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// Given an array A and the address of element A[x], find the value of  x#include <stdio.h>#define TESTVALUE 5int main(void){  int x=TESTVALUE;  int A[]={0,1,2,3,4,5,6,7,8,9};  printf("x=%d\n", (&A[x] - &A[0]));  return 0;}