C# Operator

In C#, operators are special symbols or keywords that are used to perform operations on variables and values. Operators are an essential part of C# programming, enabling developers to manipulate data and variables efficiently.

An operator in C# performs specific mathematical, logical, or bitwise operations, such as addition, subtraction, comparison, and more. They work with operands (variables, values, or expressions) to produce a result.

Every programming language uses operators, through which we can perform different actions on the data.

Operators allow the processing of primitive data types and objects. They take as input one or more operands and return some value as a result.

1. Arithmetic Operators

These operators are used for performing basic mathematical operations.

Example:

int a = 20;
int b = 5;
Console.WriteLine(a + b);  // Output: 25 (Addition)
Console.WriteLine(a - b);  // Output: 15 (Subtraction)
Console.WriteLine(a * b);  // Output: 100 (Multiplication)
Console.WriteLine(a / b);  // Output: 4  (Division)
Console.WriteLine(a % b);  // Output: 0  (Remainder)

Note:

1. When dividing two integers (int type), C# performs integer division and discards any fractional part.
2. To get a floating-point result, one of the operands must be a floating-point type (e.g., double or float).

2. Relational (Comparison) Operators

These operators are used to compare two values. They return a boolean value (true or false).

Example:

int a = 20;
int b = 5;
Console.WriteLine(a == b);  // Output: false
Console.WriteLine(a != b);  // Output: true
Console.WriteLine(a > b);  // Output: true
Console.WriteLine(a < b);  // Output: false
Console.WriteLine(a >= b);  // Output: true
Console.WriteLine(a <= b);  // Output: false

3. Logical Operators

Logical operators are used to combine conditional statements.

Example:

bool a = true;
bool b = false;

Console.WriteLine(a && b);  // Output: False (Both must be true)
Console.WriteLine(a || b);  // Output: True (At least one is true)
Console.WriteLine(!a);      // Output: False (Reverses the value)

4. Assignment Operators

These are used to assign values to variables. Some assignment operators combine arithmetic operations with assignment.

Example:

int a = 20;
a += 10;  // a = a + 10 => num = 30
a -= 5;  // a = a - 5 => a = 25
a *= 2;  // a = a * 2 => a = 50
a /= 5;  // a = a / 5 => a = 10

Console.WriteLine(a);  // Output: 10

5. Ternary Operator

This is a shorthand for an if-else statement.

Syntax:

condition ? expression_if_true : expression_if_false

Example:

int age = 19;
string result = (age >= 18) ? 'Adult': 'Not Adult';
Console.WriteLine(result);  // Output: Adult

6. Unary Operators

These operators operate on a single operand.

Example:

int x = 20;
Console.WriteLine(++x);  // Output: 21 (Pre-increment)
Console.WriteLine(x++);  // Output: 21 (Post-increment)
Console.WriteLine(x);    // Output: 22 (x is now 22)

C# Operator – Interview Questions

C# Operator – Objective Questions (MCQs)

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