class line{public: line(double a,double b,double c,double d); bool isJiao(line line2); double x1; double y1; double x2; double y2;};line::line(double a,double b,double c,double d){ x1=a; y1=b; x2=c; y2=d;}bool line::isJiao(line line2){ if((x1==x2) && (line2.x1==line2.x2)){return false; } e...
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