What are the two common ways of selecting array elements for processing

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What are the two common ways of selecting array elements for processing.

Ans.

• One way is to select elements by array index:

          int a[10];
          printf("%d", a[7]);   //using array index

• Another way is to select elements by pointer:

          int a[10];
          printf("%d", *(a+7));   //using pointer