Why do C/C++ array indexes start from zero?

Since the array index starts from 0, a[i] can be implemented as *(a i).

If the array index starts from 1, then a[i] will be implemented as *(a i-1), which will consume more time during the compilation process, and the performance of the program will also be affected.

Therefore, it is better to index the array starting from 0.

Given a simple array program -

Sample code

int main() {
   int array[5] = {7, 7, 7, 6, 6};
   for (int i = 0; i < 5; i++)
      cout << *(array + i);
   return 0;
}

Output

7 7 7 6 6

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