C# Programming Essentials

What is the default value of an int in C#?

• -1

• 1

• null

• 0

Which data type is used to store a single character in C#?

• string

• float

• int

• char

What keyword is used to define a conditional statement in C#?

• else

• when

• if

• switch

How do you write an if statement in C#?

• if (condition) { // code to execute }

• if condition { // code to execute }

• if (condition) // code to execute

• if { condition } // code to execute

What is the purpose of the else clause in an if-else statement?

• To create a loop that repeats the if condition.

• To execute a block of code when the if condition is true.

• To execute a block of code when the if condition is false.

• To define a function that runs before the if statement.

Can you nest if statements in C#? Give an example.

• if (condition1) { if (condition2) { // Code to execute if condition1 is false } }

• Example: if (condition1) { if (condition2) { // Code to execute if both condition1 and condition2 are true } }

• if (condition1) { // Code to execute }

• if (condition1 && condition2) { // Code to execute if either condition is true }

What is the syntax for a switch statement in C#?

• switch (variable) { case value1: // code block; break; case value2: // code block; break; default: // code block; }

• switch: variable { case value1: // code block; }

• switch (variable) case value1: // code block; break;

• switch variable { case value1: // code block; }

How does a switch statement differ from an if-else statement?

• A switch statement requires all cases to be unique, whereas if-else statements can have duplicate conditions.

• A switch statement matches a single expression against multiple cases, while an if-else statement evaluates conditions sequentially.

• A switch statement executes all cases sequentially, while an if-else statement stops at the first true condition.

• A switch statement can only evaluate boolean expressions, while an if-else statement can evaluate any expression.

What will be the output of the following code: int x = 10; if (x > 5) { Console.WriteLine("Greater"); }?

• Greater

• Not Greater

• Less

• Equal

What is the result of the following code: int y = 3; if (y < 2) { Console.WriteLine("Low"); } else if (y < 5) { Console.WriteLine("Medium"); } else { Console.WriteLine("High"); }?

• Undefined

• High

• Medium

• Low