If-else execution flow in C Sharp (C#) - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of nested if-else statements

What is the output of this C# code?

C Sharp (C#)

int x = 10;
int y = 20;
if (x > y)
{
    Console.WriteLine("X is greater");
}
else if (x == y)
{
    Console.WriteLine("X equals Y");
}
else
{
    Console.WriteLine("Y is greater");
}

A X is greater

B X equals Y

C Y is greater

D No output

💡 Hint

Compare the values of x and y carefully.

Since x (10) is less than y (20), the else block runs, printing "Y is greater".

❓ Predict Output

intermediate

If-else with boolean conditions

What will this program print?

C Sharp (C#)

bool isRaining = false;
bool haveUmbrella = true;
if (isRaining && haveUmbrella)
{
    Console.WriteLine("Go outside");
}
else
{
    Console.WriteLine("Stay inside");
}

A Stay inside

B Compilation error

C Go outside

D No output

💡 Hint

Both conditions must be true for the first block to run.

isRaining is false, but haveUmbrella is true. The condition isRaining && haveUmbrella is false, so the else block runs, printing "Stay inside".

🔧 Debug

advanced

Identify the error in if-else syntax

Which option contains a syntax error in the if-else structure?

C Sharp (C#)

int number = 5;
if (number > 0)
    Console.WriteLine("Positive");
else
    Console.WriteLine("Non-positive");

A

if (number > 0)
    Console.WriteLine("Positive")
else
    Console.WriteLine("Non-positive");

B

if (number > 0) {
    Console.WriteLine("Positive");
} else {
    Console.WriteLine("Non-positive");
}

C

if (number > 0)
    Console.WriteLine("Positive");
else
    Console.WriteLine("Non-positive");

D

if number > 0 {
    Console.WriteLine("Positive");
} else {
    Console.WriteLine("Non-positive");
}

💡 Hint

Check the syntax for the if statement in C#.

Option D misses parentheses around the condition, which is required in C#. This causes a syntax error.

❓ Predict Output

advanced

Output of if-else with multiple conditions

What does this program print?

C Sharp (C#)

int score = 85;
if (score >= 90)
{
    Console.WriteLine("Grade A");
}
else if (score >= 80)
{
    Console.WriteLine("Grade B");
}
else if (score >= 70)
{
    Console.WriteLine("Grade C");
}
else
{
    Console.WriteLine("Grade F");
}

A Grade F

B Grade B

C Grade C

D Grade A

💡 Hint

Check which condition matches the score first.

The score 85 is not >= 90, so first if fails. The second condition (>= 80) is true, so it prints "Grade B" and skips the rest.

🧠 Conceptual

expert

Understanding if-else execution flow with variable changes

Consider this code snippet. What is the final value of result after execution?

C Sharp (C#)

int x = 5;
int result = 0;
if (x > 3)
{
    result = 10;
    if (x < 10)
    {
        result += 5;
    }
    else
    {
        result += 20;
    }
}
else
{
    result = -10;
}

A 15

B 10

C 20

D -10

💡 Hint

Trace the nested if-else carefully and update result step by step.

Since x is 5, the first if is true, so result becomes 10. Then the nested if checks if x is less than 10, which is true, so 5 is added. Final result is 15.