CSCI 316: Quiz 7 - Expressions and Assignments
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The main purpose of an expression in a programming language is to:
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Allocate memory
Define scope
Compute a value
Control program flow
Declare variables
An operator is best described as:
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A Boolean literal
A variable that stores a result
A value used in computation
A memory location
A symbol that represents a computation
An operand is:
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A function definition
A type specifier
A symbol such as + or *
A value or variable operated on
A control statement
Operator precedence determines:
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Whether expressions are valid
Whether an operator is unary or binary
The order in which operators are evaluated
The type of the result
Whether short-circuiting occurs
Operator associativity is used when:
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Operators are overloaded
Two operators have the same precedence
Assignments are chained
Expressions contain Boolean values
Operands have different types
In infix notation, operators appear:
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After operands
Between operands
Only at the end of expressions
Before operands
Only with parentheses
Prefix and postfix notation are often easier to evaluate because they:
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Avoid precedence rules
Use Boolean values only
Prevent nesting
Require more memory
Disallow unary operators
Operator overloading allows:
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New operators to be created
An operator symbol to have multiple meanings
Assignments inside expressions
Variables to change type
Automatic memory allocation
A common benefit of operator overloading is:
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Stronger type checking
Improved readability for similar operations
Faster execution
Simpler parsing
Elimination of coercion
Mixed-mode expressions contain:
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Only relational operators
Operands of different data types
Only constants
Only Boolean operands
Only integer operands
Implicit type conversion is also known as:
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Aliasing
Binding
Coercion
Overloading
Casting
A potential problem with implicit coercion is:
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Elimination of type checking
Syntax errors
Reduced execution speed
Loss of precision
Parsing ambiguity
Explicit type conversion usually requires:
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Runtime evaluation only
A special cast syntax
Operator overloading
Short-circuit rules
Multiple assignment
Relational expressions typically produce values of type:
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Integer
Floating point
Character
Boolean
String
Boolean expressions are most commonly used to:
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Store numeric values
Allocate memory
Initialize arrays
Control program execution
Define data types
Short-circuit evaluation means:
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Boolean expressions are forbidden
Operands are evaluated in reverse order
Evaluation stops once the result is known
All operands are always evaluated
Expressions are evaluated at compile time
Short-circuit evaluation is especially useful because it:
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Improves syntax
Forces full evaluation
Prevents unnecessary or unsafe evaluations
Eliminates Boolean types
Simplifies operator precedence
An assignment statement primarily:
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Controls iteration
Defines a type
Declares a variable
Changes the value of a variable
Evaluates Boolean conditions
The left-hand side of an assignment must be:
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An l-value
A Boolean expression
A constant
A function call
An expression with no side effects
An l-value is best defined as:
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A literal constant
An operator result
A temporary computation result
A Boolean condition
A reference to a memory location
A common problem with assignment as an expression is:
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Stricter typing
Hidden side effects
Reduced efficiency
Elimination of Boolean logic
Loss of expressiveness
Multiple assignment allows:
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Assignments without expressions
One variable to be assigned repeatedly
One value to be assigned to several variables
Assignments only at declaration time
Only Boolean values to be assigned
Compound assignment operators such as += are mainly intended to:
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Improve readability and writability
Increase execution speed
Prevent side effects
Eliminate coercion
Change precedence rules
Prefix and postfix increment operators differ in:
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Type conversion rules
Memory allocation
Whether the variable changes value
The value produced by the expression
Operator symbols used
Mixed-mode assignment occurs when:
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Operators are overloaded
Multiple variables appear on the left
The left and right sides have different types
Assignment uses short-circuit logic
Assignment appears inside a Boolean expression
Strong typing improves assignment reliability by:
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Allowing any type combinations
Detecting incompatible assignments
Enabling operator overloading
Reducing execution speed
Eliminating all conversions
Assignment statements are closely tied to the von Neumann architecture because they:
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Require recursion
Use Boolean expressions
Avoid iteration
Model data movement in memory
Represent control flow
Chained assignment (a = b = c) depends on:
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Operator overloading
Assignment returning a value
Left-to-right evaluation
Short-circuit evaluation
Assignment returning no value
Why do some languages forbid assignment inside conditions?
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It prevents Boolean expressions
It avoids confusion with equality testing
It reduces execution speed
It eliminates coercion
It simplifies operator overloading
A deeply nested expression with side effects mainly hurts:
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Compilation speed
Performance
Memory usage
Type safety
Readability
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