每天三题系列之杭电OJ 2003 2004 2005

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include<iostream>//2003
#include<cmath>
#include<iomanip>
using namespace std;
int main ()
{
    double a;
    while(cin>>a)
        cout<<fixed << setprecision(2)<<abs(a)<<endl;
}

#include<iostream>//2004
using namespace std;
int main ()
{
    int a;
    while(cin>>a)
    {
        if(a<=100&&a>=90)
            cout<<"A"<<endl;
        else if(a>=80&&a<=89)
            cout<<"B"<<endl;
        else if(a>=70&&a<=79)
            cout<<"C"<<endl;
        else if(a>=60&&a<=69)
            cout<<"D"<<endl;
        else if(a>=0&&a<=59)
            cout<<"E"<<endl;
        else cout<<"Score is error!"<<endl;
    }
    return 0;
}

#include<iostream>//2005
using namespace std;
int main ()
{
    int a,b,c;
    char d;
    while(cin>>a>>d>>b>>d>>c)
    {
        int e=0;
        switch(b)
        {
        case 12:e+=30;
            case 11:e+=31;
            case 10: e+=30;
            case 9: e+=31;
            case 8: e+=31;
            case 7: e+=30;
            case 6: e+=31;
            case 5: e+=30;
            case 4: e+=31;
            case 3: if((a%4==0&&a%100!=0)||(a%400==0))
                     e+=29;
                    else e+=28;
            case 2: e+=31;

        }
        cout<<e+c<<endl;
    }
    return 0;
}