题解 2773: 计算线段长度

解题思路:

注意事项:

参考代码:

#include<stdio.h>

#include<math.h>

int main()

{

double xa = 0;

double ya = 0;

double xb = 0;

double yb = 0;

double d = 0;

scanf("%lf %lf\n", &xa, &ya);

scanf("%lf %lf\n", &xb, &yb);

d = sqrt((xb-xa)*(xb-xa)+(yb-ya)*(yb-ya));

printf("%.3lf", d);

return 0;

}