#include <stdio.h>
#include <cstring>

int main()
 {
    FILE* cfPtr ;
    char buffer[100] ;
    strcpy( buffer, "hello" ) ;
    if ( (cfPtr = fopen( "data1.txt" , "wb" ) ) == NULL )
		 {
                printf( "File could not be opened.\n" );
		 }
    else
       	 {
                for( int i1=100 ; i1 <= 110 ; i1++ )
                   {
                           fwrite( &i1, sizeof( i1 ), 1,  cfPtr ) ;
    		       }
    		    fwrite( buffer, strlen( buffer), 1,  cfPtr ) ;

                fclose ( cfPtr );
          }
  /* fclose closes the file */


     return 0;
}