C# Comparison Operators

Welcome to The Coding College! In this tutorial, we’ll explore C# Comparison Operators, which are used to compare values in C#. These operators return a Boolean result (true or false), making them essential for conditional statements and decision-making in programming.

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What are Comparison Operators in C#?

Comparison operators in C# are used to compare two values or variables. The result of a comparison is always a Boolean value:

• true (if the condition is satisfied)
• false (if the condition is not satisfied)

These operators are commonly used in:

• Conditional statements like if, else, and switch
• Loops like for, while, and do-while
• Logical operations for decision-making

List of C# Comparison Operators

1. Equal To Operator (==)

The == operator checks if two values are equal. If they are, it returns true; otherwise, it returns false.

Example:

int a = 10;
int b = 10;

if (a == b)
{
    Console.WriteLine("a and b are equal.");
}
else
{
    Console.WriteLine("a and b are not equal.");
}
// Output: a and b are equal.

2. Not Equal To Operator (!=)

The != operator checks if two values are not equal. It returns true if they are different and false if they are equal.

Example:

int a = 10;
int b = 20;

if (a != b)
{
    Console.WriteLine("a and b are not equal.");
}
else
{
    Console.WriteLine("a and b are equal.");
}
// Output: a and b are not equal.

3. Greater Than Operator (>)

The > operator checks if the value on the left is greater than the value on the right.

Example:

int a = 15;
int b = 10;

if (a > b)
{
    Console.WriteLine("a is greater than b.");
}
// Output: a is greater than b.

4. Less Than Operator (<)

The < operator checks if the value on the left is less than the value on the right.

Example:

int a = 5;
int b = 10;

if (a < b)
{
    Console.WriteLine("a is less than b.");
}
// Output: a is less than b.

5. Greater Than or Equal To Operator (>=)

The >= operator checks if the value on the left is greater than or equal to the value on the right.

Example:

int a = 10;
int b = 10;

if (a >= b)
{
    Console.WriteLine("a is greater than or equal to b.");
}
// Output: a is greater than or equal to b.

6. Less Than or Equal To Operator (<=)

The <= operator checks if the value on the left is less than or equal to the value on the right.

Example:

int a = 5;
int b = 10;

if (a <= b)
{
    Console.WriteLine("a is less than or equal to b.");
}
// Output: a is less than or equal to b.

Using Comparison Operators in Conditional Statements

Comparison operators are most commonly used with conditional statements like if and else.

Example:

int age = 18;

if (age >= 18)
{
    Console.WriteLine("You are eligible to vote.");
}
else
{
    Console.WriteLine("You are not eligible to vote.");
}
// Output: You are eligible to vote.

Benefits of Using Comparison Operators

1. Decision-Making: Comparison operators allow your program to make decisions based on conditions.
2. Flexibility: They can be combined with logical operators for more complex conditions.
3. Readability: Simple syntax makes them easy to understand and use.

Practice Problem

Try this small program to practice:

int x = 15;
int y = 20;

if (x == y)
{
    Console.WriteLine("x and y are equal.");
}
else if (x > y)
{
    Console.WriteLine("x is greater than y.");
}
else
{
    Console.WriteLine("x is less than y.");
}

Question: What will be the output when x = 15 and y = 20?

Conclusion

C# Comparison Operators are fundamental tools for comparing values and enabling decision-making in your programs. Mastering these operators will allow you to write logical and efficient code.

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