In C, you can use a constant when declaring an array:
const n = 5; int a[n];
In C++, it would result in compile error "constant expression required". You have to declare it using constexpr:
constexpr int n = 5; int a[n];
However, if you for example want to use the size of a vector to declare an array, you can't use the stack, you have to use the heap:
int* a = new int[myVector.size()]; ... delete[] a;
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