16 Questions
Variables can hold more than one value at a time.
False
Assignment requires at least two statements.
True
Initialization is the process of assigning a value to a variable after it has been defined.
False
There are only three ways to initialize variables in C++.
False
Default initialization occurs when an initializer is provided.
False
The = operator is called the assignment operator.
True
Variables must be initialized when they are defined.
False
The value on the right-hand side of the = operator is copied to the variable on the left-hand side.
True
Default initialization always performs some initialization and leaves a variable with a determinate value.
False
Copy initialization is a form of initialization that makes use of curly braces.
False
Direct initialization is used to initialize complex objects with class types.
True
List initialization is also known as 'uniform initialization' or 'brace initialization'.
True
List initialization has the benefit of allowing 'narrowing conversions'.
False
C++17 introduced a new form of initialization called 'list initialization'.
False
Copy initialization is the most efficient form of initialization for all types.
False
Direct initialization is never used in modern C++ due to its inefficiency.
False
Study Notes
Variable Assignment
- The
=operator is used to assign a value to a variable in a separate statement, a process called assignment or copy assignment. - The value on the right-hand side of the
=operator is copied to the variable on the left-hand side. - Assignment overwrites the previous value of the variable.
Initialization
- Initialization is the process of specifying an initial value for an object when it is defined.
- Initialization combines the definition and assignment of a variable into one step.
- The syntax used to initialize an object is called an initializer.
Forms of Initialization
- There are six basic ways to initialize variables in C++.
- Default initialization: no initializer is provided, leaving the variable with an indeterminate value.
- Copy initialization: an initial value is provided after an equals sign, copying the value into the variable.
- Direct initialization: an initial value is provided inside parentheses, initially used for efficient initialization of complex objects.
- List initialization: the modern way to initialize objects using curly braces, with added benefits such as preventing "narrowing conversions".
Key Points
- Normal variables can only hold one value at a time.
- Initialization can be combined with definition, saving a separate assignment step.
- Initializing a variable with a value overwrites any previous value.
Learn how to assign values to variables in programming, including assigning a single integer variable and multiple variables.
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