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c:stdio.h:fflush

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c:stdio.h:fflush [2013/01/22 22:02] (current)
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 +{{keywords>wiki library source code example reference}}
 +===== fflush =====
  
 +<code c>
 +    int fflush(FILE *stream);
 +</code>
 +
 +Flushes stream stream and returns zero on success or EOF on error. Effect undefined for input stream. fflush(NULL) flushes all output streams.
 +
 +===== C Sourcecode Example =====
 +<code c>
 +/* 
 + * fflush example code
 + * http://code-reference.com/c/stdio.h/fflush 
 + */
 +
 +#include <stdio.h> /* including standard library */
 +//#include <windows.h> /* uncomment this for Windows */
 +
 +#define MAX 80
 +int main( void )
 +{
 +  FILE *filestream = fopen("test.txt", "rt+");
 +  char buffer[MAX];
 +  if (filestream)
 +  {
 +    fputs("write this in a file", filestream);
 +    fflush(filestream); /* uncomment this function to see what's happend */
 +    fgets(buffer, MAX, filestream);
 +    puts(buffer);
 +    fclose(filestream);
 +  }
 +  return 0;
 +}
 +</code>
 +
 +=== test.txt ===
 +file test.txt
 +<code c>
 +Line 1
 +#Line2
 +Line 3
 +#Line 4 
 +Line 
 +</code>
 +
 +==== fflush output ====
 +    output: ./fflush
 +
 +test.txt after running the programm    
 +<code c>
 +write this in a file
 +#Line 4 
 +Line 5
 +</code>
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c/stdio.h/fflush.txt · Last modified: 2013/01/22 22:02 (external edit)

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