C | Arrays | Question 10

Predict output of following program

int main()
{
    int i;
    int arr[5] = {1};
    for (i = 0; i < 5; i++)
        printf("%d ", arr[i]);
    return 0;
}

(A) 1 followed by four garbage values
(B) 1 0 0 0 0
(C) 1 1 1 1 1
(D) 0 0 0 0 0


Answer: (B)

Explanation: In C/C++, if we initialize an array with fewer members, all remaining members are automatically initialized as 0.

For example, the following statement initializes an array of size 1000 with values as 0.

     int arr[1000] = {0};  

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