string的字符串进行比较，代码见下。
#include<iostream>using namespace std;int main() {// 1 comparestring s1 = "aab";string t11 = "aab";int r11 = s1.compare(t11);cout << "1: " << r11 << endl;string t12 = "aaa";int r12 = s1.compare(t12);cout << "2: " << r12 << endl;string t13 = "aac";int r13 = s1.compare(t13);cout << "3: " << r13 << endl;string t14 = "aaba";int r14 = s1.compare(t14);cout << "4: " << r14 << endl;string t15 = "aa";int r15 = s1.compare(t15);cout << "5: " << r15 << endl;// 2 > < = >= <=cout << "new 1: " << (s1 == t11) << endl;cout << "new 2: " << (s1 != t11) << endl;}string随机访问，代码见下
#include<iostream>using namespace std;int main() {// 1 访问string s = "I love xiaoxiaoxiao";cout << s << endl;for (int i = 0; i < s.size(); ++i) {cout << s[i] << " ";}cout << endl;for (int i = 0; i < s.size(); ++i) {cout << s.at(i) << " "; // 这两个区别看前面}cout << endl;// 2 修改s[11] = '5';s[12] = '2';s.at(13) = '0';s.at(14) = ' ';cout << s << endl;return 0;}string数据删除，代码见下：
#include<iostream>using namespace std;int main() {string s1 = "Heworld";s1.insert(2, 2, 'l');cout << s1 << endl;s1.insert(4, "o ");s1.insert(s1.size(), "xiaoxiao");cout << s1 << endl;s1.insert(s1.begin(), ';');// 插入迭代器的话，只能是单个字符cout << s1 << endl;return 0;}
