===6.3.2使用string对象===

string word="I love China"

*链接字符串*

string description=adjective  + " " + word;

_Note_: 不能连接两个字符串字面量，以下的语句是错误的

string test= "I have" + "a dream";

===6.3.3訪问字符串中的字符===

*读取字符串*

getline(cin, text);

getline(cin, text, '#')_;

word[index];

===6.3.4訪问子字符串===

* substr(index0, length);

string phrase = "the higher the fewer";

string wold= phrase.substr(4,6 );

===6.3.5比較字符串===

*操作符*

> >= < !=

*compare()*

world.compare("end");

word.compare(2, 4, "end");

===6.3.6搜索字符串:find===

string sentence = "Manners maketh man";

int a= sentence.find("man");

int b= sentence.find("man", index);//从index開始搜索

假设没有找到。返回~~string:npos~~

*搜索字符集*

string separeators= " ,.\"";

sentence.find_first_of(separeators);

sentence.find_last_of(separeators);

sentence.find_last_not_of(separeators);

sentence.find_first_not_of(separeators);

*逆向搜索*

sentence.rfind("man");

===6.3.7改动字符串:insert、replace、erase===

*1.insert*

_`mystring.insert(index, anotherstring)`

sentence.insert(13, world, 8, 5);//从index=8開始之后的5个字符

把几个同样字符串插入到string对象中：sentence.insert(index,times, string);

*2.replace*

将从index開始的num个字符，替换成新的string：sentence.replace(index, num, string);

*3.erase*

删除从index開始的num个字符：sentence.erase(index, num);

===6.3.8注意事项===

1） append函数与char 和char*

append函数的原型例如以下：

string& append (const string& str);	string& append (const string& str, size_t subpos, size_t sublen);	string& append (const char* s);string& append (const char* s, size_t n);	string& append (size_t n, char c);

注意。char* 和char用作append的參数时候。比如，想在string尾部添加一个字符，须要用mystring.append(1, ch) 而不是mystring.apend(ch). 相同。想将chars的当中一部分插入string中。须要用mystring.append(s+a, b-a)

注意，假设只想添加一个字符。使用push_back就可以

string 具体解释

1.*string constructor*

default (1) string(); copy (2) string (const string& str); substring (3) string (const string& str, size_t pos, size_t len = npos); from c-string (4) string (const char* s); from buffer (5) string (const char* s, size_t n); fill (6) string (size_t n, char c); range (7) template <class InputIterator>   string  (InputIterator first, InputIterator last);

// string constructor#include 
    
     #include 
     
      int main (){  std::string s0 ("Initial string");  // constructors used in the same order as described above:  std::string s1;  std::string s2 (s0);  std::string s3 (s0, 8, 3);  std::string s4 ("A character sequence", 6);  std::string s5 ("Another character sequence");  std::string s6 (10, 'x');  std::string s7a (10, 42);      // 42 is the ASCII code for '*'  std::string s7b (s0.begin(), s0.begin()+7);  std::cout << "s1: " << s1 << "\ns2: " << s2 << "\ns3: " << s3;  std::cout << "\ns4: " << s4 << "\ns5: " << s5 << "\ns6: " << s6;  std::cout << "\ns7a: " << s7a << "\ns7b: " << s7b << '\n';  return 0;}**output**:s1: s2: Initial strings3: strs4: A chars5: Another character sequences6: xxxxxxxxxxs7a: **********s7b: Initial
     
    

2.迭代器：
begin();
end();


3.capacity:
size();
length();
clear();
empty();


4.Element Access:
operator[]
at()
back();
front();

5.Modifier
operator+=
append()
push_back()
assign()
insert()
erase()
replcace();
swap();
pop_back();

6.String Operations:
copy();
find();
find_first_of();
find_last_of();
find_first_not_of();
find_last_not_of();
substr();
compare();

7.Member constants:
npos


8.Non-member function overloads:

getline();

本文转自mfrbuaa博客园博客，原文链接：http://www.cnblogs.com/mfrbuaa/p/5183956.html，如需转载请自行联系原作者