C Logical Operators
Logical Operators
As with comparison operators, you can also test for true or false values with logical operators.
Logical operators are used to determine the logic between variables or values, by combining multiple conditions:
| Operator | Name | Example | Description | Try it |
|---|---|---|---|---|
| && | AND | x < 5 && x < 10 | Returns 1 if both statements are true | Try it » |
| || | OR | x < 5 || x < 4 | Returns 1 if one of the statements is true | Try it » |
| ! | NOT | !(x < 5 && x < 10) | Reverse the result, returns 0 if the result is 1 | Try it » |
Real-Life Example: Login Check
The example below shows how logical operators can be used in a real situation, e.g. when checking login status and access rights:
Example
bool isLoggedIn = true;
bool isAdmin = false;
printf("Regular user: %s\n", (isLoggedIn && !isAdmin) ? "true" : "false");
printf("Has access: %s\n", (isLoggedIn || isAdmin) ? "true" : "false");
printf("Not logged in: %s\n", (!isLoggedIn) ? "true" : "false");
Result:
Regular user: true
Has access: true
Not logged in: false
