C++ Method of detecting whether a key on a keyboard is pressed

The detection keyboard is similar to the mouse, but it is easier to remember

But it's kind of weird, like if you want to detect a letter, it has to be in uppercase

Specific reference to the virtual keyboard value table, baidu can be searched

I made up a little program to make it clear

#include<iostream>
#include<windows.h>
 
#define KEY_DOWN(VK_NONAME) ((GetAsyncKeyState(VK_NONAME) & 0x8000) ? 1:0) // It's necessary. I learned it by heart  
 
using namespace std;
 
void color(int a){// Change the color of the output than system("color x") Much faster 
	SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),a);
/*
<span style="white-space:pre">	</span> word  
	1	 Dark blue 
	2	 Dark green, 
	3	 Deep blue  
	4	 Deep red 
	5	 Deep pink 
	6	 yellow 
	7	 Deep white 
	8	 gray 
	9	 The light blue 
	10	 Light green  
	11	 Shallow blue  
	12	 Light red  
	13	 Pale pink  
	14	 Light yellow  
	15	 Light white  
	
	 background 
	1~15		 black  
	16~31		 Dark blue  
	32~47		 Dark green, 
	48~63		 Deep blue 
	64~79		 Deep red 
	80~95		 Deep pink 
	96~111		 Dark yellow 
	112~127 	 Deep white 
	128~143 	 gray 
	144~159 	 The light blue 
	160~175 	 Light green 
	176~191 	 Shallow blue 
	192~207 	 Light red 
	208~223 	 Pale pink 
	224~239 	 Light yellow 
	240~255 	 Light white 
*/
}
 
void check(char c){// Detect if a key is pressed, and press it to change the output color 
	if(!KEY_DOWN(c))color(7);
	else color(112);
	printf(" %c ",c);
	color(7);
}
 
int main(){
	while(1){
		check('Q');check('W');check('E');check('R');check('T');check('Y');check('U');check('I');check('O');check('P');
		printf("\n\n ");
		check('A');check('S');check('D');check('F');check('G');check('H');check('J');check('K');check('L');
		printf("\n\n ");
		check('Z');check('X');check('C');check('V');check('B');check('N');check('M');
		
		Sleep(20);// Loop time interval to prevent too much memory  
		system("cls");// Clear the screen  
	}
 
	return 0;
}