C语言中如何实现选项菜单的功能？

答案：
#include <process.h> 
#include <dos.h> 
#include <conio.h> 
#define Key_DOWN   0x5100 
#define Key_UP     0x4900 
#define Key_ESC     0x011b 
#define Key_ALT_F 0x2100 
#define Key_ALT_X 0x2d00 
#define Key_ENTER   0x1c0d 
 
void box(int startx,int starty,int high,int width); 
 
main() 
{ 
  int i,key,x,y,l; 
  char *menu[] = {"File","Edit","Run","Option","Help","Setup","Zoom","Menu"}; 
  char *red[] = { "F","E","R","O","H","S","Z","M" };  
  char *f[] = {"Load file", "Save file", "Print", "Modify ",  "Quit  A1t_x"}; 
  char buf[16*10*2],buf1[16*2];
  while(1) 
  { 
 textbackground(BLUE); 
 clrscr(); 
 textmode(C80); 
 window(1,1,80,1);
 textbackground(LIGHTGRAY); 
 textcolor(BLACK); 
 clrscr(); 
 gotoxy(5,1);
for(i=0,l=0;i<8;i++) 
   { 
  x=wherex();    
  y=wherey(); 
  cprintf("%s",menu[i]);  
  l=strlen(menu[i]);  
  gotoxy(x,y); 
  textcolor(RED); 
  cprintf("%s",red[i]);  
  x=x+l+5; 
  gotoxy(x,y); 
  textcolor(BLACK);   
 } 
 gotoxy(5,1); 
key=bioskey(0);    
 switch (key){ 
  case Key_ALT_X: 
  exit(0); 
  case Key_ALT_F: 
  { 
   textbackground(BLACK); 
   textcolor(WHITE); 
   gotoxy(5,1); 
   cprintf("%s",menu[0]); 
   gettext(5,2,20,12,buf); 
   window(5,2,20,9);
   textbackground(LIGHTGRAY); 
   textcolor(BLACK); 
   clrscr(); 
   box(1,1,7,16);   
   for(i=2;i<7;i++)  
   { gotoxy(2,i); 
     cprintf("%s",f[i-2]); 
   } 
   gettext(2,2,18,3,buf1);  
   textbackground(BLACK); 
   textcolor(WHITE); 
   gotoxy(2,2); 
   cprintf("%s",f[0]);
   gotoxy(2,2); 
   y=2; 
 
   while ((key=bioskey(0))!=Key_ALT_X)   
   { 
      if ((key==Key_UP)||(key==Key_DOWN)) 
   { 
    puttext(2,y,18,y+1,buf1);   
    if (key==Key_UP) 
     y=y==2?6:y-1; 
    else 
     y=y==6?2:y+1; 
    gettext(2,y,18,y+1,buf1);
    textbackground(BLACK); 
    textcolor(WHITE); 
    gotoxy(2,y); 
    cprintf("%s",f[y-2]);
    gotoxy(2,y); 
    } 
   else 
    if (key==Key_ENTER)
    { 
      switch ( y-1 ){ 
         case 1:  
        break; 
         case 2:    
        break; 
         case 3:  
        break; 
           case 4: 
        break; 
         case 5: 
        exit(0); 
         default: 
        break; 
     } 
     break; 
    } 
    else 
     if (key==Key_ESC) 
      break; 
   } 
   if (key==Key_ALT_X) exit(0); 
   break; 
  }
 } 
  } 
  } 
 
void box(int startx,int starty,int high,int width) 
{ int i; 
 gotoxy(startx,starty); 
 putch(0xda);       
 for (i=startx+1;i<width;i++) putch(0xc4); 
 putch(0xbf);      
 for( i=starty+1;i<high;i++) 
 { 
  gotoxy(startx,i);putch(0xb3);   
  gotoxy(width,i);putch(0xb3);  
 } 
 gotoxy(startx,high); 
putch(0xc0);       
 for (i=startx+1;i<width;i++) putch(0xc4);  
 putch(0xd9);        
 return ; 
}
用if语句。
1。需要一个清屏函数，这个单词我记不太清了可能是（setm("cty").
2.需要一个break函数;
system("pause");
在#include<stdlib.h>里面声明。

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