/* ECP: FILEname=fig1_12.c */

/* 1*/   #include <stdio.h>

/* 2*/   /* Read Items, Compute Their Average */

/* 3*/   main( void )
/* 4*/   {
/* 5*/       FILE *Fp;                    /* File Pointer */
/* 6*/       char FileName[ 256 ];        /* File Name */
/* 7*/       int ItemsRead = 0;
/* 8*/       double ThisItem, Sum = 0.0;

/* 9*/       printf( "Enter input file: " );
/*10*/       if( scanf( "%s", FileName ) != 1 ||
/*11*/               ( Fp = fopen( FileName, "r" ) ) == NULL )
/*12*/       {
/*13*/           fprintf( stderr, "Cannot open input file\n" );
/*14*/           return 1;
/*15*/       }

/*16*/       while( fscanf( Fp, "%lf", &ThisItem ) == 1 )
/*17*/       {
/*18*/           ItemsRead++;
/*19*/           Sum += ThisItem;
/*20*/       }

/*21*/       printf( "The average of %d items was %f\n",
/*22*/               ItemsRead, Sum / ItemsRead );

/*23*/       return 0;
/*24*/   }