程序代码：

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

HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);//获取标准输出句柄
int x, y;//定义坐标全局变量
//控制光标
void gotoxy(int x, int y)
{
    COORD coord;
    coord.X = x;
    coord.Y = y;
    SetConsoleCursorPosition(hConsole, coord);
}

//设置颜色
void settextcolor(int i)
{
    SetConsoleTextAttribute(hConsole, i);
}

//处理移动
void move(char key)
{
    switch (key)
    {
    case 72:
        if (y - 1 >= 0)//前面没有墙壁
        {
            --y;
            gotoxy(x, y);
            printf("■");
        }
        break;

    case 80:
        if (y + 1 < 48)//49和50行不作为游戏区
        {
            ++y;
            gotoxy(x, y);
            printf("■");
        }
        break;

    case 75:
        if (x - 2 >= 0)
        {
            x = x - 2;
            gotoxy(x, y);
            printf("■");
        }
        break;

    case 77:
        if (x + 2 < 50)
        {
            x = x + 2;
            gotoxy(x, y);
            printf("■");
        }
        break;

    default:
        break;
    }
}

//控制函数
void control()
{
    char key1 = 0, key2 = 0;
    while (key1 != 27)
    {
        key1 = getch();//接收键码
        key2 = 0;
        if (key1 <= 0)
            key2 = getch();//继续接收键码
        if (key2 == 72 || key2 == 75 || key2 == 77 || key2 == 80)//说明是方向键 
        {
            move(key2);
        }
    }
}

void main()
{
    srand((long)time(NULL));
    system("mode con: cols=50 lines=50");//可以在命令提示符中输入mode /?查询此用法
    system("title 小游戏");
    settextcolor(0xe);
    x = (rand() % 25) * 2, y = rand() % 48;
    gotoxy(x, y);
    printf("■");
    control();
}