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Xingyu.Wang
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[#]: subject: "Write a guessing game in ncurses on Linux"
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[#]: via: "https://opensource.com/article/21/8/guess-number-game-ncurses-linux"
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[#]: author: "Jim Hall https://opensource.com/users/jim-hall"
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[#]: collector: "lujun9972"
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[#]: translator: "perfiffer"
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[#]: reviewer: " "
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[#]: publisher: " "
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[#]: url: " "
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Write a guessing game in ncurses on Linux
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======
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Use the flexibility and power of ncurses to create a guess-the-number
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game on Linux.
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![question mark in chalk][1]
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In my [last article][2], I gave a brief introduction to using the **ncurses** library to write text-mode interactive applications in C. With **ncurses**, we can control where and how text gets displayed on the terminal. If you explore the **ncurses** library functions by reading the manual pages, you’ll find there are a ton of different ways to display text, including bold text, colors, blinking text, windows, borders, graphic characters, and other features to make your application stand out.
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If you’d like to explore a more advanced program that demonstrates a few of these interesting features, here’s a simple “guess the number” game, updated to use **ncurses**. The program picks a random number in a range, then asks the user to make repeated guesses until they find the secret number. As the user makes their guess, the program lets them know if the guess was too low or too high.
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Note that this program limits the possible numbers from 0 to 7. Keeping the values to a limited range of single-digit numbers makes it easier to use **getch()** to read a single number from the user. I also used the **getrandom** kernel system call to generate random bits, masked with the number 7 to pick a random number from 0 (binary 0000) to 7 (binary 0111).
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```
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#include <curses.h>
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#include <string.h> /* for strlen */
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#include <sys/random.h> /* for getrandom */
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int
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random0_7()
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{
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int num;
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getrandom(&num, sizeof(int), GRND_NONBLOCK);
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return (num & 7); /* from 0000 to 0111 */
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}
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int
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read_guess()
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{
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int ch;
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do {
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ch = getch();
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} while ((ch < '0') || (ch > '7'));
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return (ch - '0'); /* turn into a number */
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}
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```
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By using **ncurses**, we can add some visual interest. Let’s add functions to display important text at the top of the screen and a message line to display status information at the bottom of the screen.
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```
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void
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print_header(const char *text)
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{
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move(0, 0);
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clrtoeol();
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attron(A_BOLD);
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mvaddstr(0, (COLS / 2) - (strlen(text) / 2), text);
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attroff(A_BOLD);
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refresh();
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}
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void
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print_status(const char *text)
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{
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move(LINES - 1, 0);
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clrtoeol();
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attron(A_REVERSE);
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mvaddstr(LINES - 1, 0, text);
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attroff(A_REVERSE);
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refresh();
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}
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```
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With these functions, we can construct the main part of our number-guessing game. First, the program sets up the terminal for **ncurses**, then picks a random number from 0 to 7. After displaying a number scale, the program then enters a loop to ask the user for their guess.
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As the user makes their guess, the program provides visual feedback. If the guess is too low, the program prints a left square bracket under the number on the screen. If the guess is too high, the game prints a right square bracket. This helps the user to narrow their choice until they guess the correct number.
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```
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int
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main()
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{
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int number, guess;
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initscr();
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cbreak();
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noecho();
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number = random0_7();
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mvprintw(1, COLS - 1, "%d", number); /* debugging */
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print_header("Guess the number 0-7");
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mvaddstr(9, (COLS / 2) - 7, "0 1 2 3 4 5 6 7");
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print_status("Make a guess...");
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do {
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guess = read_guess();
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move(10, (COLS / 2) - 7 + (guess * 2));
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if (guess < number) {
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addch('[');
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print_status("Too low");
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}
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else if (guess > number) {
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addch(']');
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print_status("Too high");
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}
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else {
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addch('^');
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}
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} while (guess != number);
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print_header("That's right!");
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print_status("Press any key to quit");
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getch();
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endwin();
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return 0;
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}
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```
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Copy this program and compile it for yourself to try it out. Don’t forget that you need to tell GCC to link with the **ncurses** library:
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```
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`$ gcc -o guess guess.c -lncurses`
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```
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I’ve left the debugging line in there, so you can see the secret number near the upper-right corner of the screen:
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![guess number game interface][3]
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Figure 1: Guess the number game. Notice the secret number in the upper right.
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### Get yourself going with ncurses
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This program uses a bunch of other features of **ncurses** that you can use as a starting point. For example, the print_header function prints a message in bold text centered at the top of the screen, and the print_status function prints a message in reverse text at the bottom-left of the screen. Use this to help you get started with **ncurses** programming.
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--------------------------------------------------------------------------------
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via: https://opensource.com/article/21/8/guess-number-game-ncurses-linux
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作者：[Jim Hall][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://opensource.com/users/jim-hall
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[b]: https://github.com/lujun9972
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[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/question-mark_chalkboard.jpg?itok=DaG4tje9 (question mark in chalk)
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[2]: https://opensource.com/article/21/8/ncurses-linux
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[3]: https://opensource.com/sites/default/files/guessnumber07.png
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@ -0,0 +1,158 @@
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[#]: subject: "Write a guessing game in ncurses on Linux"
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[#]: via: "https://opensource.com/article/21/8/guess-number-game-ncurses-linux"
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[#]: author: "Jim Hall https://opensource.com/users/jim-hall"
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[#]: collector: "lujun9972"
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[#]: translator: "perfiffer"
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[#]: reviewer: " "
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[#]: publisher: " "
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[#]: url: " "
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通过 ncurses 在 Linux 上写一个猜谜游戏
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======
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使用 ncurses 的灵活性和强大功能在 Linux 上创建一个猜数字游戏。
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![question mark in chalk][1]
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在我的[上一篇文章][2]，我简要介绍了使用 ncurses 库通过 C 语言编写文本模式交互式应用程序。使用 `ncurses`，我们可以控制文本在终端上的显示位置和方式。如果你通过阅读手册页探索 `ncurses` 库函数，你会发现有很多不同的方式来显示文本，包括粗体文本、颜色、闪烁文本、窗口、边框、图形字符和其它功能，这些都可以使你的应用脱颖而出。
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如果你想探索一个更高级的程序来演示其中一些有趣的功能，这里有一个简单的“猜数字”游戏，已更新为使用 `ncurses`。该程序在一个范围内选择一个随机数，然后要求用户进行重复猜测，直到他们猜到秘密数字。当用户进行猜测时，程序会告知他们猜测的数字是太低还是太高。
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请注意，程序限定可能的数字范围是 0 到 7。将值保持在有限的个位数数字范围内，可以更轻松的使用 `getch()` 函数从用户读取单个数字。我还使用了 `getrandom` 内核系统调用来生成随机数，设定数字最大值为 7，以从 0 （二进制 0000）到 7 （二进制0111）中选择一个随机数。
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```
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#include <curses.h>;
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#include <string.h>; /* for strlen */
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#include <sys/random.h>; /* for getrandom */
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int
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random0_7()
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{
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int num;
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getrandom(&num, sizeof(int), GRND_NONBLOCK);
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return (num & 7); /* from 0000 to 0111 */
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}
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int
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read_guess()
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{
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int ch;
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do {
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ch = getch();
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} while ((ch < '0') || (ch > '7'));
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return (ch - '0'); /* turn into a number */
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}
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```
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通过使用 `ncurses`，我们可以增加一些有趣的视觉体验。通过添加函数，我们可以在屏幕顶部显示重要的文本信息，在屏幕底部显示状态消息行。
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```
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void
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print_header(const char *text)
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{
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move(0, 0);
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clrtoeol();
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attron(A_BOLD);
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mvaddstr(0, (COLS / 2) - (strlen(text) / 2), text);
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attroff(A_BOLD);
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refresh();
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}
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void
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print_status(const char *text)
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{
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move(LINES - 1, 0);
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clrtoeol();
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attron(A_REVERSE);
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mvaddstr(LINES - 1, 0, text);
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attroff(A_REVERSE);
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refresh();
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}
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```
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通过这些函数，我们就可以构建猜数字游戏的主要部分。首先，程序为 `ncurses` 设置终端，然后从 0 到 7 中选择一个随机数。显示数字刻度后，程序启动一个循环，询问用户的猜测。
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当用户进行猜测时，程序会在屏幕上提供反馈。如果猜测太低，程序会在屏幕上的数字下方打印一个左方括号。如果猜测太高，程序会在屏幕上的数字下方打印一个右方括号。这有助于用户缩小他们的选择范围，直到他们猜出正确的数字。
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```
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int
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main()
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{
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int number, guess;
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initscr();
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cbreak();
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noecho();
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number = random0_7();
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mvprintw(1, COLS - 1, "%d", number); /* debugging */
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print_header("Guess the number 0-7");
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mvaddstr(9, (COLS / 2) - 7, "0 1 2 3 4 5 6 7");
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print_status("Make a guess...");
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do {
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guess = read_guess();
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move(10, (COLS / 2) - 7 + (guess * 2));
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if (guess < number) {
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addch('[');
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print_status("Too low");
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}
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else if (guess > number) {
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addch(']');
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print_status("Too high");
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}
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else {
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addch('^');
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}
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} while (guess != number);
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print_header("That's right!");
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print_status("Press any key to quit");
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getch();
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endwin();
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return 0;
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}
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```
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复制这个程序，自己尝试编译它。不要忘记你需要告诉 GCC 编译器链接到 `ncurses` 库：
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```
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$ gcc -o guess guess.c -lncurses
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```
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我留下了一个调试行，所以你可以看到屏幕右上角附近的秘密数字：
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![guess number game interface][3]
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图1：猜数字游戏。注意右上角的秘密数字。
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### 开始使用 ncurses
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该程序使用了 `ncurses` 的许多其它功能，你可以从这些功能开始。例如，`print_header` 函数在屏幕顶部居中以粗体文本打印消息，`print_status` 函数在屏幕左下角以反向文本打印消息。使用它来帮助你开始使用 `ncurses` 编程。
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--------------------------------------------------------------------------------
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via: https://opensource.com/article/21/8/guess-number-game-ncurses-linux
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作者：[Jim Hall][a]
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选题：[lujun9972][b]
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译者：[perfiffer](https://github.com/perfiffer)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://opensource.com/users/jim-hall
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[b]: https://github.com/lujun9972
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[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/question-mark_chalkboard.jpg?itok=DaG4tje9 (question mark in chalk)
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[2]: https://linux.cn/article-13756-1.html
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[3]: https://opensource.com/sites/default/files/guessnumber07.png
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