好久么弄C++了，好像也没在项目中正式的用过C++了，这里复习下。先复习下string。
CONTENTS
API：
http://www.cplusplus.com/reference/string/string/
上面这个网址内容非常好，每个函数都有实例。
学习代码：
#include <iostream>
#include<string>
//http://www.cplusplus.com/reference/string/string/
std::cout<<"Hello World\n";
std::string s1 = "hello";
std::string s2("world");
std::string s3 = s1 + " " + s2;
std::cout<<s1<<std::endl;
std::cout<<s2<<std::endl;
std::cout<<s3<<std::endl;
std::string s4 = "hello world";
std::cout<<(s3 == s4 ? "same":"different")<<std::endl;
std::cout<<"s4[2]:"<<s4[2]<<std::endl;
s4[2] = 'x';
std::cout<<"s4[2]:"<<s4[2]<<std::endl;
std::cout<<(s4.empty()? "YES":"NO")<<std::endl;
std::cout<<"s4.length():"<<s4.length()<<std::endl;
s4.clear();
std::cout<<(s4.empty()? "YES":"NO")<<std::endl;
std::cout<<"s4.length():"<<s4.length()<<std::endl;
s4 = "hello world";
std::string::size_type pos = s4.find("l");
if (std::string::npos == pos)
{
std::cout<<"not find \n";
}else
{
std::cout<<"pos:"<<pos<<std::endl;
}
pos = s4.rfind("l");
if (std::string::npos == pos)
{
std::cout<<"not find \n";
}else
{
std::cout<<"pos:"<<pos<<std::endl;
}
pos = s4.find_first_of("l");
if (std::string::npos == pos)
{
std::cout<<"not find \n";
}else
{
std::cout<<"pos:"<<pos<<std::endl;
}
std::cout<<s4<<std::endl;
s4.insert(0,"~~NEW~~");
std::cout<<s4<<std::endl;
s4.erase(0,5);
std::cout<<s4<<std::endl;
s4.replace(0,5,"12345");
std::cout<<s4<<std::endl;
s4.append("This is tail");
std::cout<<s4<<std::endl;
s4 = s4.substr(2,3);
std::cout<<s4<<std::endl;
//Searches the string for the first character that matches 【any】 of the characters specified in its arguments.
std::string str ("Please, replace the vowels in this sentence by asterisks.");
std::size_t found = str.find_first_of("aeiou");
while (found!=std::string::npos)
{
str[found]='*';
found=str.find_first_of("aeiou",found+1);
}
std::cout << str << '\n';
输出：
Hello World hello world hello world same s4[2]:l s4[2]:x NO s4.length():11 YES s4.length():0 pos:2 pos:9 pos:2 hello world ~~NEW~~hello world ~~hello world 12345lo world 12345lo worldThis is tail 345 Pl**s*, r*pl*c* th* v*w*ls *n th*s s*nt*nc* by *st*r*sks.
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