#include <stdio.h>

void main()
  {
    FILE *fp;
    int c;

    c = 'J';
    fp = fopen( "file", "w" );
    if( fp != NULL ) {
      fputc( c, fp );
      if( ferror( fp ) ) {  /* if error        */
        clearerr( fp );   /* clear the error */
        fputc( c, fp );   /* and retry it    */
      }
    }
  }