C语言 如何从简单的 C 程序中清除屏幕？
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How to clear screen from simple C program?
提问by Rahul Subedi
#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;
}
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 ?
我正在使用代码块，但我不知道如何清除屏幕。我搜索然后system("cls");在头文件中找到#include<cstdlib>，但它显示错误cstdlib: no such file of directory。我该怎么办 ？
回答by Karthik T
Change
改变
#include <cstdlib>
to
到
#include <stdlib.h>
cstdlibis a C++ header file, and thus will be unusable in C.
cstdlib是C++ 头文件，因此在 C中将无法使用。
回答by luser droog
Clearing the screen is outside the purview of a normal C program. It depends on the operating system.
清除屏幕超出了普通 C 程序的权限。这取决于操作系统。
For windows, you should look into conio.
对于 Windows，您应该查看conio。
For unix, look into cursesor termios.
system()always launches a sub-shell which may or may not have any effect on the environment of the parent program. You doneed a system-call, but nota system()call.
system()总是启动一个子shell，它可能会或可能不会对父程序的环境产生任何影响。您确实需要一个system-call，但不需要一个system()电话。
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. :)
我并不总是知道这一点。我曾经（很久以前）在 comp.lang.c 中建议有人应该尝试system("exit");关闭 DOS 程序周围的窗口。但这当然行不通。我很快被建议在发布之前测试我的代码。:)
回答by Keith Nicholas
you have lots of problems in your code....
你的代码有很多问题......
but for the specific problem, try #include <stdlib.h>
但对于特定问题，请尝试 #include <stdlib.h>
回答by Hymanotonye
use the #include<stdlib.h>that's where the clear screen function is defined.
使用#include<stdlib.h>那是定义清除屏幕功能的地方。
回答by Mike
To use system("cls")you need the header <iostream>. This will allow all system()types to execute. Unsure if it is a C++ header file, but it works for the compiler that I use.
要使用，system("cls")您需要 header <iostream>。这将允许所有system()类型执行。不确定它是否是 C++ 头文件，但它适用于我使用的编译器。
