Default Arguments in C++
A default argument is a value provided in a function declaration that is automatically assigned by the compiler if the caller of the function doesn’t provide a value for the argument with a default value.
Default arguments are different from constant arguments as constant arguments can't be changed whereas default arguments can be overwritten if required.
Default arguments are overwritten when the calling function provides values for them.
During calling of function, arguments from calling function to called function are copied from left to right.
Once the default value is used for an argument in the function definition, all subsequent arguments to it must have a default value. It can also be stated as default arguments are assigned from right to left.
