How can i prevent class redefinition problem ?

[ankurjain]

hi all,

suppose there are three files a.h,b.h,c.h
which contain classes a,b,c respectively.
and let c.h included in b.h and b.h included in a.h.

//c.h
 
class c
{ ....
};
//b.h
#include c.h
class c
{...
}
//a.h
#include b.h
#include c.h
class a
{...
}

//c.h

class c
{ ....
};
//b.h
#include c.h
class c
{...
}
//a.h
#include b.h
#include c.h
class a
{...
}

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On compiling there comes an error of class redeclaration ..... how can we prevent this ?