Operators in .NET Core

Operators are special symbols that perform operations on one or more values (operands).

Arithmetic Operators

These operators are used for mathematical calculations.

Operator	Name	Description
+	Addition	Adds two operands. Can also be used for string concatenation.
-	Subtraction	Subtracts the right operand from the left operand.
*	Multiplication	Multiplies two operands.
/	Division	Divides the left operand by the right operand.
%	Modulo	Returns the remainder of the division.
++	Increment	Increases the value of an operand by one.
--	Decrement	Decreases the value of an operand by one.

Example:

int a = 10;
int b = 5;
int sum = a + b;       // sum is 15
int difference = a - b; // difference is 5
int product = a * b;   // product is 50
int quotient = a / b;  // quotient is 2
int remainder = a % b; // remainder is 0

Console.WriteLine($"Sum: {sum}");
Console.WriteLine($"Difference: {difference}");
Console.WriteLine($"Product: {product}");
Console.WriteLine($"Quotient: {quotient}");
Console.WriteLine($"Remainder: {remainder}");

a++; // a becomes 11
b--; // b becomes 4
Console.WriteLine($"Incremented a: {a}");
Console.WriteLine($"Decremented b: {b}");
            

Comparison Operators

These operators are used to compare two values.

Operator	Name	Description
==	Equal to	Checks if two operands are equal.
!=	Not equal to	Checks if two operands are not equal.
>	Greater than	Checks if the left operand is greater than the right operand.
<	Less than	Checks if the left operand is less than the right operand.
>=	Greater than or equal to	Checks if the left operand is greater than or equal to the right operand.
<=	Less than or equal to	Checks if the left operand is less than or equal to the right operand.

Example:

int x = 7;
int y = 10;

bool isEqual = (x == y);      // false
bool isNotEqual = (x != y);   // true
bool isGreater = (x > y);     // false
bool isLess = (x < y);        // true

Console.WriteLine($"x == y: {isEqual}");
Console.WriteLine($"x != y: {isNotEqual}");
Console.WriteLine($"x > y: {isGreater}");
Console.WriteLine($"x < y: {isLess}");
            

Logical Operators

These operators are used to combine conditional statements.

Operator	Name	Description
&&	Logical AND	Returns true if both statements are true.
||	Logical OR	Returns true if one of the statements is true.
!	Logical NOT	Reverses the result.

Example:

int age = 25;
bool hasLicense = true;

if (age >= 18 && hasLicense) {
    Console.WriteLine("You are eligible to drive.");
}

bool isSunny = false;
if (!isSunny || age < 30) {
    Console.WriteLine("It's either not sunny, or you are younger than 30.");
}
            

Assignment Operators

These operators are used to assign values to variables.

Operator	Example	Same As
=	c = a	c = a
+=	c += a	c = c + a
-=	c -= a	c = c - a
*=	c *= a	c = c * a
/=	c /= a	c = c / a
%=	c %= a	c = c % a

Other Operators

There are many other operators, including bitwise operators, null-coalescing operators, and conditional (ternary) operators.

• Conditional (Ternary) Operator: condition ? value_if_true : value_if_false
• Null-Coalescing Operator: ?? (Returns the left-hand operand if it's not null; otherwise, returns the right-hand operand.)

Example:

int time = 20;
string timeOfDay = (time < 18) ? "Good day" : "Good evening";
Console.WriteLine(timeOfDay); // Output: Good evening

string name = null;
string displayName = name ?? "Guest";
Console.WriteLine(displayName); // Output: Guest