人生第一道水題 計算兩點間距離

#include<stdio.h> #include<math.h> int main() { double x1,y1,x2,y2,s; while(scanf("%lf %lf %lf %lf",&x1,&y1,&x2,&y2)!=EOF) { s=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)); printf("%.2lf

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