#include <stdio.h>

int main(void)

{

           int a[20]={0,1,2,9,4,5,9,7,8,9,

                            8,7,6,5,4,3,2,1,0,1};

           int sum = 0;

    int *p =a;

           // 홀수의값을얻으려면2개씩더해서..

           for(int i=0;i<20;i+=2)

           {

                     sum += *(p+i);

           }

           printf("\nSUM = %d",sum);

           ///////////////////////////////////////////////////////////////

           //   2번째

           // 다시a 의포인터를받자

            p =a;

            // 첫번째주소출력

            printf("\nFirst Address = %d",a);

           for(int i=0;i<20;i++)

           {

                     if(*(p+i) ==9)

                     {

                                 printf("\n9' Address = %d",p+i);

                     }         

           }

           printf("\nSUM = %d",sum);

           ///////////////////////////////////////////////////////////////

           //   3번째

           // 다시a 의포인터를받자

            p =a;

          for(int i=1;i<20;i++)

           {

                     if(*(p+i) ==9) //9 라면

                     {

                                 printf("\n9' Address = %d", i);

                                for(int j=i-1;j>=0;j--)

                                {

                                          if(*(p+j)==9) break; // 이미앞에9가있다면바꾸지않겠다.

                                          // 9 가없다면앞으로이동하자.

                                          int temp = *(p+j+1);

                                          *(p+j+1) = *(p+j);

                                          *(p+j) =  temp;

                                           printf("\nj = %d", j);

                                }

                     }

           }

            p =a;

            printf("\n result:");

            for(int i=0;i<20;i+=1)

           {

                     printf(" %d", *(p+i));

           }

}