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Why aren't variable-length arrays part of the C++ standard?
Having to create a potential large array on the stack, which usually has only little space available, isn't good. If you know the size beforehand, you can use a static array. And if you don't know the size beforehand, you will write unsafe code. Variable-length arrays can not be included natively in C++ because they'll require huge changes in the type system.
An alternative to Variable-length arrays in C++ is provided in the C++ STL, the vector. You can use it like −
Example
#include<iostream>
#include<vector>
using namespace std;
int main() {
vector<int> vec;
vec.push_back(1);
vec.push_back(2);
vec.push_back(3);
vec.push_back(4);
vec.push_back(5);
// ...
// To iterate over it:
for(vector<int>::iterator it = vec.begin(); it != vec.end(); it++) {
cout << *it << endl;
}
return 0;
}Output
This will give the output −
1 2 3 4 5
Updated on: 24-Jun-2020
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