A Boolean expression is a C++ expression that returns a boolean value: 1 (true) or 0 (false).
You can use a comparison operator, such as the greater than (>) operator to find out if an expression (or a variable) is true:
Example
int x = 10;
int y = 9;
cout << (x > y); // returns 1 (true), because 10 is higher than 9
int y = 9;
cout << (x > y); // returns 1 (true), because 10 is higher than 9
Or even easier:
Example
cout << (10 > 9); // returns 1 (true), because 10 is higher than 9
In the examples below, we use the equal to (==) operator to evaluate an expression:
Example
int x = 10;
cout << (x == 10); // returns 1 (true), because the value of x is equal to 10
cout << (x == 10); // returns 1 (true), because the value of x is equal to 10
Example
cout << (10 == 15); // returns 0 (false), because 10 is not equal to 15
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