Solidity Local Variables

Logical Operators in Solidity

Last Updated : 24 Apr, 2025

Logical Operators are used to combining two or more conditions. Solidity has the following types of logical operators:

Logical AND: Logical AND takes two operands and gives the valid Boolean result. The logical AND operator evaluates to true when all the operands are true (non-zero) otherwise false(zero). It is denoted by &&.
Logical OR: Logical OR takes two operands and gives the valid Boolean result. The logical OR operator evaluates to true when at least one of the operands is true (non-zero) or otherwise false(zero). It is denoted by ||.
Logical NOT: Logical NOT takes one operand and gives its complement as the result. The logical NOT operator evaluates to true (non-zero) if the operand is false (zero) and vice-versa. It is denoted by !.

Operation	Denotation	Description
Logical AND	&&	It evaluates to true when all the operands are true (non-zero) otherwise false (zero)
Logical OR	\|\|	It evaluates to true when at least one of the operands is true (non-zero) otherwise false (zero)
Logical NOT	!	It evaluates to true (non-zero) if the operand is false (zero) and vice-versa

These logical operators are used to evaluate conditions in different situations.

Below is the Solidity program to implement the Logical Operators:

Solidity

// Solidity program to implement  
// the Logical Operators 
pragma solidity ^0.5.0; 
  
contract logical { 
    
  function logicaloperator (bool a , bool b) public pure returns (bool, bool, bool) { 
    // Logical AND  
    bool logicaland = a && b; 
      
    // Logical OR 
    bool logicalor = a || b; 
      
    // Logical NOT 
    bool logicalnot = !b; 
      
    return (logicaland, logicalor, logicalnot); 
  } 
}

Output: Let us have two Boolean variables a and b.

Case 1: When a is true and b is false.

a is true and b is false

Case 2: When a is false and b is false.

a is false and b is false

Case 3: When a is true and b is true.

a is true and b is true

Case 4: When a is false and b is true.

a is false and b is true

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