about constructor

[jimmy5023]

let's say
class person has a default constructor that set things to zero.

so if i say
person keith;
then defuallty keith will be sth like (0,0,0,0)

my question is what is
what if class person1 DO NOT have a default constructor?
will person keith; give a syntax error?

[hamsterman]

Every class has a default constructor (that's partly what makes it default) along with a copy constructor and operator =.

[Computergeek01]

You get an "undefined reference" error, the same as you would if you didn't follow the rule of three.