Object Oriented Programming with C++, Second Edition

3.5 FUNCTIONS WITH DEFAULT ARGUMENTS

C++ supports functions with default arguments. When we define a function, it is possible to define initial values for parameters. Consider function increment. If we want to write function increment to increase the value of a variable by any other value, we can define the function increment as:

void inc(int &x, int y)    { x = x + y ;    };

This will increment variable x by value y. However, most of the time in programming we have to increment value by 1. If we pass the value 1 as a default value to parameter y, the function can be redefined as follows:

void inc(int &x, int y=1)    {x = x + y};

If we call function as inc(marks,5) ;

Variable marks will be incremented by 5. If we call inc(marks); Variables marks ...