قسمتی از کد برنامه :
void checkfile();
void DrawCalc();
void Init();
void checkerrors(void);
char MouseInit(void);
void MouseShow(void);
void MouseHide(void);
int MousePoll(void);
void GrKey(char Number, int x1,int y1,int x2,int y2,char Title[], int Press);
void MouseKeyPressed(char Number);
void KeyPressed(char Number);
int KeyControl(void);
void ButtonInit(void);
void calc(void);
char getkey(void);
void error(void);
void Print(char title[]);
double getnum(void);
void help();
struct {
char *Title;
unsigned char Use;
int x1, y1, x2, y2;
char BackColor, ForeColor;
} Button[MAXBUTTON];
int MouseKey=0, MouseRow, MouseCol;
char Key;
double d=0;
char *NUMBER;
double memory = 0;
char BEVELWIDTH = 7;
ماشین حساب گرافیکی ++c