a variable may contain any no. of chracters
pen drive,cd or hard disk
there are 5 even digits and 5 odd digits. any of these can occur in their proper places. hence there are 56 ways of selecting 3 even and 3 odd digits for a particular selection of place for even digits. hence we get 20×56 such numbers.
a)variable names must be less .
b)string variables are declared in t...