c++ strchr函数_strchr函数返回_模拟实现strchr函数(26)

}

double distance(double x1,double y1,doublex2,double y2){

returnsqrt((x1-x2)*(x1-x2)(y1-y2)*(y1-y2));

}

int dots_inline(point p1,point p2,pointp3){

returnzero(xmult(p1,p2,p3));

}

int dots_inline(double x1,double y1,doublex2,double y2,double x3,double y3){

returnzero(xmult(x1,y1,x2,y2,x3,y3));

}

int dot_online_in(point p,line l){

returnzero(xmult(p,l.a,l.b))&&(l.a.x-p.x)*(l.b.x-p.x)<eps&&(l.a.y-p.y)*(l.b.y-p.y)<eps;

}

int dot_online_in(point p,point l1,pointl2){

returnzero(xmult(p,l1,l2))&&(l1.x-p.x)*(l2.x-p.x)<eps&&(l1.y-p.y)*(l2.y-p.y)<eps;

}

int dot_online_in(double x,double y,doublex1,double y1,double x2,double y2){

returnzero(xmult(x,y,x1,y1,x2,y2))&&(x1-x)*(x2-x)<eps&&(y1-y)*(y2-y)<eps;

}

int dot_online_ex(point p,line l){

returndot_online_in(p,l)&&(!zero(p.x-l.a.x)||!zero(p.y-l.a.y))&&(!zero(p.x-l.b.x)||!zero(p.y-l.b.y));

}

int dot_online_ex(point p,point l1,pointl2){

returndot_online_in(p,l1,l2)&&(!zero(p.x-l1.x)||!zero(p.y-l1.y))&&(!zero(p.x-l2.x)||!zero(p.y-l2.y));

}

int dot_online_ex(double x,double y,doublex1,double y1,double x2,double y2){

returndot_online_in(x,y,x1,y1,x2,y2)&&(!zero(x-x1)||!zero(y-y1))&&(!zero(x-x2)||!zero(y-y2));

}

int same_side(point p1,point p2,line l){

returnxmult(l.a,p1,l.b)*xmult(l.a,p2,l.b)>eps;

}

int same_side(point p1,point p2,pointl1,point l2){

returnxmult(l1,p1,l2)*xmult(l1,p2,l2)>eps;

}

int opposite_side(point p1,point p2,linel){

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