int main() {
    int counter = 0;
    __asm {
        call Subroutine_IncrementCounter; // counter = 1
        jmp EndMainProgram

      Subroutine_IncrementCounter:
        push ebx        ; // push content of ebx to stack
        mov ebx, counter
            inc ebx
            mov counter, ebx
            pop ebx     ; // pop content from stack to ebx
        ret
      EndMainProgram :
    }
}