#include<stdio.h>#include<math.h>int main(){ int x1, x2, y1, y2;scanf("%d%d", &x1,&y1 ); scanf("%d%d", &x2, &y2); double de, dm, a; de = sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2)); dm = fabs(x1 - x2) + fabs(y1 - y2); a = fabs(dm - de); printf(...