string 字符串 定義和初始化
string s1;string s2(str); //使用構造函數初始化string s3(n,'c'); //s3是有n個連續的c字符組成的字符串string對象上的操作
getline(is,s) //從輸入流中讀取一行字符串賦給ss.empty()s.append(str) //在s末尾加一個字符串s.size()s[i]s1==s2 //如果s1和s2的所含的字符完全一樣，則相等s.length();s.erase(string::iterator it) //刪除it處的字符s.erase(str.begin(),str.end()) //刪除該范圍內的字符reverse(str.begin(),str.end()) //將該范圍內的字符反轉transform(str.begin(),str.end(),str.begin(),toupper)//將begin到end出的字符轉換成大寫字母，并從beign出寫入，小寫是tolower學習代碼
c和c++風格的字符串#include <iostream>#include <string>#PRagma warning(disable:4996)//strcpy不安全被禁用，要想使用采用以下辦法和加上 上面的注釋信息/*其實在下面的輸出錯誤信息中有解決方法，“To disable deprecation , use _CRT_SECURE_NO_WARNINGS”,意思是我們可以不進行兼容性檢查，我們可以在項目-屬性-配置屬性-c/c++-預處理器-預處理定義里邊加上一句：_CRT_SECURE_NO_WARNINGS */int main(){ using namespace std; char pszName[20] = "張飛"; //c風格的字符串 cout << pszName << endl; char *pszName2 = "張飛"; cout << pszName2 << endl; string strName2("劉備"); cout << strName2 << endl; string strName = "張飛"; //運算符重載 cout << strName << endl; const char* pszConstString = "Hello String!"; cout << pszConstString << endl; string strFormatConst(pszConstString); //使用string的構造函數 cout << strFormatConst << endl; string strCopy(pszConstString, 5); //復制前5個字符 cout << strCopy << endl; //c風格字符串的復制 const char* constStr = "Hello C!"; char *pszCopy = new char[strlen(constStr) + 1]; strcpy(pszCopy, constStr); cout << pszCopy << endl; delete[] pszCopy; getchar(); return 0;}訪問字符串中的元素以及字符串的連接#include <iostream>#include <string>using namespace std;int main(){ string strStlString("hello Word"); cout << "使用傳統的方法顯示字符串中的每一個字符" << endl; for (size_t i = 0;i< strStlString.length(); ++i) { cout << strStlString[i] << endl; } cout << endl; cout << "使用STL里的迭代器操作字符串中的字符" << endl; string str1 = "ni hao"; string str2 = "this is fun!"; string::iterator i; for (i = strStlString.begin();i!=strStlString.end();++i) { cout << *i << endl; } //字符串的連接 str1 += str2; cout << str1 << endl; str1.append(str2); cout << str1 << endl; getchar(); return 0;}字符串的查找#include <iostream>#include <string>using namespace std;int main(){ string strSample = "Hello World! Today is a good day"; //字符串的查找 size_t positon = strSample.find("ll", 0); if (positon != string::npos) { cout << "找到了!" << endl; cout << positon << endl; } else { cout << "沒有找到哦" << endl; } //查找多個相同的子串 size_t position1 = strSample.find("day", 0); while (position1 != string::npos) { cout << "在下標" << position1 << "出找到子串day" << endl; size_t position2 = position1 + 1; position1 = strSample.find("day", position2); } //查找多個相同的字符 size_t position3 = strSample.find('o', 0); while (position3 != string::npos) { cout << "在下標" << position3 << "處找到o" << endl; size_t position4 = position3 + 1; position3 = strSample.find('o', position4); } getchar(); return 0;}字符串中元素的刪除及反轉#include <iostream>#include <string>#include <algorithm>int main(){ using namespace std; string strSample = "Hello String ! Wake up to a beautiful day"; cout << strSample << endl; strSample.erase(13, 28); cout << strSample << endl; //find算法,迭代器 string::iterator iChars = find(strSample.begin(), strSample.end(),'S'); if (iChars != strSample.end()) { strSample.erase(iChars); } cout << strSample << endl; strSample.erase(strSample.begin(), strSample.end()); if (strSample.length()==0) cout << "this is a empty string" << endl; //字符串反轉算法 string strSample2 = "Hello String! We will reverse you!"; cout << strSample2 << endl; reverse(strSample2.begin(), strSample2.end()); cout << strSample2 << endl; // cout << "請輸入一行字符串" << endl; string strInput; getline(cin, strInput); transform(strInput.begin(), strInput.end(),strInput.begin(),toupper);//從begin到end轉換，轉換后又存到以beign開始的地方 cout << strInput << endl; transform(strInput.begin(), strInput.end(), strInput.begin(), tolower); cout << strInput << endl; getchar(); return 0;}新聞熱點
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