Type Conversion, Type Aliases and Type Deduction

Question 1

Implicit type conversion

Answer 1

is performed when one one data type is expected, but a different data type is supplied

If the compiler knows how to convert, it will. Otherwise you get a compile error

Question 2

Name three standard conversions

Answer 2

numeric promotion, numeric conversions and arithmetic conversions

Question 3

numeric promotion

Answer 3

is the conversion of smaller numeric types to larger numeric types e.g. int to double

includes integral and floating point promotions

are value preserving

Question 4

value preserving

Answer 4

no loss of value or precision

Question 5

numeric conversion

Answer 5

a type conversion between fundamental types that isn’t a numeric promotion

Question 6

narrowing conversion

Answer 6

type of numeric conversion that may result in the loss of value or precision

Question 7

usual arithmetic conversions

Answer 7

rules applied when operands of different types are provided to binary operators

e.g. 5.5 + 5; => 5.5 + 5.0;

Question 8

explicit type conversion

Answer 8

performed when programmer explicitly requests conversion via a cast

Question 9

2 types of casts you should do in c++

Answer 9

static casts and dynamic casts

Question 10

static cast

Answer 10

it provides compile-time type checking and only allows conversions that are considered safe by the compiler

Question 11

dynamic cast

Answer 11

Another type of casting operator used for casting pointers or references to classes up and down the class inheritance hierarchy.

It’s primarily used for performing safe downcasting (casting from a base class pointer or reference to a derived class pointer or reference) and for performing runtime type checking.

Question 12

typedefs / type aliases
Show code example

Answer 12

allow programmer to create an alias for a data type

e.g. using Degrees = double;

Question 13

auto keyword for type uses

Answer 13

can be used to do type deduction, this drops const and references