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;unsi ...