3-1.cpp

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#include<iostream.h>
void main()
{
  int year,leap;
  cout<<"输入一年号:";
  cin>>year;
  if(year%400==0)
     leap=1;
  else if(year%4==0&&year%100!=0)
     leap=1;
  else 
     leap=0;
  if(leap)cout<<year<<"是闰年\n";
  else cout<<year<<"不是闰年\n";
}