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#include <cmath>
#include <iostream>
struct Coordinate {
double x;
double y;
double Distance();
double Coordinate::Distance(){
double t = this->x * this->x + this->y * this->y;
return std::sqrt( t );
int main(){
Coordinate p;//点P
p.x = 3.0f;
p.y = 4.0f;
std::cout << p.Distance() << std::endl;
return 0;
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