string構造函數
代碼如下:

#include <iostream> #include <string> using namespace std;void test01() {string s1;cout << "s1 = " << s1 << endl;const char *str = "hello world";string s2(str);cout << "s2 = " << s2 << endl;string s3(s2);cout << "s3 = " << s3 << endl;string s4(10, 'a');cout << "s4 = " << s4 << endl;}int main() {test01();return 0; }

測試結果:

總結:
string的多種構造方式沒有可比性，靈活使用即可。

代碼如下:

#include <iostream> #include <string> using namespace std;void test01() {string str1;str1 = "hello world";cout << "str1 = " << str1 << endl;string str2;str2 = str1;cout << str2 << endl;string str3;str3 = 'a';cout << "str3 = " << str3 << endl;string str4;str4.assign("hello c++");cout << "str4 = " << str4 << endl;string str5;str5.assign("hello c++", 5);cout << "str5 = " << str5 << endl;string str6;str6.assign(str5);cout << "str6 = " << str6 << endl;}int main() {test01();return 0; }

測試結果:

總結:
string的賦值方式很多，operator= 這種方式是比較實用的。

代碼如下:

#include <iostream> #include <string> using namespace std;void test01() {string str1 = "我";str1 += "愛玩游戲";cout << "str1 = " << str1 << endl;str1 += ":";cout << "str1 = " << str1 << endl;string str2 = "LoL DNF";str1 += str2;cout << "str1 = " << str1 << endl;string str3 = "I";str3.append("Love");//str3.append(str2);str3.append("game abcde", 4);str3.append(str2, 4, 3);//從下標4位置開始，截取3個字符，拼接到字符串末尾cout << "str3 = " << str3 << endl;}int main() {test01();return 0; }

測試結果:

代碼如下:

#include <iostream> #include <string> using namespace std;void test01() {//查找string str1 = "abcdefgde";int pos = str1.find("de");if (pos == -1){cout << "no find" << endl;}else cout << "pos = " << pos << endl;pos = str1.rfind("de");cout << "pos = " << pos << endl;}void test02() {//替換string str1 = "abcdefgde";str1.replace(1, 3, "1111");cout << "str1 = " << str1 << endl; }int main() {test01();cout << "-----------------------------------"<<endl;test02();return 0; }

測試結果:

總結:

代碼如下:

#include <iostream> #include <string> using namespace std;void test01() {string s1 = "hello";string s2 = "aello";int ret = s1.compare(s2);if (ret == 0){cout << "s1 = s2" << endl;}else if (ret > 0){cout << "s1 > s2" << endl;}else{cout << "s1 < s2" << endl;}}int main() {test01();return 0; }

測試結果:

總結：
字符串對比主要是用于比較兩個字符串是否相等，判斷誰大誰小的意義并不是很大。

代碼如下:

#include <iostream> #include <string> using namespace std;void test01() {string str = "hello world";for (int i = 0; i < str.size(); i++){cout << str[i] << " ";}cout << endl;for (int i = 0; i < str.size(); i++){cout << str.at(i) << " ";}cout << endl;//字符修改str[0] = 'x';str.at(1) = 'x';cout << str << endl;}int main() {test01();return 0; }

測試結果:

總結:
string字符串中單個字符存取有兩種方式，利用[]或at

代碼如下：

#include <iostream> #include <string> using namespace std;void test01() {string str = "hello";str.insert(1, "111");cout << str << endl;str.erase(1, 3);cout << str << endl;}int main() {test01();return 0; }

測試結果：

總結:
插入和刪除的起始下標都是從0開始

代碼如下:

#include <iostream> #include <string> using namespace std;void test01() {string str = "abcdefg";string subStr = str.substr(1, 3);cout << "subStr = " << subStr << endl;string email = "hello@sina.com";int pos = email.find("@");string username = email.substr(0, pos);cout << "username = " << username << endl; }int main() {test01();return 0; }

測試結果:

總結

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