You aren't allocating memory for an array, you are allocating only for one element. As someone said in the comments, the key is in the new Grades instruction

You aren't allocating memory for an array, you are allocating only for one element.

As someone said in the comments, the key is in the new Grades instruction

In addition, unless you have another i variable declared before (which is a bad practice), that code doesn't compile because (art1301 + i)->studentName = names[i]; will not find variable i