#include <stdio.h>
int main(void){
    int score[10]={1, 2, 3, 4, 5};  //score[5~9]=0
    int i, op =2, sum=0;
    switch(op){ //switch(2)
        case 1:
            for(i=0; i<10; i++)
                sum+=score[i];
            printf("%d\n", sum);
            break;
        case 2:  //switch(2) 실행
            for(i=3; i<10; i++)
                sum+=score[i];
                //sum=score[3]+score[4]+score[5]+...+score[9]
            printf("%d\n", sum);
            //sum=4+5=9 출력
            //break; 있었다면 default; 실행X
        default:  //case 2에 break;가 없으니까 default; 실행
            for(i=5; i<10; i++)
                sum+=score[i];
                //sum=sum+score[5]+...+score[9]
            printf("%d\n", sum);
            //sum=9+0+...+0 = 9 출력
            break;
    }
    return 0;
}