浙大版《C语言程序设计（第3版）》题目集 习题5-3 使用函数计算两点间的距离

#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;
}

/* 你的代码将被嵌在这里 */

double dist( double x1, double y1, double x2, double y2 )
{
  return sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
}