Error(s):

source_file.c: In function ‘main’:
source_file.c:16:30: error: ‘i’ undeclared (first use in this function)
     printf("array[%d]=%d\n", i, array1[i]); 
                              ^
source_file.c:16:30: note: each undeclared identifier is reported only once for each function it appears in
source_file.c:8:6: warning: variable ‘array3’ set but not used [-Wunused-but-set-variable]
  int array3[n] = {1,2,3,4,5};
      ^