how to examine the value in this compicated class

["lin q" <linq936 at hotmail dot com>]

Hi,
 I am new to gdb, in using print and display commands I can easily examine 
the value of simple data type. But how about this one:

class C2;

class C1{
  char* s1;
  C2* c2;
};

class C2{
  char* s2;
};

 Let's say in the code  there is a variable, c1, whose type is C1*. Then in 
GDB how I can check the value of c1->c2->s2?

Thanks?

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