When compiling more than one file at once, do you have to put the include statements in all the files that need them, or just the main?
Ex. Can you do this:

File 1:
class A {
public:
int a;
A() {
a = sqrt(2835);
}
};

File 2:
class B {
public:
int b;
B() {
b = pow(2416, 4)
}
};

File 3:
#include <iostream>
#include <cmath>
using namespace std;

int main() {
A a;
B b;
cout << a.a;
cout << b.b;
}


Or would each file have to include <cmath> ?
Thanks..

It depends.

Are File 1 and File 2 header files or code files? If they are the actual code (.cpp) files, then they would each need to have the include statement. If they were header files, then the include would only need to be in main, but before your own includes.