#include <stdio.h> #include<math.h> #define De(x1,x2,y1,y2) sqrt(pow(x1-x2,2)+pow(y1-y2,2)) #define Dm(x1,x2,y1,y2) abs(x1-x2)+abs(y1-y2) int main() { int a,b,c,d; scanf("%d %d\n%d %d",&a,&c,&b,&d); double sum = fabs(Dm(a,b,c,d)-De(a,b,c,d)); printf("%lf&qu...