c++ char* contains code example

Example 1: how to check string contains char in c++

std::string s = "Hello";
if (s.find('e') != std::string::npos)
    cout << "Found";
else
    cout << "Not Found";

Example 2: c++ contains

if (s1.find(s2) != std::string::npos) {
    std::cout << "found!" << '\n';
}