C++ STL之string常见用法

#include <iostream> #include <algorithm> #include <string> using namespace std; int main() { //可直接用cin输入，不可用scanf string s0; cin>>s0; cout<<s0<<endl; //可以用 = 讲数组中的值赋给string string s1; char s[1024]; cin>>s; s1=s; cout<<s1<<endl; //可以直接用 = 赋值 string s2; s2="hello"; cout<<s2<<endl; //string的拼接，+号 和append()方法皆可 s2+='-'; s2+="world"; s2.append("-2017"); cout<<s2<<endl; //向string中插入单个字符 s2.insert(s2.begin()+2,'x'); cout<<s2<<endl; //删除string中某一位置的字符 s2.erase(s2.begin()+2); //赋值为空串，相当于全部删除 s1=""; cout<<s1<<endl; cout<<s2<<endl; //string迭代器 string::iterator it; for(it = s2.begin();it!=s2.end();it++) { cout<<*it<<' '; } cout<<endl; //find()可用于寻找元素第一次出现的数组下标 cout<<s2.find('-')<<endl; cout<<s2.find("wor")<<endl; //逆置 reverse(s2.begin(),s2.end()); cout<<s2<<endl; //字典序排序 sort(s2.begin(),s2.end()); cout<<s2<<endl; //empty()判断是否为空 cout<<s2.empty()<<endl; //判断string是否相等 cout<<operator==(s2,s1)<<endl; //获得string子串 cout<<s2.substr(2,5); //size()计算string中有多少个字符 cout<<s2.size()<<endl; cout<<s2.length()<<endl; //at()输出某一确定位置的字符 cout<<s2.at(2); return 0; }