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求助。。。typedef struct Point
{
double x ;
double y ;
} Point ;
Point p[4] ;
p[3].x = p[0].x - p[1].x + p[2].x ;
p[3].y = p[0].y - p[1].y + p[2].y ;
printf( "%.3lf %.3lf\n" , p[3].x , p[3].y ) ;
为何WA?
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