How to declare a global variable that could be used in the entire program

Question

I have a variable that I would like to use in all my classes without needing to pass it to the class constructor every time I would like to use it. How would I accomplish th

Answer 1

if you want to declare it in different header files/cpp files, just declare it extern outside of other files

//file1.c
int x=1;
int f(){}
//file2.c
extern int x;