ungetc : ungetc « stdio.h « C Tutorial

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C Tutorial » stdio.h » ungetc

22.39.1.ungetc

Item	Value
Header file	stdio.h
Declaration	int ungetc(int ch, FILE *stream);
Function	Put the character ch back to the input stream stream. This character will be obtained by the next read operation on stream.
Return	returns ch on success or EOF on failure.

A call to fflush(), fseek(), or rewind() discards the character.

You may not unget an EOF.

#include <stdio.h>



int main ()

{

  FILE * fp;

  int c;

  char buffer [256];

  fp = fopen ("test.txt","rt");

 

  if (fp==NULL)

    perror ("Error opening file");

  else {

    while (!feof (fp))

    {

      c=getc (fp);

      if (c == '#')

        ungetc ('@',fp);

      else

        ungetc (c,fp);

      fgets (buffer,255,fp);

      fputs (buffer,stdout);

    }

  }



  return 0; 

}

22.39.ungetc
	22.39.1.	ungetc

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