题目描述

按照示例保留一位浮点数
3个分支分别写出即可

样例

#include <iostream>
#include<cmath>
using namespace std;

int main()
{
    double N1,N2,N3,N4,X,Y,Z;
    scanf("%lf %lf %lf %lf\n",&N1,&N2,&N3,&N4);
    X=0.2*N1+0.3*N2+0.4*N3+0.1*N4;
    printf("Media: %.1lf\n",X);

    if(X>=7.0)printf("Aluno aprovado.");
    else if(X<5.0)printf("Aluno reprovado.");
    else
    {
        printf("Aluno em exame.\n");
        scanf("%lf",&Y) ;
        printf("Nota do exame: %.1lf\n",Y);
        Z=(X+Y)/2;

        if(Z>=5.0)printf("Aluno aprovado.\n");
        else printf("Aluno reprovado.\n");

        printf("Media final: %.1lf\n",Z);
    }
    return 0;
}