What is a const function?

If a member function of a class does not alter any data in the class, then this member function may be declared as a constant function using the keyword const.

Consider the following declarations:

int max(int,int) const;
void prn(void) const;

Once a function is declared as const, it cannot alter the data values of the class. The complier will generate an error message if such functions try to change the data value.

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