萬年曆

int main ()
{
    char* month[] = {
        "January", "Feburary", "March", "Appril", "May", "June",
        "July", "August", "September","Octorbor","November","December"
    };
    int i,p,y, m[] = {1,-2,1,0,1,0,1,1,0,1,0,1};

    cout << "Enter year: "; 
    cin  >> y;
    
    i = y - 1; 
    p = (y + i/4 - i/100 + i/400) % 7;      //算當年1月1日的位置
    
    if (y%4==0 && y%100 || y%400==0) 
        m[1] = -1;

    for (y=0; y<12; y++) 
    {
        cout << "\n------- "<<month[y]<<" -------" 
             << "\n Su Mo Tu We Th Fr Sa\n";

        for (i=p; i--;) cout <<"   ";
        for (i=1; i<=m[y]+30; i++) 
            printf (" %2d%s", i, (p+i)%7? "":"\n");  

        p = (p + m[y] + 30) % 7;
    }
}