进程 中的 int find_first_of(string&

str1.find_first_of(str);

#include<iostream>
using namespace std;
int main()
{
        string str1 = "Dancing is my favorite hobby";
        cout << "String contains :"<< str1<< '\n';
        cout <<"Position of the first occurrence of the string 'favorite' is " <<                      str1.find_first_of("favorite");
         return 0;         
}  

#include<iostream>
using namespace std;
int main()
{
string str = "Welcome to the programming world";
cout<< "String contains : "<< str <<'\n';
 cout<<"Now, start the search from the second position and we find the first occurrence of the 'programming' is :"<<str.find_first_of("programming",2);
return 0;
}

#include<iostream>
using namespace std;
int main()
{
string str = "learnfk tutorial";
cout << "String contains :" << str<< '\n';
cout <<"Position of the first occurrence of 'a' character is :" << str.find_first_of('a');
return 0;
}