#include <stdio.h>

int main() {
   int i,j,array[10]={ 17,23,34,54,12,56,31,56,56,12};
   printf("enter two numbers \n");
   scanf("%d %d",&i ,&j);
   
   int sum = array[i] + array [j];
   int difference = array[i] - array[j];
   
       printf("the sum of two elements is :%d \n",sum);
   printf("the difference of the two elements is :%d\n", difference);
   
    return 0;
}