c++ string contains
#include <iostream>
#include <string>
int main() {
std::string mainString = "Hello, World!";
std::string subString = "World";
if (mainString.find(subString) != std::string::npos) {
std::cout << "Substring found in the main string." << std::endl;
} else {
std::cout << "Substring not found in the main string." << std::endl;
}
return 0;
}