So far, our conditions have consisted of a single variable whose value is a Boolean, true or false. With the help of operators, we can expand on this and create conditions that utilize multiple values to achieve a Boolean result.

In this exercise, we’ll learn about one particular group of operators in Swift known as comparison operators. Comparison operators determine the relationship between two operands and return a Boolean value as a result.

Swift supports the following comparison operators:

• == Equal to
• != Not Equal to
• > Greater than
• < Less than
• >= Greater than or equal to
• <= Less than or equal to

Comparison operators are most commonly used to compare numerical values such as Integers and Doubles, though == and != can also be used to compare String values.

4 < 5        // true 
0.5 > 0.1    // true
3.5 <= 3.0   // false
12 >= 15     // false
"A" == "A"   // true 
"B" != "b"   // true

Notice how a capital "B" is not equal to a lowercase "b" since Swift is a case sensitive language.

Combining our knowledge of if/else statements and comparison operators, we can construct the following conditional to check for a student’s grade on an exam:

let grade = 95

if grade > 65 {
  print("You passed!") 
} else {
  print("You failed.")
}

Since the student’s grade is greater than 65, the first code block gets executed and prints, You passed! 🎉.