c++ strchr函数_strchr函数返回_模拟实现strchr函数(34)

}

int opposite_side(point3 p1,point3p2,plane3 s){

returndmult(pvec(s),subt(p1,s.a))*dmult(pvec(s),subt(p2,s.a))<-eps;

}

int opposite_side(point3 p1,point3p2,point3 s1,point3 s2,point3 s3){

returndmult(pvec(s1,s2,s3),subt(p1,s1))*dmult(pvec(s1,s2,s3),subt(p2,s1))<-eps;

}

int parallel(line3 u,line3 v){

returnvlen(xmult(subt(u.a,u.b),subt(v.a,v.b)))<eps;

}

int parallel(point3 u1,point3 u2,point3v1,point3 v2){

returnvlen(xmult(subt(u1,u2),subt(v1,v2)))<eps;

}

int parallel(plane3 u,plane3 v){

returnvlen(xmult(pvec(u),pvec(v)))<eps;

}

int parallel(point3 u1,point3 u2,point3u3,point3 v1,point3 v2,point3 v3){

returnvlen(xmult(pvec(u1,u2,u3),pvec(v1,v2,v3)))<eps;

}

int parallel(line3 l,plane3 s){

returnzero(dmult(subt(l.a,l.b),pvec(s)));

}

int parallel(point3 l1,point3 l2,point3s1,point3 s2,point3 s3){

returnzero(dmult(subt(l1,l2),pvec(s1,s2,s3)));

}

int perpendicular(line3 u,line3 v){

returnzero(dmult(subt(u.a,u.b),subt(v.a,v.b)));

}

int perpendicular(point3 u1,point3u2,point3 v1,point3 v2){

returnzero(dmult(subt(u1,u2),subt(v1,v2)));

}

int perpendicular(plane3 u,plane3 v){

returnzero(dmult(pvec(u),pvec(v)));

}

int perpendicular(point3 u1,point3u2,point3 u3,point3 v1,point3 v2,point3 v3){

returnzero(dmult(pvec(u1,u2,u3),pvec(v1,v2,v3)));

}

int perpendicular(line3 l,plane3 s){

returnvlen(xmult(subt(l.a,l.b),pvec(s)))<eps;

}

int perpendicular(point3 l1,point3l2,point3 s1,point3 s2,point3 s3){

returnvlen(xmult(subt(l1,l2),pvec(s1,s2,s3)))<eps;

}

int intersect_in(line3 u,line3 v){

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