prepare (1/3): 
finished

make (2/3): 
g++ -g -Wall -O2 -o main.o -c main.cpp
g++ -g -Wall -O2 -o dayfunction.o -c dayfunction.cpp
g++ -g -Wall -O2 -o equity.o -c equity.cpp
g++ -g -Wall -O2 -o line.o -c line.cpp
line.cpp: In constructor 'line::line()':
line.cpp:7:10: warning: converting to non-pointer type 'int' from NULL [-Wconversion-null]
  IDNUM = NULL;
          ^~~~
line.cpp:8:14: warning: converting to non-pointer type 'int' from NULL [-Wconversion-null]
  TIMESTAMP = NULL;
              ^~~~
line.cpp:12:10: warning: converting to non-pointer type 'int' from NULL [-Wconversion-null]
  PRICE = NULL;
          ^~~~
line.cpp:13:13: warning: converting to non-pointer type 'int' from NULL [-Wconversion-null]
  QUANTITY = NULL;
             ^~~~
line.cpp:14:16: warning: converting to non-pointer type 'int' from NULL [-Wconversion-null]
  EXPIRE_TIME = NULL;
                ^~~~
g++ -g -Wall -O2 -o ttt.o -c ttt.cpp
g++ -g -Wall -O2 -o main main.o dayfunction.o equity.o line.o ttt.o
finished

clean (3/3): 
finished

all task finished, build successfully