Logical Operators are used in conditional statements and loops for evaluating a condition with binary values. They are used to combine two different expressions together.
The following are the C++ Logical Operators. Assume X holds the value 1 and Y holds 0
| Operator | Description | Example |
| && (logical and) | If both the operands are non-zero, then the condition becomes true. | (X && Y) is false |
| || (logical or) | If any of the two operands are non-zero, then the condition becomes true. | (X || Y) is true |
| ! (logical not) | Use to reverses the logical state of its operand. If a condition is true then Logical NOT operator will make false. | !(X && Y) is true |
C++ program for Logical Operators
Let us see the following example to understand logical operators better.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | #include <iostream> using namespace std; int main() { int a = 7, b = 3, c = 8, d = 6; //both the condition has to be true if (a == b && c > d) cout << "a equals to b AND c is greater than d, TRUE\n"; else cout << "AND operation is FALSE\n"; //any one the condition has to be true if (a == b || c > d) cout << "a equals to b OR c is greater than d, TRUE\n"; else cout << "OR operation is FALSE\n"; if (!b) cout << "b is zero\n"; else cout << "b is not zero"; return 0; } |
Output:
1 2 3 | AND operation is FALSE a equals to b OR c is greater than d, TRUE b is not zero |