What is an ‘undeclared identifier’ error and how do I fix it?
They most often come from forgetting to include the header file that contains the function declaration, for example, this program will give an ‘undeclared identifier’ error: Missing header int main() { std::cout << “Hello world!” << std::endl; return 0; } To fix it, we must include the header: #include <iostream> int main() { std::cout << … Read more