Unit 18.9

#include<stdio.h>

int main(void)

{

    int Kor,Eng,Math,Sc;

    int avg=0,sum=0;

    scanf("%d %d %d %d",&Kor,&Eng,&Math,&Sc);

    

    if(Kor<0||Kor>100&&Eng<0||Eng>100&&Math<0||Math>100&&Sc<0||Sc>100)

    {

        printf("잘못된 점수\n");

    }

    

    

    else

    {

        sum=Kor+Eng+Math+Sc;

        avg=sum/4;

        if(avg>=85)

        {

            printf("합격");

        }

        else printf("불합격");

    }

    

}