Answer Posted / sumit arora

In C++,vectors are used for dynamically allocating space
(run time)as per your need,you do not need to hard code for
eg: consider a <vector> v;
for(int i=0;i<=v.size();i++)
cout<<v[i];

and that size can be increased with v.pushback(element)for
eg.
so there is no need to hard code whatever element you
pushed back only that memory is used.

but in array you do only have a fixed size
for(i=0;i<=100;i++)
cin<<a[i];

and if you want to access a[101] positions also it will
show you a garbage value ,bcoz in array there is no bound
checking and memorywize its a compile time allocation not a
dynamic one.

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