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145 halyavin 1 
#include "stdio.h"
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int ungetc(int c,FILE* file)
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{
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	if (c==EOF)
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		return EOF;
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	if (file->filepos<=0 || file->filepos>file->filesize)
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		return EOF;
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	file->filepos--;
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	file->buffer[file->filepos]=(char)c;
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	return c;
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}