c++第2次作业

#include<iostream>#include<cmath>using namespace std;int main(){double x1,y1,x2,y2;double d;double m,n;cout<<"请输入两点坐标:";cin>>x1>>y1>>x2>>y2;m=x1-x2;n=y1-y2;d=sqrt(m*m+n*n);cout<<"两点间的距离为:"<<d<<endl;return 0;}

#include<iostream>  using namespace std;;  int main()  {      int x=0,y=0;  cin>>x;  if(x>=1)  y=x-1;  else     y=-x+1;  cout<<y;  return 0;  }