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本题要求实现一个函数，对给定平面任意两点坐标(x1,y1)和(x2,y2)，求这两点之间的距离。
函数接口定义：

double dist( double x1, double y1, double x2, double y2 );

其中用户传入的参数为平面上两个点的坐标(x1, y1)和(x2, y2)，函数dist应返回两点间的距离。

#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <math.h>double dist(double x1, double y1, double x2, double y2);int main()
{double x1, y1, x2, y2;scanf("%lf %lf %lf %lf", &x1, &y1, &x2, &y2);printf("dist = %.2f\n", dist(x1, y1, x2, y2));return 0;
}double dist(double x1, double y1, double x2, double y2)
{return sqrt((y1 - y2) * (y1 - y2) + (x1 - x2) * (x1 - x2));
}