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Questions and Answers
The $String$ class is the base class for all data types in C#.
The $String$ class is the base class for all data types in C#.
False (B)
In C#, a variable name can start with a digit.
In C#, a variable name can start with a digit.
False (B)
In C#, the $int$ keyword is used to declare a variable of type $String$.
In C#, the $int$ keyword is used to declare a variable of type $String$.
False (B)
Operators in C# are used to perform operations on variables and data types.
Operators in C# are used to perform operations on variables and data types.
In C#, compile-time initialization is a way to assign a value to a variable at runtime.
In C#, compile-time initialization is a way to assign a value to a variable at runtime.
A variable in C# can be declared without assigning a value to it.
A variable in C# can be declared without assigning a value to it.
In C#, the logical operator AND has a higher precedence than the logical operator OR.
In C#, the logical operator AND has a higher precedence than the logical operator OR.
The arithmetic operator % is used for exponentiation in C#.
The arithmetic operator % is used for exponentiation in C#.
In C#, the relational operator == is used to assign a value to a variable.
In C#, the relational operator == is used to assign a value to a variable.
The unary operator ! is used to perform a logical NOT operation in C#.
The unary operator ! is used to perform a logical NOT operation in C#.
In C#, a single-line comment starts with a double apostrophe ''.
In C#, a single-line comment starts with a double apostrophe ''.
The if-else statement in C# is used to execute a block of code if the given condition is false.
The if-else statement in C# is used to execute a block of code if the given condition is false.
In C#, a switch statement can be used to replace an if-else statement.
In C#, a switch statement can be used to replace an if-else statement.
In a do/while loop, the condition is checked before the code block is executed.
In a do/while loop, the condition is checked before the code block is executed.
A for loop is used when the exact number of iterations is unknown.
A for loop is used when the exact number of iterations is unknown.
In an if-else statement, the code inside the else block is executed if the expression is evaluated to true.
In an if-else statement, the code inside the else block is executed if the expression is evaluated to true.
The code inside an if block is executed as soon as the test expression is false.
The code inside an if block is executed as soon as the test expression is false.
A while loop and a do/while loop are interchangeable in C#.
A while loop and a do/while loop are interchangeable in C#.
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Study Notes
C# Basics
- In C#,
stringandStringare equivalent, and they represent a sequence of Unicode characters. System.Stringis the type name forstring.
Object Class
- The
Objectclass is the base class for all data types in C#. - All types, predefined and user-defined, reference types and value types, inherit directly or indirectly from
Object. - Type conversion is needed before assigning values to an
Object.
Variables
- A variable declaration consists of
type variable_name = value; - The
typedefines the type of information to be stored in the variable. - The
variable_namemust be a valid identifier. - The
valueis the actual data to be stored in the variable.
Naming Variables
- Variable names can contain letters ‘a-z’ or ’A-Z’, digits 0-9, and the character ‘_’.
- Variable names cannot start with a digit.
- Variable names cannot be C# keywords (e.g.
int,float,null,String, etc.).
Initializing Variables
- Initialization means assigning a value to a variable.
- There are two ways to initialize variables: Run Time Initialization and Compile Time Initialization.
Operators
- Operators are used to perform operations on variables and values.
- There are various types of operators in C#, including Arithmetic, Relational, Logical, and Unary operators.
Arithmetic Operators
- Arithmetic operators are used to perform arithmetic operations (e.g. addition, subtraction, multiplication, division, etc.).
Relational Operators
- Relational operators are used in decision making and loops.
- They are used to compare values and return a Boolean value.
Logical Operators
- Logical operators are used to perform logical operations (e.g. AND, OR).
- They operate on Boolean expressions and return a Boolean value.
Unary Operators
- Unary operators operate on a single operand.
Comments
- Single Line Comments start with a double slash
//. - Multi Line Comments start with
/*and end with*/.
Decision Making
ifstatements execute a block of code if a condition is true.if-elsestatements execute a block of code if a condition is true, otherwise execute another block of code.if-else-ifstatements execute a block of code if a condition is true, otherwise check another condition.switchstatements are used to replaceif-elsestatements.
Loops
whileloops execute a block of code as long as a condition is true.do/whileloops execute a block of code once, then check the condition, and repeat if true.forloops execute a block of code for a specified number of iterations.
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