An overloaded operator declaration $+$ or $+=$ to support a fast transfer of $$40\mathrm{.}00$

from one bank account to another. For example, this operation may be done using

the following code:

accts.at$($dstAcctIndex$)+=$ accts.at$($srcAcctIndex$)$;

where accts is a vector of Account type in my main$()$ function and I am

moving $$40\mathrm{.}00$ from a source account $($denoted by srcAcctIndex$)$ to a

destination account $($denoted by dstAcctIndex$).$ More details on this particular

functionality will be provided in the description of the fast transfer menu function