判断测一个变量的值,当变量等于1时向串口发送字符串“vacant”
时间: 2023-11-27 11:49:22 浏览: 85
在C语言中,可以使用如下代码判断变量是否等于1,并向串口发送字符串:
```c
if (variable == 1) {
printf("vacant");
}
```
其中,`variable`代表需要判断的变量名称,`printf`函数用于向串口发送字符串。请注意,在使用此代码之前,需要先初始化串口。
相关问题
vacant 和vecuum 区别
Vacant和Vacuum是两个不同的单词,它们的意义和用法也不同。
Vacant的意思是“空闲的”,通常用来描述某个位置或者房间没有被占用,没有人或者物品在其中。例如:The seat next to me is vacant.(我旁边的座位是空的。)
Vacuum的意思是“真空”,通常用来描述没有空气或其他物质的空间。例如:The vacuum cleaner sucks up dust and dirt from the carpet.(吸尘器从地毯上吸起尘土。)
总的来说,Vacant侧重于描述空闲和空着的状态,而Vacuum则侧重于描述没有物质存在的状态。
用html,css和js写一个俄罗斯方块游戏
很高兴帮助你写一个俄罗斯方块游戏!在这里提供一个基本的 HTML、CSS 和 JavaScript 代码模板,供你参考和修改:
HTML:
```
<!DOCTYPE html>
<html>
<head>
<title>Tetris</title>
<meta charset="utf-8">
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<canvas id="canvas"></canvas>
<script src="script.js"></script>
</body>
</html>
```
CSS:
```
canvas {
border: 1px solid black;
}
```
JavaScript:
```
const canvas = document.getElementById("canvas");
const context = canvas.getContext("2d");
const ROW = 20;
const COL = 10;
const SQ = 30;
const VACANT = "white";
// draw a square
function drawSquare(x, y, color) {
context.fillStyle = color;
context.fillRect(x * SQ, y * SQ, SQ, SQ);
context.strokeStyle = "black";
context.strokeRect(x * SQ, y * SQ, SQ, SQ);
}
// create the board
let board = [];
for (r = 0; r < ROW; r++) {
board[r] = [];
for (c = 0; c < COL; c++) {
board[r][c] = VACANT;
}
}
// draw the board
function drawBoard() {
for (r = 0; r < ROW; r++) {
for (c = 0; c < COL; c++) {
drawSquare(c, r, board[r][c]);
}
}
}
drawBoard();
// the pieces and their colors
const PIECES = [
[Z, "red"],
[S, "green"],
[T, "purple"],
[O, "yellow"],
[L, "orange"],
[I, "cyan"],
[J, "blue"]
];
// generate random pieces
function randomPiece() {
let r = Math.floor(Math.random() * PIECES.length);
return new Piece(PIECES[r][0], PIECES[r][1]);
}
let p = randomPiece();
// the Object Piece
function Piece(tetromino, color) {
this.tetromino = tetromino;
this.color = color;
this.tetrominoN = 0;
this.activeTetromino = this.tetromino[this.tetrominoN];
// position of the piece
this.x = 3;
this.y = -2;
}
// fill function
Piece.prototype.fill = function (color) {
for (r = 0; r < this.activeTetromino.length; r++) {
for (c = 0; c < this.activeTetromino.length; c++) {
if (this.activeTetromino[r][c]) {
drawSquare(this.x + c, this.y + r, color);
}
}
}
};
// draw a piece to the board
Piece.prototype.draw = function () {
this.fill(this.color);
};
// undraw a piece
Piece.prototype.unDraw = function () {
this.fill(VACANT);
};
// move down the piece
Piece.prototype.moveDown = function () {
if (!this.collision(0, 1, this.activeTetromino)) {
this.unDraw();
this.y++;
this.draw();
} else {
// lock the piece and
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