find函数可在已知字符串中查找子串
#include<iostream>
#include<string>
using namespace std;
int main()
{
string s1 = "Rey Dennis Steckler";
string s2 = "Dennis";
string s3 = "Ed Wood";
int f;
f = s1.find(s2);
if(f < s1.length())
cout<<"Found at index: "<<f<<endl;
else
cout<<"not found"<<endl;
f = s1.find(s3);
if(f < s1.length())
cout<<"Found at index: "<<endl;
else
cout<<"not found"<<endl;
string s4 = "bby";
string s5 = "bx";
cout<<s4.find_first_of(s5)<<endl;
cout<<s4.find_first_not_of(s5)<<endl;
return 0;
}