C++ 常用类 string类

===6.3.2使用string对象===

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

word[index];

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

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

sentence.rfind("man");

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

===6.3.8注意事项===

1） append函数与char 和char*

append函数的原型如下：

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，如果仅仅想增加一个字符，使用push_back即可

string 详解

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 <iostream>
#include <string>

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 string
s3: str
s4: A char
s5: Another character sequence
s6: xxxxxxxxxx
s7a: **********
s7b: Initial

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C++ 常用类 string类

原文：http://blog.csdn.net/trochiluses/article/details/30221317