Using g++ in Linux mint causing undefined reference to 'Class::Function' (collect2: error)

Question

Also stoi and exit(0) are both out of scope in stk.cpp and I don\'t know why.

Here is main.cpp

#include \"stk.h\"

int main()
{
    cout << \"R         


        

Answer 1

The problem is that you are not linking the code from stk.cpp when creating the executable.

Solution 1: Compile the .cpp files first and then link.

g++ -c main.cpp
g++ -c stk.cpp
g++ main.o stk.o -o test

Solution 2: Compile and link both files in one step.

g++ main.cpp stk.cpp -o test