C++ 代码

#include<cstdio>
#include<cmath>

int main(){
    double N1,N2,N3,N4,X,Y,Z;
    scanf("%lf%lf%lf%lf",&N1,&N2,&N3,&N4);
    X = (N1*2+N2*3+N3*4+N4)/10;
    printf("Media: %.1f\n",round(X*10)/10);
    if(X>=7.0) printf("Aluno aprovado.\n");
    else if(X<5.0) printf("Aluno reprovado.\n");
    else {
    //if(X>=5.0&&X<7.0)
        printf("Aluno em exame.\n");
    scanf("%lf",&Y);
    printf("Nota do exame: %.1f\n",Y);
    Z = (X+Y)/2;
    if(Z>=5.0) printf("Aluno aprovado.\n");
    else printf("Aluno reprovado.\n");
    printf("Media final: %.1f\n",Z);
    }

    return 0;
}