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;
}