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 Data Structures  |  Question 179 of 198    Print  
What is the use of fflush() function?

  
Total Answers and Comments: 1 Last Update: September 05, 2007     Asked by: manas kumar naik 
  
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 Best Rated Answer
—
Submitted by: mswaroop
 
Suppose we read a sentence using scanf e.g. "My name is ABC" in a string.
Printing this string using a printf statement prints "My".

Go for another successive scanf.
It reads from the input stream... which still is having "name is ABC".
Hence pritning the string this time shows "name".

Solution to this is a fflush statement after first printf.
This clears the input stream.

As a result next scanf reads fresh string passed to it at the command prompt.

Code:

 n=2;
 while (n)
 {
  printf( "Input a sentencen" );
  scanf( "%s", string );
  printf( "First word is: %sn", string );
  fflush ( stdin );                                     //comment it once and see the difference
  n--;
 }

Above answer was rated as good by the following members:
rajani_vaddepalli15, aman15490
September 05, 2007 07:26:07   #1  
mswaroop Member Since: September 2007   Contribution: 1    
RE: What is the use of fflush() function?
Suppose we read a sentence using scanf e.g. "My name is ABC" in a string.
Printing this string using a printf statement prints "My".

Go for another successive scanf.
It reads from the input stream... which still is having "name is ABC".
Hence pritning the string this time shows "name".

Solution to this is a fflush statement after first printf.
This clears the input stream.

As a result next scanf reads fresh string passed to it at the command prompt.

Code:

 n=2;
 while (n)
 {
  printf( "Input a sentencen" );
  scanf( "%s", string );
  printf( "First word is: %sn", string );
  fflush ( stdin );                                     //comment it once and see the difference
  n--;
 }
 
Is this answer useful? Yes | NoAnswer is useful 2   Answer is not useful 0Overall Rating: +2    

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