C语言小游戏---命令行弹跳小球

学习B站 https://www.bilibili.com/video/av34118200?p=17

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

int high, width;//windows
int ball_x, ball_y; // ball position
int ball_vx, ball_vy; // ball speed
int position_x, position_y; //center of board
int radius; //radius of board
int left, right; // boundary of board
int ball_number;  //score

void HideCursor() { // if cursor
    CONSOLE_CURSOR_INFO cursor_info= {1,0}; //second value is 0 mean hide cursor
    SetConsoleCursorInfo(GetStdHandle(STD_OUTPUT_HANDLE),&cursor_info);
}

void gotoxy(int x, int y) { // move mouse to x,y position, similer clear screen
    HANDLE handle = GetStdHandle(STD_OUTPUT_HANDLE);
    COORD pos;
    pos.X = x;
    pos.Y = y;
    SetConsoleCursorPosition(handle, pos);
}

void startup() { // init data

    high = 18;
    width = 25;

    ball_x = 1;
    ball_y = width / 2;

    ball_vx = 1;
    ball_vy = 1;

    position_x = high-1;
    position_y = width/2;
    radius = 5;
    left = position_y-radius;
    right = position_y+radius;

    ball_number = 0;

    HideCursor();
}

void show() { // show windows
    gotoxy(0,0);  //move mouse to 0,0 origin point, and redraw screen
    int i, j;

//    system("cls"); //clear screen

    for(i=0; i<=high; i++) {
        for(j=0; j<=width; j++) {
            if(i==ball_x && j==ball_y)
                printf("o");  //show ball *
            else if(i==high)
                printf("-");
            else if(j==width)
                printf("|");
            else if((i==position_x)&&(j>=left)&&(j<=right))
                printf("*");
            else
                printf(" ");  //show nothing
        }
        printf("
");

    }
    printf("ball_number:%d",ball_number);
}

void updateWithoutInput() {
    if(ball_x==position_x) {
        if((ball_y>=left)&&(ball_y<=right)) {
            ball_number++;
            ball_vy = -ball_vy;
        } else
            exit(0);
    }
    //update ball's position
    ball_x = ball_x + ball_vx;
    ball_y = ball_y + ball_vy;

    //meet boundard
    if(ball_x==0 || ball_x==high-1)
        ball_vx = -ball_vx;
    if(ball_y==0 || ball_y==width-1)
        ball_vy = -ball_vy;


//    Sleep(50);
}

void updateWithInput() {
    char input;
    if(kbhit()) { //runing while user push keyboard
        input = getch();
        if(input == 'a') {
            position_y--; //move left
            left = position_y-radius;
            right = position_y+radius;
        }
        if(input == 'd') {
            position_y++; //move right
            left = position_y-radius;
            right = position_y+radius;
        }

    }
}
int main() {
    startup(); // init data
    while(1) { // game loop run
        show(); // show windows
        updateWithoutInput(); //update don't need user
        updateWithInput(); //update need user
    }
    return 0;
}