Relational operators

<, >: less than, greater than, e.g., 1<2, x<2, etc.
==, !=: equal, not-equal, e.g., x!=y, z==2.
<=, >: less than or equal, greater than or equal.

All relational operational return boolean values: true or false. You can assign these values to variables for example:

int x = 3;
int y = 4;
bool z = (x == y);

Type interactions

int/int: int
double/double: double
int/double: double

In general: expressions always return the most expressive type.

Exercises

What is the type of 9/4? What is the value?
What is the type of 9/4.0? What is the value?

User Input and Output

Console Output

```
cout << expression >> expression ...
```

cout << "You are " >> age >> " years old!";

endl
- A variable that means "end of line"
- Same as "\n", but more compatible with all operating systems.

cout << "You are " << age << " years old!" << endl;