小编tec*_*k23的帖子

当左键单击鼠标时,应该交换彼此水平相邻的颜色,当右键单击时,垂直相邻的颜色应该交换.单击任一按钮时都没有发生任何事情.

有问题的代码:

import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JPanel;

import sun.java2d.loops.DrawRect;

import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;

public class Board extends JPanel implements MouseListener
{
//instance variables
private int width;
private int height;
private Block topLeft;
private Block topRight;
private Block botLeft;
private Block botRight;

public Board()  //constructor
{
    width = 200;
    height = 200;
    topLeft=new Block(0,0,width/2-10,height/2-10,Color.RED);
    topRight=new Block(width/2,0,width/2-10,height/2-10,Color.GREEN);
    botLeft=new Block(0,height/2,width/2-10,height/2-10,Color.BLUE);
    botRight=new Block(width/2,height/2,width/2-10,height/2-10,Color.YELLOW);
    setBackground(Color.WHITE);
    setVisible(true);
    //start trapping for mouse clicks
    addMouseListener(this);
}

//initialization constructor
 public Board(int w, int h)  //constructor
 {
    width = …

我在德克萨斯理工大学的编程课上,在上学期学习Python之后,我终于进入了C++课程.当我们今天在课堂上制作一个HelloWorld程序时,我和其他一些人得到了Microsoft Visual Studio 2013告诉我们使用scanf_s而不是scanf,就像教师在他的程序中使用的一样.下面是我的代码.

#include <stdio.h>
int main(){

int i,j;
float x,y;
scanf("input a number: %d %d %f %f", &i, &j, &x, &y);

printf("print numbers a : %d \n",i);
printf("print numbers a : %10.3d \n", i);
printf("print numbers a : %-10.3d", i);

fflush(stdin);
getchar();
return 0;
}