Check if a string contains a string in C++

Use std::string::find as follows:
if (s1.find(s2) != std::string::npos) {
std::cout << "found!" << 'n'; } Note: "found!" will be printed if s2 is a substring of s1, both s1 and s2 are of type std::string. You can try using the find function: string str ("There are two needles in this haystack."); string str2 ("needle"); if (str.find(str2) != string::npos) { //.. found. }