cout is not a member of std

I’m practicing using mulitple files and header files etc. So I have this project which takes two numbers and then adds them. Pretty simple. Here are my files: main.cpp #include <iostream> #include “add.h” int main() { int x = readNumber(); int y = readNumber(); writeAnswer(x + y); return(0); } io.cpp int readNumber() { int x; … Read more