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/* ungetc example */
#include <stdio.h>
int main ()
{
FILE * pFile;
int c;
char buffer [256];
pFile = fopen ("myfile.txt","rt");
if (pFile==NULL) perror ("Error opening file");
else while (!feof (pFile)) {
c=getc (pFile);
if (c == EOF) break;
if (c == '#') ungetc ('@',pFile);
else ungetc (c,pFile);
if (fgets (buffer,255,pFile) != NULL)
fputs (buffer,stdout);
else break;
}
return 0;
}
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