average 3

#include<stdio.h>
int main()
{
    float a,b,c,d,avg,e;
    scanf("%f %f %f %f",&a,&b,&c,&d);
    avg=(a*2+b*3+c*4+d*1)/10;
    if(avg>=7.0)
        printf("Media: %.1f\nAluno aprovado.\n",avg);
    else if(avg<5.0)
        printf("Media: %.1f\nAluno reprovado.\n",avg);
    else if(avg>=5.0 && avg<=6.9)
    {
        printf("Media: %.1f\nAluno em exame.\n",avg);
        scanf("%f",&e);
        avg=(avg+e)/2;
        printf("Nota do exame: %.1f\n",e);
        if(e>=5.0)
            printf("Aluno aprovado.\n");
        else
            printf("Aluno reprovado.\n");
        printf("Media final: %.1f\n",avg);
    }
    return 0;
}