Initialization of a normal array with one default

Question

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• How to initialize all members of an array to the same value? 19 answers

C++ Notes: Array Initialization has a nice list over initialization of arrays. I have a

int array[100] = {-1};

expecting it to be full with -1's but its not, only first value is and the rest are 0's mixed with random values.

The code

int array[100] = {0};

works just fine and sets each element to 0.

What am I missing here.. Can't one initialize it if the value isn't zero ?

2: Is the default initialization (as above ) faster than the usual loop through the whole array and assign a value or does it do the same thing?

Answer 1

For the case of an array of single-byte elements, you can use memset to set all elements to the same value.

There's an example here.