Compilare: user.c: In function ‘main’: user.c:59:54: warning: operation on ‘j’ may be undefined [-Wsequence-point] array2[i] = (array1[j] + array1[++j] - array1[(j += (--found))]) / 2; ^ user.c:59:54: warning: operation on ‘j’ may be undefined [-Wsequence-point] user.c:65:8: warning: operation on ‘i’ may be undefined [-Wsequence-point] array2[++i] = array1[length1-2] - array2[i-2]; ^ user.c:40:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &length1); ^ user.c:54:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &array1[i]); ^