如何从简单的C程序清屏？ [英] How to clear screen from simple C program?

问题描述

#include <stdio.h>
#include <cstdlib>

rec();

main() 
{
    int a, fact;
    char q, n, y;
    printf("\nEnter any number ");
    scanf("%d", & a);
    fact = rec(a);
    printf("Factorial value = %d\n", fact);
    printf("do you want to exit.....(y/n):");
    scanf("%s" ,&q);
    if (q == 'n')
    {
        system("cls");
        main();
    }
    else
        return 0;
}

rec(int x) 
{
    int f;
    if (x == 1) 
        return 1;
    else 
        f = x * rec(x - 1);

    return f;
}

我使用code块，但我不知道如何清除屏幕。我搜索，然后找到系统（CLS）; 头文件中的＃包括＆LT; cstdlib＆GT; ，但它显示了误差 cstdlib：目录中没有这样的文件。我应该怎么办？

I'm using code blocks but I don't know how to clear the screen. I searched then found system("cls"); within header file #include<cstdlib>, but it shows the error cstdlib: no such file of directory. What should I do ?

推荐答案

清除屏幕是正常的C程序的范围之外。这取决于操作系统。

Clearing the screen is outside the purview of a normal C program. It depends on the operating system.

有关窗口，你应该看看 conio

For windows, you should look into conio.

对于UNIX，看看诅咒问题或< A HREF =/问题/标记/ termios的类=标签后称号=显示标记的问题'的termios'的rel =标签>的termios 。

For unix, look into curses or termios.

系统（）总是启动子壳可能会或可能不会对父程序的环境的任何影响。您的做的需要的系统调用的，但是的不的一个系统（）电话。

system() always launches a sub-shell which may or may not have any effect on the environment of the parent program. You do need a system-call, but not a system() call.

我并不总是知道这一点。我曾经（不久前）在comp.lang.c建议，应该有人尝试系统（退出）; 来紧密围绕DOS程序的窗口。但是，当然，不能工作。而我连忙劝发布前测试我的code。 ：）

I didn't always know this. I once (long ago) suggested in comp.lang.c that someone should try system("exit"); to close the window around the DOS program. But that, of course, cannot work. And I was quickly advised to test my code before posting. :)

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