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 (10分)

#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)
{
    double ret;
    ret = sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
    return ret;
}