随手

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

int key_to=1;
void set_key_pos(void *handle,int x,int y){
	COORD pos={y,x};
	SetConsoleCursorPosition(handle,pos);
}
int num1,num2;

int main(){
	HANDLE handle=GetStdHandle(STD_OUTPUT_HANDLE);
	CONSOLE_CURSOR_INFO curinfo;
	curinfo.dwSize=1;curinfo.bVisible=FALSE;
	SetConsoleCursorInfo(handle,&curinfo);
	
	SetConsoleTextAttribute(handle,0x07);
	set_key_pos(handle,0,0);
	printf("KEY_TO = 1");
	set_key_pos(handle,1,0);
	printf("KEY_PRESSED = ");
	
	SetConsoleTextAttribute(handle,0x07);
	set_key_pos(handle,5,10);printf("A");
	set_key_pos(handle,7,10);printf("B");
	set_key_pos(handle,9,10);printf("A+B");
	
	SetConsoleTextAttribute(handle,0xf0);
	set_key_pos(handle,5,20);printf("         0");
	set_key_pos(handle,7,20);printf("         0");
	set_key_pos(handle,9,20);printf("         0");
	
	SetConsoleTextAttribute(handle,0x07);
	set_key_pos(handle,5,30);printf("<-");
	
	for(;;){
		char c=_getch();
		set_key_pos(handle,1,14);
		SetConsoleTextAttribute(handle,0x07);
		printf("%d      ",c);
		
		if(c==72){ //向上键 
			key_to=1;
		}else if(c==80){ //向下键 
			key_to=2;
		}else if(c>='0' && c<='9'){ //数字键 
			if(key_to==1){
				num1=num1*10+c-'0';
			}else if(key_to==2){
				num2=num2*10+c-'0';
			}
		}else if(c==8){ //Backspace
			if(key_to==1){
				num1/=10;
			}else{
				num2/=10;
			}
		}else{
			//什么也不处理 
		}
		
		SetConsoleTextAttribute(handle,0x07);
		set_key_pos(handle,0,9);
		printf("%d  ",key_to);
		
		if(key_to==1){
			SetConsoleTextAttribute(handle,0x07);
			set_key_pos(handle,5,30);printf("<-");
			set_key_pos(handle,7,30);printf("  ");
		}
		if(key_to==2){
			SetConsoleTextAttribute(handle,0x07);
			set_key_pos(handle,7,30);printf("<-");
			set_key_pos(handle,5,30);printf("  ");
		}
		
		SetConsoleTextAttribute(handle,0xf0);
		set_key_pos(handle,5,20);printf("%10d",num1);
		set_key_pos(handle,7,20);printf("%10d",num2);
		set_key_pos(handle,9,20);printf("%10d",num1+num2); 
	}
	return 0;
	
}