PAT---数字分类

C++设置输出小数位的函数

#include<iomanip>

cout << setiosfalgs(ios::fixed)<<setprecision(2)<<2.119;

 

 

#include<iostream> 
#include<vector>
#include<iomanip>

using namespace std;

int main()
{
    int num;
    
    cin>>num;
    
    int *test=new int[num];
    int tmp=0;
    for(int i=0;i<num;i++)
        cin >> test[i];
    
    vector<int> A1,A2,A3,A4,A5;
    for(int i=0;i<num;i++)
    {
        tmp=test[i]%5;
        switch(tmp)
        {
            case 0:
                if(test[i]%10==0)
                    A1.push_back(test[i]);
                break;
            case 1:
                A2.push_back(test[i]);
                break;
            case 2:
                A3.push_back(test[i]);
                break;
            case 3:
                A4.push_back(test[i]);
                break;
            case 4:
                A5.push_back(test[i]);
                break;
            default :
                break;
        }
    }

    double t_f=0.0;
    cout<<setiosflags(ios::fixed)<<setprecision(1);
    if(A1.size()==0)
        cout<<"N ";
    else
    {
        tmp=0;
        for(int i=0;i<A1.size();i++)
            if(A1[i]%2==0)
                tmp+=A1[i];
        cout <<tmp<<" ";
    }    
    
    if(A2.size()==0)
        cout<<"N ";
    else
    {
        int k=-1;
        tmp=0;
        for(int i=0;i<A2.size();i++)
        {
            k=0-k;
            tmp+=A2[i]*k;
        }
        cout<<tmp<<" ";
    }    
    if(A3.size()==0)
        cout<<"N ";
    else
        cout <<A3.size()<<" ";
    if(A4.size()==0)
        cout<<"N ";
    else
    {
        tmp=0;
        for(int i=0;i<A4.size();i++)
            tmp+=A4[i];
        t_f=tmp*1.00/A4.size();
        cout<<t_f<<" ";
    }
    if(A5.size()==0)
        cout<<"N ";
    else
    {
        tmp=0;
        for(int i=0;i<A5.size();i++)
            if(A5[i]>tmp)
                tmp=A5[i];
        cout<<tmp<<endl;
    }
    
    delete [] test;
    return 0;
}