關於double型別顯示的一些問題。

void print_double()
{
    char input;
    double number = 1234.56789,weight = 130.645789,height = 168,
        six = 666666.66666;     
    cout<<"original data:\n";
    cout<<number<<" "<<weight<<" "<<height<<" "<<six<<endl;
    //double輸出時，預設顯示6位資料,並且會4舍五入
 

    //如果是1.00則會顯示1；
    cout.setf(ios::fixed);
    cout.setf(ios::showpoint);
    cout.precision(2);
    //以上3行為設定double型變數所顯示小數點後的位數
    cout<<"precision(2) data:\n";
    cout<<number<<" "<<weight<<" "<<height<<endl;
    cout.precision(3);
    cout<<"precision(3) data:\n"
 
;
    cout<<number<<" "<<weight<<" "<<height<<endl;
    cout.precision(4);
    cout<<"precision(4) data:\n";
    cout<<number<<" "<<weight<<" "<<height<<endl;
    cin>>input;
}