#include <iostream>#include <math.h>using namespace std;//函数模板声明template<typename T>double dist(T t1,T t2, T t3, T t4);template<typename T>double dist(T t1,T t2, T t3, T t4){ return sqrt((t1-t2)*(t1-t2)+(t3-t4)*(t3-t4)); }//实例化模块函数double dist(int x1,int y1,int x2,int y2){ return sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));}double dist(double x1,double y1,double x2,double y2){ return sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));} int main(){ int a = 2, b = 4, c = 5, d = 6; double x = 3.2, y = 5.4, w = 6.5, z = 8.6; double d1 = dist(a,b,c,d); double d2 = dist(x,y,w,z); cout<<"d1="<<d1<<endl; cout<<"d2="<<d2<<endl; return 0;}