if we right like that:

class myClass
{
int a;
string b;
char c;
}

what will be the size of this class?

Use the built-in function sizeof() to get the size of your class in bytes.

// prints out the size of 'myClass' in number of bytes
cout << sizeof(myClass)

uh, not necessarilly. That will give the size in bytes of a single instance of the class, not the "size of the class" whatever that might be (op never gave any indication what he means by the term).

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