> #include <stdio.h>
> #include <math.h>
> int main ( void )
> {
>     int i, n, x, y, xx, yy;
>     double carea, area;
>     char ch;
> 
>     scanf ( "%d", &n );
>     for ( i = 0; i < n; i ++ )
>     {
> 	x = y = 0;
> 	carea = area = 0;
> 
> 	while ( 1 )
> 	{
> 	    xx = x;
> 	    yy = y;
> 	    scanf ( "%c", &ch );
> 	    if ( ch == '5' ) break;
> 	    switch ( ch )
> 	    {
> 		case '1':	x --;    y --;    break;
> 		case '2':	y --;	      	  break;
> 		case '3':	x ++;    y --;    break;
> 		case '4':	x --;             break;
> 		case '6':	x ++;             break;
> 		case '7':	x --;    y ++;    break;
> 		case '8':	y ++;             break;
> 		case '9':	x ++;    y ++;    break;
> 	    }
> 	    carea += xx * y - yy * x; 
> 	    if ( x == 0 && y == 0 ) 
> 	    {
> 		area += fabs ( carea );
> 		carea = 0;
> 	    }
> 	}
> 	area /= 2;
> 	printf ( "%.0f", area );
> 	if ( ceil ( area ) - area > 0.4 )  printf ( ".5" );
> 	printf ( "\n" );
>     }
>     return 0;
> }

• Re:double精度不够 (0) baofenye 2004-10-26 11:41:20
  • 请问 double 的精度为几位？ (29) baofenye 2004-10-26 11:43:14
    • Re:请问 double 的精度为几位？ (58) FinalLaugh 2004-10-26 12:29:46