用大小.
.get,取
.remove,删
.clear,清理所有

每一,迭代的是容器/区间/类/

foreach (value; aa) {
    writeln(value);
}//aa为关联数组
    foreach (key; aa.byKey) {
        writeln(key);
    }//按键
    foreach (element; aa.byKeyValue) {
        writefln("The value for key %s is %s",
                 element.key, element.value);
    }//按键值
    foreach (number; 10..15) {
        writeln(number);
    }//数字区间,

structs, classes, and ranges,也可以opApply,来循环.
要这样用

    foreach (ref number; numbers) {//加个引号
        number *= 2;
    }//不然,是复制的元素,不是自身
    auto container = [ 1, 2, 3 ];

    foreach_reverse (element; container) {
        writefln("%s ", element);
    }//逆向