c++计算前一天日期

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#include <iostream>

using namespace std;

int main()

{int year,month,day;

cin>>year>>month>>day;

if(year<1799||year>2051||day>31||month>12)

{cout<<"输入错误"<<endl;return 0;}

if(((year%100==0&&year%400==0)&&(year%100!=0||year%4==0))&&month==3&&day==1)

{

cout<<year<<" 2 "<<"29"<<endl;return 0;}

if(((year%100==0&&year%400!=0)||year%4!=0)&&month==3&&day==1)

{ cout<<year<<" 2 "<<"28"<<endl;return 0;}

if(month==1&&day==1)

{cout<<year-1<<" 12"<<" 31"<<endl;return 0;}

if((month==2||month==4||month==6||month==9||month==11)&&day==1)

{cout<<year<<" "<<month-1<<" 31"<<endl;return 0;}

if(month==5||month==7||month==8||month==10||month==12)

{cout<<year<<" "<<month-1<<" 30"<<endl;return 0;}

else cout<<year<<" "<<month<<" "<<day-1<<endl;

return 0;

}

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