题目描述

这题一定要认真看题，信息很多，稍不注意就会出错，把每一步都看清楚。

样例

#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
    double n1,n2,n3,n4,x,y,z;
    cin>>n1>>n2>>n3>>n4;
    x=(2.0*n1+3.0*n2+4.0*n3+1.0*n4)/10.0;
    cout<<fixed<<setprecision(1)<<"Media: "<<x<<endl;
    if(x>=7.0)
    cout<<"Aluno aprovado."<<endl;
    else if(x<5.0)
    cout<<"Aluno reprovado."<<endl;
    else if(x<7.0&&x>=5.0)
    {
        cout<<"Aluno em exame."<<endl;
        cin>>y;
        cout<<fixed<<setprecision(1)<<"Nota do exame: "<<y<<endl;
        z=(x+y)/2;
        if(z>=5.0)
        cout<<"Aluno aprovado."<<endl;
        else    
        cout<<"Aluno reprovado."<<endl;
        cout<<fixed<<setprecision(1)<<"Media final: "<<z<<endl;
    }
    return 0;
}