Logical Operators
There are following logical operators supported by C++ language.
Logical operators are used to determine the logic between variables or values:
| Operator | Name | Description | Example |
|---|---|---|---|
| && | Logical and | Returns true if both statements are true | x < 5 && x < 10 |
| || | Logical or | Returns true if one of the statements is true | x < 5 || x < 4 |
| ! | Logical not | Reverse the result, returns false if the result is true | !(x < 5 && x < 10) |
Example
#include <iostream>
using namespace std;
main() {
int a = 5;
int b = 20;
int c ;
if(a && b) {
cout << "Line 1 - Condition is true"<< endl ;
}
if(a || b) {
cout << "Line 2 - Condition is true"<< endl ;
}
/* Let's change the values of a and b */
a = 0;
b = 10;
if(a && b) {
cout << "Line 3 - Condition is true"<< endl ;
} else {
cout << "Line 4 - Condition is not true"<< endl ;
}
if(!(a && b)) {
cout << "Line 5 - Condition is true"<< endl ;
}
return 0;
}
When the above code is compiled and executed, it produces the following result − Line 1 - Condition is true Line 2 - Condition is true Line 4 - Condition is not true Line 5 - Condition is true