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Introduction to the Solidity Programming Language

Logical and Assignment Operators

Explore how to work with logical operators like AND, OR, and NOT to create complex conditions in Solidity. Understand assignment operators to assign and update variable values within your smart contracts efficiently.

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In this lesson, we’ll explore logical and assignment operators. By understanding logical operators, we’ll learn how to create complex conditions by combining boolean values. Simultaneously, we’ll learn assignment operators, simplifying the process of modifying variables.

Logical operators

These operators are used to pair two or more conditions together. The following logical operators are supported by Solidity:

  • AND (&&): This returns true if both criteria are true and false if just one of them is true.

  • OR (||): This returns true when one or both criteria are met and false when both are not.

  • NOT (!): This returns true if the condition is not met. Otherwise, false.

The following code example demonstrates the use of logical operators in Solidity:

Solidity
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;
 
contract OperatorDemo{
 
    // Initializing variables
    bool public first = true;
    bool public second = false;
    
    // Initailize variable with the AND operator result
    bool public and = first&&second;
        
    // Initailize variable with the OR operator result
    bool public or = first||second;
        
    // Initailize variable with the NOT operator result
    bool public not = !second;
}

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