Question

When a called function is not allowed to modify the parameters, this semantics is known as
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Answer 1

Answer:

Default arguments are only allowed in the parameter lists of function declarations and lambda-expressions, (since C++14) and are not allowed in the declarations of pointers to functions, references to functions, or in typedef declarations. Template parameter lists use similar syntax for their default template arguments.

For non-template functions, default arguments can be added to a function that was already declared if the function is redeclared in the same scope. At the point of a function call, the defaults are a union of the defaults provided in all visible declarations for the function. A redeclaration cannot introduce a default for an argument for which a default is already visible (even if the value is the same). A re-declaration in an inner scope does not acquire the default arguments from outer scopes.

Explanation:

Answer 2

Answer:

pass by value:-

passing the parameters by value makes copy of the values into new variables and hence doesn't effect the actual variable from which the function is called .