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What are the drawbacks of inheritance?

Drawbacks of inheritance :
    * Difficulty of understanding complex hierarchy.
    * Makes writing a compiler harder, e.g. requires more dynamic type checking since type of an object can change during runtime.
    * Adversely affects execution speed, program size, program complexity, and incurs method passing overhead.
    * Inheritance forces a set of methods and fields on a class. You may not want some of these, and it is not necessary that all of these are required. There is no concept of partial inheritance. 
    * Interface stability of base classes sometimes require even more complexity.

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main() { int c[ ]={2.8,3.4,4,6.7,5}; int j,*p=c,*q=c; for(j=0;j<5;j++) { printf(" %d ",*c); ++q; } for(j=0;j<5;j++){ printf(" %d ",*p); ++p; } }
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