C++ string初始化、string赋值操作、string拼接操作

以下介绍了string的六种定义方式，还有很多，这个只是简单举例

#include<iostream>using namespace std;int main() {//1 无参构造string s1;cout << s1 << endl;//2 初始化构造string s2 ({'h', 'h', 'l', 'l', 'o'});cout << s2 << endl;//3 字符串初始化string s3("xiaoxiao");cout << s3 << endl;//4 字符串的前n个字符string s4("xiaoxiaoxiao", 6);cout << s4 << endl;//5 拷贝构造string s5(s4);cout << s5 << endl;// a 个 bstring s6(8, 'o');cout << s6 << endl;return 0;}

以下是string的六种赋值操作，以下是代码

#include<iostream>
using namespace std;int main() {//1 字符串常量的赋值string s1;s1 = "xiaoxiao";cout << s1 << endl;//2 字符串变量的赋值string s2;s2 = s1;cout << s2 << endl;//3 字符常量赋值string s3;s3 = 'a';cout << s3 << endl;//4 assign 接口1string s4;s4.assign("xiaoxiao");cout << s4 << endl;//5 assign 接口2string s5;s5.assign("xiaoxiaoxiao", 8);cout << s5 << endl;//6 assign 接口3string s6;s6.assign(s5);cout << s6 << endl;//7 a个bstring s7;s7.assign(8, '6');cout << s7 << endl;}

string拼接操作，代码见下

#include<iostream>using namespace std;int main() {// 1 + 运算符重载string s1 = "dada";string s2 = "xiao";s1 = s1 + s2;cout << s1 << endl;// 2 += 运算符重载string s3 = "dada";string s4 = "xiao";s4 += "daxiao";cout << s4 << endl;// 3 appendstring s5 = "abc";s5.append("def");s5.append("hijklmn", 4); // 取这个的前四个，进行对应字符串的拼接，这个4代表个数s5.append("opqrst", 2, 3);// 取从第二个开始，取三个进行拼接cout << s5 << endl;// 4 push_backstring s6 = "abb";s6.push_back('6');cout << s6 << endl;return 0;
}