结合使用kbhit()和while循环 [英] Use of kbhit() with while loop

问题描述

这是程序.

void main( )
{
    int h, v;
    h = 1; v = 10;
    while ( !kbhit( ) || h <= 80 )
    {
        gotoxy( h, v );
        printf( "<--->" );
        delay( 200 );
        clrscr( );
        h = h + 1;
    }
    getch( );
}

我正在用C编写一个程序，在其中使用kbhit()来运行循环，直到按下某个键为止. 因此，箭头"<--->"将一直向前移动，直到按下某个键或到达屏幕的最后一个像素为止.

I am making a program in C, in which I have used kbhit() to run a loop until a key is pressed. so here the arrow "<--->" will keep on moving forward until a key is pressed or until it reaches the last pixel of the screen.

我想要的是程序每次按'd'时应将h递增1，而每次按'a'时应递减1.即h++;和h--; 并运行另一个循环，直到按下一个字符为止. 这个想法更像是Snake游戏，在该游戏中，蛇一直沿特定方向移动，直到按下键为止.请帮忙！

What I want is that the program should increment h by 1 everytime 'd' is pressed and decrement by 1 everytime 'a' is pressed. i.e h++; and h--; and run another loop until a character is pressed. The idea is more like the Snake game, in which the snake keeps on moving in a certain direction until a key is pressed. Help please!

推荐答案

clrscr()应该在gotoxy和printf之前

clrscr() should come before the gotoxy and printf

无论如何，我要做的是创建一个状态变量，只是为了指示蛇应该走的方向，即，如果用户按下"a"或"d"，则存储的东西.

Anyway, what I would do is create a state variable, just to indicate the direction the snake should go, i.e., something that stores if the user pressed 'a' or 'd'.

我不会离开循环，只需使用if(kbhit)并获取char.

And I would not leave the loop, just use a if(kbhit) and get the char.

int direction = 1; char control;
while (1)
{
    if(kbhit()){
       control = getch();
       switch (control){
              case 'a': direction = -1; break;
              case 'd': direction = +1; break;
              default: break;
       }
    }
    clrscr( );
    gotoxy( h, v );
    printf( "<--->" );
    delay( 200 );
    h = h + direction;
}

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