I will clarify, although this does belong in the beginners section.
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int a; // Int
int b = 10; // Int with value of 10
int c[10]; // Array of 10 Ints, with invalid values
int d[10] = {0}; // Array of 10 ints, all set to 0
cout << "Enter d[0]: ";
cin >> d[0];
cout << "D[0] = " << d[0] << endl;