dfadsfa
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body > *:last-child {
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a {
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a.absent {
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a.anchor {
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body > h1:first-child {
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body > h1:first-child + h2 {
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li {
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padding-left: 30px; }
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font-size: 14px;
font-weight: bold;
font-style: italic;
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margin: 15px 0 5px; }
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dl dt > :first-child {
margin-top: 0; }
dl dt > :last-child {
margin-bottom: 0; }
dl dd {
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padding: 0 15px; }
dl dd > :first-child {
margin-top: 0; }
dl dd > :last-child {
margin-bottom: 0; }
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border-left: 4px solid #dddddd;
padding: 0 15px;
color: #777777; }
blockquote > :first-child {
margin-top: 0; }
blockquote > :last-child {
margin-bottom: 0; }
table {
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table tr {
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background-color: white;
margin: 0;
padding: 0; }
table tr:nth-child(2n) {
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font-weight: bold;
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table tr th :last-child, table tr td :last-child {
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img {
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span.frame > span {
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margin: 13px 0 0;
padding: 7px;
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}
/**
* prism.js tomorrow night eighties for JavaScript, CoffeeScript, CSS and HTML
* Based on https://github.com/chriskempson/tomorrow-theme
* @author Rose Pritchard
*/
code[class*="language-"],
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color: #ccc;
background: none;
font-family: Consolas, Monaco, ‘Andale Mono‘, ‘Ubuntu Mono‘, monospace;
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white-space: pre;
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word-break: normal;
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line-height: 1.5;
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/* Inline code */
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Linux 下C++学习笔记1
string 表示可变长的字符序列，vector 存放的是某种给定类型对象的可变序列。
C++ 标准要求，vector 应该能在运行时搞笑快速的添加元素。因此既然vector 对象能高效的增长，那么在定义vector对象时，设定其大小也就没有什么必要了，事实上如果这么做，性能可能会更差。
范围for 语句体内不应该改变其所遍历对象序列的大小
#include <iostream>
#include <string>
#include <vector>
using std::cin;
using std::cout;
using std::endl;
using std::string;
using std::vector;
vector<int> test_int;
int main()
{
for (int i=0; i < 100; ++i) {
test_int.push_back(i);
}
for (int j : test_int) {
cout << j << endl;
}
return 0;
}不能将数组的内容拷贝给其他数组作为初始值，也不能用数组为其他数组赋值。
指针加上一个整数所得的结果还是一个指针
使用数组的时候其实真正用的是指向数组首元素的指针。
对于大多数应用来说，使用标准库string要比使用C风格字符串更加安全、更加高效
现代的C++ 程序应当尽量使用vector 和迭代器，避免使用内置数组和指针；应该尽量使用string，避免使用C风格的基于数组的字符串。
严格来说，C++中没有多维数组，通常所说的多维数组其实是数组的数组。谨记这一点，对今后理解和使用多维数组大有益处。
//遍历多维数组
int main()
{
//大小为1的数组，每个数组中含有2个数组元素。
//每个数组元素中含有5个整型值
int test_int[1][2][5] = {
{
{
{1},{2},{3},{4},{5}
},
{
{6},{7},{8},{9},{10}
},
}
};
//遍历多维数组
for (auto &a : test_int) {
for (auto &b : a) {
for (auto c : b) {
cout << c << endl;
}
}
}
return 0;
}要使用范围for语句处理多维数组，除了最内层的循环外，其他所有的循环控制变量都应该是引用类型。
int *ip[4]; // 是个数组，整形指针的数组，含有4个int型指针
int (*ip)[4]; // 是个指针，指向含有4个整数的的数组可以在if switch 、while 、和for 语句的控制结构内定义变量。定义在控制结构当中的变量只在相应的语句内部可见，一旦语句结束，变量也就超出其作用范围了。
PHP 代码
roverliang$ cat demo.php
<?php
for($i=0; $i< 100; $i++ ) {
//do some thing;
}
echo $i.PHP_EOL;
roverliang$ php demo.php
100
roverliang$ C++ 代码
int main()
{
for (int i=0; i < 100; ++i) {
//
}
cout << i << endl;
return 0;
}
//error: use of undeclared identifier 'i'
//cout << i << endl;
^