Const Functions in C++

The Const member functions are used to prevent modifications of class data members within it.Likewise,the const parameters are used to prevent modification of data collected by them.

class sample
     int i;
               int fun() const
                      i=82;   //error
                      return i;
               void fun1(const int &ii)
                      ii=8;    //error
void main()
      sample s;
      int p=9;;

Here fun() is a const member function.Hence ,compiler flashes an error when we try to modify the data member i.Similarly,the function fun1() cannot modify the value of ii as ii is declared as const.

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