DEFN 0 4;
//defn1 is main()
//frame = stack

PUSH 1;		//frame[0] = 1;			//int x = 1
PUSH 0;		//frame[1] = 0;			//create parameter
ASSIGN 0 1;	//frame[1] = frame[0];		//set parameter = x
PUSH 3;		//frame[2] = 3;			//ret = defn3
PUSH 2;		//frame[3] = 2;			//prepare jump to defn2
JUMP 3;		//defn2();			//addtwo( x );


DEFN 3 2;
//defn2 is addtwo( int n )
//frame[0] = n
//frame[1] = return defn
//frame[2] = this defn id

POP;		//del frame[2];			//discard our defn id
PUSH 2;		//frame[2] = 2;			//int a = 2
ADD 0 2;	//frame[3] = frame[0] + frame[2];//int b = n + a
ASSIGN 3 0;	//frame[0] = frame[3];		//n = b
POP;		//del frame[3];			//del b
POP;		//del frame[2];			//del a
JUMP 1;		//defn3();			//return n


DEFN 3 0;
//defn3 is main() continued
//frame[0] = x
//frame[1] = n
//frame[2] = this defn id

POP;		//del frame[2];			//discard our defn id
ASSIGN 1 0;	//frame[0] = frame[1];		//x = n
POP;		//del frame[1];			//del n
POP;		//del frame[0];			//del x
HALT;		//program finish

//attach binary file to program
DATA "test.bin";