#include <math.h> #include<stdio.h> #include <stdlib.h> int main() { double x1,x2,y1,y2,e,m,g; scanf("%lf %lf\n",&x1,&y1); scanf("%lf %lf\n",&x2,&y2); e=sqrt(pow(x1-x2,2)+pow(y1-y2,2)); m=fabs(x1-x2)+fabs(y1-y2); g=fabs(m-e); printf("%.6f&qu...