1 #include <iostream> 2 #include <string> 3 4 using namespace std; 5 int main() 6 { 7 string s("hello"); 8 string s2("abcdef"); 9 10 string::iterator p = s.begin(); 11 cout << *p << endl; 12 s.insert(p, 'A'); //插入之后，p指向新插入的数据 13 cout << *p << endl; 14 cout << s << endl; 15 16 //每执行插入操作一次，gcc下必须重新给迭代器赋值 17 //否则内存泄漏 18 // 为什么呢？不明白 19 p = s.begin(); 20 s.insert(p,'B'); 21 cout << *p << endl; 22 cout << s << endl; 23 24 string::iterator b = s2.begin(); 25 string::iterator e = s2.end(); 26 27 p = s.begin(); 28 s.insert(p, b, e); 29 cout << s << endl; 30 31 s = "hello"; 32 cout << s <<endl; 33 s.assign(b, e); 34 cout << s <<endl; 35 36 s.assign(8, 'k'); 37 cout << s <<endl; 38 39 s = "abcdef"; 40 p = s.begin(); 41 s.erase(p); //删除 42 cout << s <<endl; 43 44 p = s.begin(); 45 p++; 46 p++; 47 string::iterator p2 = s.end(); 48 p2--; 49 s.erase(p, p2); 50 cout << s <<endl; 51 52 s = "hello"; 53 s2 = "abc"; 54 s.insert(0, 3, 'A'); 55 cout << s <<endl; 56 57 s.insert(5, s2); //位置从0开始，第6个元素之前 58 cout << s <<endl; 59 60 s2 = "12345"; 61 s.insert(0, s2, 2, 3); 62 cout << s <<endl; 63 64 char *cp = "Stately plump Buck"; 65 s.assign(cp, 7); 66 cout << s <<endl; 67 s.assign(cp); 68 cout << s <<endl; 69 70 s = "hello"; 71 s.insert(0, cp, 7); 72 cout << s <<endl; 73 s = "hello"; 74 s.insert(0, cp); 75 cout << s <<endl; 76 77 s = "hello"; 78 s2 = "abcdef"; 79 s.assign(s2, 2, 3); 80 cout << s << endl; 81 82 s.erase(2, 3); 83 cout << s <<endl; 84 85 s = "123456789"; 86 s.erase(s.size()-5, 1); //删除字符串的倒数第5个； 87 cout << s <<endl; 88 89 s.insert(s.size(), 5, '!'); //size()最后一个的后一个，insert在size（）之前插入； 90 cout << s <<endl; 91 92 s = "abc"; 93 s.erase(0, 1).insert(0, "A"); 94 cout << s <<endl; 95 96 s = "abc"; 97 s[0] = 'A'; 98 cout << s <<endl; 99 return 0; 100 } 101
只适合string的操作：
获取子串：substr（）函数；--------3个重载函数
替换函数：replace（）函数；-------6个重载函数
尾加函数：append（）函数;--------10个重载函数；
1 #include <iostream> 2 #include <string> 3 4 using namespace std; 5 6 int main() 7 { 8 string s("hello world"); 9 string s2 = s.substr(6, 5); //从第7个位置开始的5个字符； 10 string s3 = s.substr(6, 50); //从第7个位置开始的50个字符,实际上达不到50个； 11 cout << s3 << endl; 12 13 s2 = s.substr(6); 14 cout << s2 << endl; 15 16 s = "C++ Primer"; 17 s.append(" 3rd Ed. "); 18 cout << s << endl; 19 20 s.insert(s.size(), " 3rd Ed. "); 21 cout << s << endl; 22 23 s.replace(11, 3, "4th"); //字符串替换 24 cout << s << endl; 25 26 s.replace(11, 3, "AAAAAA"); 27 cout << s << endl; 28 29 return 0; 30 }
1 #include <iostream> 2 #include <string> 3 4 using namespace std; 5 6 int main() 7 { 8 string name("AnnmaBelle"); 9 string::size_type pos1= name.find("Bell"); 10 if(pos1 == string::npos){ 11 cout << "not find" << endl; 12 }else{ 13 cout << "find it, pos: " << pos1 << endl; //pos1 = 4; 14 } 15 16 name = "r2d3"; 17 string num("0123456789"); 18 string::size_type pos = 0; 19 //find_first_of(), 查找name中的任意一个字符即返回； 20 //查找name中数字,反之可以找字母 21 //与之对应的是：find_last_of 22 while((pos = name.find_first_of(num, pos))!=string::npos){ 23 cout << name[pos] << endl; 24 pos++; 25 } 26 27 //find_first_not_of(),从num中查找name中字符，没有找到即返回string::npos 28 //与之对应的是：find_last_not_of 29 pos = 0; 30 while((pos=name.find_first_not_of(num, pos))!=string::npos){ 31 cout << name[pos] << endl; 32 ++pos; 33 } 34 35 string river("Mississippi"); 36 string::size_type first_pos = river.find("is"); //从前向后操作，找到第一个即返回,返回值是下标 37 if(first_pos != string::npos) 38 cout <<"first_pos: "<< first_pos << endl; 39 first_pos = river.rfind("is"); //从后向前操作，找到第一个即返回,返回值是下标 40 if(first_pos != string::npos) 41 cout <<"last_pos: "<< first_pos << endl; 42 43 return 0; 44 }
