"declaring vector c++" Code Answer's
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declare vectors c++
vector<int> vec;
//Creates an empty (size 0) vector
vector<int> vec(4);
//Creates a vector with 4 elements.
/*Each element is initialised to zero.
If this were a vector of strings, each
string would be empty. */
vector<int> vec(4, 42);
/*Creates a vector with 4 elements.
Each element is initialised to 42. */
vector<int> vec(4, 42);
vector<int> vec2(vec);
/*The second line creates a new vector, copying each element from the
vec into vec2. */
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