Operator precedence and evaluation order in C Sharp (C#) - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of mixed arithmetic and logical operators

What is the output of the following C# code snippet?

C Sharp (C#)

int a = 5;
int b = 3;
bool result = a > 2 && b < 5 || a == 5;
Console.WriteLine(result);

A False

B True

C Compilation error

D Runtime exception

💡 Hint

Remember that && has higher precedence than || in C#.

The expression evaluates as (a > 2 && b < 5) || a == 5. Both a > 2 and b < 5 are true, so the left side is true. The right side a == 5 is also true. True || True is True.

❓ Predict Output

intermediate

Result of combined increment operators

What is the value of variable x after executing this code?

C Sharp (C#)

int x = 3;
int y = x++ + ++x;
// What is the value of x now?
Console.WriteLine(x);

A 5

B 6

C 3

D 4

💡 Hint

Remember how postfix and prefix increments work and their evaluation order.

x starts at 3. x++ uses 3 then increments to 4. ++x increments to 5 then uses 5. So y = 3 + 5 = 8. After this, x is 5.

❓ Predict Output

advanced

Output of bitwise and logical operators combined

What is the output of this code snippet?

C Sharp (C#)

int a = 6; // binary 0110
int b = 3; // binary 0011
bool result = (a & b) > 0 && (a | b) < 10;
Console.WriteLine(result);

A Runtime exception

B False

C Compilation error

D True

💡 Hint

Bitwise & and | have lower precedence than comparison operators.

a & b = 2 (binary 0010), which is > 0 (true). a | b = 7 (binary 0111), which is < 10 (true). True && True is True.

❓ Predict Output

advanced

Value of variable after complex expression with ternary and arithmetic

What is the value of z after running this code?

C Sharp (C#)

int x = 4;
int y = 2;
int z = x > y ? x++ * 2 : y++ * 3;
Console.WriteLine(z);

A 8

B 9

C 6

D 10

💡 Hint

The ternary operator evaluates only one branch. Postfix increment happens after the value is used.

x > y is true (4 > 2). So z = x++ * 2 = 4 * 2 = 8. After this, x becomes 5.

❓ Predict Output

expert

Output of expression with mixed assignment and logical operators

What is the output of this code?

C Sharp (C#)

bool a = false;
bool b = true;
bool c = a = b || a && !b;
Console.WriteLine(c);

A Compilation error

B False

C True

D Runtime exception

💡 Hint

Remember operator precedence: && before ||, and assignment is right to left.

Evaluate a && !b first: false && false = false. Then b || false = true || false = true. Then a = true, so c = true.