检查存储单元

[c]代码库

#include <stdio.h> 
#include <conio.h> 
#include <dos.h> 

int main(void) 
{ 
   int value = 0; 

   printf("The current status of your keyboard is:\n"); 
   value = peek(0x0040, 0x0017); 
   if (value & 1) 
      printf("Right shift on\n"); 
   else 
      printf("Right shift off\n"); 

   if (value & 2) 
      printf("Left shift on\n"); 
   else 
      printf("Left shift off\n"); 

   if (value & 4) 
      printf("Control key on\n"); 
   else 
      printf("Control key off\n"); 

   if (value & 8) 
      printf("Alt key on\n"); 
   else 
      printf("Alt key off\n"); 

   if (value & 16) 
      printf("Scroll lock on\n"); 
   else 
      printf("Scroll lock off\n"); 

   if (value & 32) 
      printf("Num lock on\n"); 
   else 
      printf("Num lock off\n"); 

   if (value & 64) 
      printf("Caps lock on\n"); 
   else 
      printf("Caps lock off\n"); 

   return 0; 
}