CODEWITHSUNDEEP
c++c++11
Qiu YU
Qiu YU

Reputation: 519

Variable-sized object may not be initialized problem in array

When I try to run this simple code, it returns a Variable-sized object may not be initialized error. I have no idea why and how to resolve this problem.

int main()
{
    int n=0;
    n=1;
    int a[n]={}, b[n]={};
    return 0;
}

Upvotes: 2

Views: 128

Answers (3)

user14157591
user14157591

Reputation:

Try this:

const int n=1;

int main()
{
    int a[n]={}, b[n]={};
    return 0;
}

The above code will let you create an array with length n. Note: n can't be changed.

Upvotes: 0

Icebone1000
Icebone1000

Reputation: 1321

The array lenght must be known at compile time. Either

int a[1];

or

constexpr int n = 1;
int a[n];

Otherwise you need a dynamic array like the std container std::vector.

Upvotes: 2

NutCracker
NutCracker

Reputation: 12263

You can initialize your array properly with the std::fill_n like:

std::fill_n(a, n, 0);
std::fill_n(b, n, 0);

or use std::vector like:

std::vector<int> a(n);

It will initialize all the elements to 0 by default.

Or, you can have something like:

constexpr size_t n = 10;
int a[n]{};

This will also initialize all the elements to 0.

Upvotes: 0

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