Xx_Introduction Use pointer translate parameter array original data will change data,and use const protect array data. Ax_Code #include <stdio.h> #define SIZE 5 void show_array(double ar[], int n); void mult_array(double ar[], int n, double mult); i…
这里以int类型为例,进行说明,在C++中const是类型修饰符: int a; 定义一个普通的int类型变量a,可对此变量的值进行修改. const int a = 3;与 int const a = 3; 这两条语句都是有效的code,并且是等价的,说明a是一个常量,不能对此常量的值进行修改. const int* p =&a; 与 int const* p = &a; 这两条语句都是有效的code,但是它们不是等价的.其中const int* p = &a; 是平时经常使用的…
Functor composition is a powerful concept that arises when we have one Functor nested in another Functor. It becomes even more powerful when both of those are Chains, allowing us to apply each Functor’s special properties and effects for a given comp…
We want to be able to pick nine random cards from an array of twelve cards, but can run into problems of keeping both the cards already draw and the cards left to draw from. Tracking two bits of state like this can create some hard to maintain argume…
To make an array uniqued, we can use Set() from Javascript. const ary = ["a", "b", "c", "a", "d", "c"]; console.log(new Set(ary)); We can see that all the duplicated value have been removed, now…
no for & 100 Array http://hiluluke.cn/ bad function generate100Array() { var arr = new Array(100); for(var i = 0; i < 100; i++){ arr[i]=''; } return arr; } var a = generate100Array(), b = generate100Array(); console.time('for'); for (var i = 0; i &…
nsertion sort is another sorting algorithm that closely resembles how we might sort items in the physical world. We start at the second item in our collection and make the assumption that this item is a sorted list of length 1. We then compare all th…
In my last column, I discussed one of the reasons why the rules by which a compiler can place data into ROM are a bit more complicated in C++ than they are in C. I have more to say about that subject, but before I do, I’d like to reply to the followi…
