题目内容

写出下列程序的执行结果是：__________________。#include using namespace std; #include class Point { public : Point( double x, double y ) { a = x;b = y; } friend double d( Point &A , Point &B ) { return sqrt((A.a-B.a) * (A.a-B.a) + (A.b-B.b) * (A.b-B.b)) ; } private: double a, b ; }; void main() { Point p1( 1, 1 ) ; Point p2( 4, 5 ) ; cout << d( p1,p2 ) << endl ; }

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