在Turbo C下运行的计算器

#include<dos.h>
#include<math.h>
#include<conio.h>
#include<stdio.h>
#include<stdlib.h>
#include<stdarg.h>
#include<graphics.h>
#include<string.h>
#include<ctype.h>
#define UP 0x48
#define DOWN 0x50
#define LEFT 0x4b
#define RIGHT 0x4d
#define ENTER 0x0d
void *rar;
struct palettetype palette;
int GraphDriver;
int GraphMode;
int ErrorCode;
int MaxColors;
int MaxX,MaxY;
double AspectRatio;
void drawboder(void);
void initialize(void);
void computer(void);
void changtextstyle(int font,int direction,int charsize);
void mwindow(char *header);
int specialkey(void);
int arrow();

int main()
{ initialize();
computer();
closegraph();
return(0);
}


void initialize(void)
{int  xasp,yasp;
GraphDriver=DETECT;
initgraph(&GraphDriver,&GraphMode,"");
ErrorCode=graphresult();
if(ErrorCode!=grOk)
{printf("Graphics System Error:%s",grapherrormsg(ErrorCode));
exit(1);
}
getpalette(&palette);
MaxColors=getmaxcolor()+1;
MaxX=getmaxx();
MaxY=getmaxy();
getaspectratio(&xasp,&yasp);
AspectRatio=(double)xasp/(double)yasp;
}


void computer(void)
{
struct viewporttype vp;