C++ Reference: Standard C++ Library reference: C Library: cstdio: clearerr

C++官网参考链接：https://cplusplus.com/reference/cstdio/clearerr/

函数
<cstdio>
clearerr
void clearerr ( FILE * stream );
清除错误指示符
重置stream的错误和文件结束指示符。
当I/O函数由于错误或已到达文件结束而失败时，可以为stream设置这些内部指示符之一。这些指示符的状态可以通过调用这个函数来清除，也可以通过调用rewind，fseek，fsetpos和freopen中的任何一个来清除。

形参
stream
指向标识流的FILE对象的指针。

返回值
没有返回值。

用例
/* writing errors */
#include <stdio.h>
int main ()
{
FILE * pFile;
pFile = fopen("myfile.txt","r");
if (pFile==NULL) perror ("Error opening file");
else {
fputc ('x',pFile);
if (ferror (pFile)) {
printf ("Error Writing to myfile.txt\n");
clearerr (pFile);
}
fgetc (pFile);
if (!ferror (pFile))
printf ("No errors reading myfile.txt\n");
fclose (pFile);
}
return 0;
}
这个程序打开一个名为myfile.txt的现有文件进行读取，并在尝试写入时导致I/O错误。该错误使用clearerr清除，因此第二次错误检查返回假。
输出：

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