# C++ If ... Else

## C++ Conditions and If Statements

C++ supports the usual logical conditions from mathematics:

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

You can use these conditions to perform different actions for different decisions.

C++ has the following conditional statements:

• Use `if` to specify a block of code to be executed, if a specified condition is true
• Use `else` to specify a block of code to be executed, if the same condition is false
• Use `else if` to specify a new condition to test, if the first condition is false
• Use `switch` to specify many alternative blocks of code to be executed

## The if Statement

Use the `if` statement to specify a block of C++ code to be executed if a condition is `true`.

### Syntax

if (condition) {
// block of code to be executed if the condition is true
}

Note that `if` is in lowercase letters. Uppercase letters (If or IF) will generate an error.

In the example below, we test two values to find out if 20 is greater than 18. If the condition is `true`, print some text:

### Example

if (20 > 18) {
cout << "20 is greater than 18";
}
Try it Yourself »

We can also test variables:

### Example

int x = 20;
int y = 18;
if (x > y) {
cout << "x is greater than y";
}
Try it Yourself »

#### Example explained

In the example above we use two variables, x and y, to test whether x is greater than y (using the `>` operator). As x is 20, and y is 18, and we know that 20 is greater than 18, we print to the screen that "x is greater than y".

## Exercise:

Print "Hello World" if `x` is greater than `y`.

```int x = 50;
int y = 10;
(x  y) {
cout << "Hello World";
}
```

Start the Exercise