Template:cpp/container/vector/example size

The following code uses size to display the number of elements in a std::vector<int>:

Run this code

#include <cassert>
#include <vector>
 
int main()
{
    std::vector<int> nums;
    assert(nums.size() == 0);
    nums = {1, 2, 3, 4};
    assert(nums.size() == 4);
}