Buổi học số 1. Cấu trúc tuần tự trong C++ (Bài 1 -> Bài 15)

  #include <bits/stdc++.h>>
  using namespace std;
  long long a,b;
  long long phan_nguyen;
  long long phan_du;
  int main()
  {
      freopen("abai1.inp","r",stdin);
      freopen("abai1.out","w",stdout);
      cin >> a >> b;
      phan_nguyen = a/b;
      phan_du = a%b;
      cout << phan_nguyen << " " << phan_du;
      return 0;
  }

#include <bits/stdc++.h>
int xa,ya,xb,yb,xc,yc;
float d_AB,d_BC,d_AC;
using namespace std;
float len(int xm, int ym, int xn, int yn){
    float d;
    d = 1.0*(sqrt(pow(xm-xn,2.0) + pow(ym-yn,2.0)));
    return d*1.0;
}
int main(){
    freopen("bai3.inp","r",stdin);
    freopen("bai3.out","w",stdout);
    cin>>xa>>ya>>xb>>yb>>xc>>yc;
    d_AB = len(xb,yb,xa,ya)*1.0;
    d_BC = len(xc,yc,xb,yb)*1.0;
    d_AC = len(xc,yc,xa,ya)*1.0;
    cout<<"d_AB = "<<fixed<<setprecision(3)<< d_AB<<endl;
    cout<<"d_BC = "<<fixed<<setprecision(3)<< d_BC<<endl;
    cout<<"d_AC = "<<fixed<<setprecision(3)<< d_AC<<endl;
}