Difference between Local Variable and Global variable Last Updated : 21 Mar, 2024 Comments Improve Suggest changes Like Article Like Report Local variables are declared within a specific block of code, such as a function or method, and have limited scope and lifetime, existing only within that block. Global variables, on the other hand, are declared outside of any function and can be accessed from any part of the program, persisting throughout its execution. Local Variables:Local variables are declared within a specific block of code, such as within a function or a loop.They are only accessible within the block in which they are declared.Once the block of code in which they are declared exits, the memory allocated to these variables is released, and they are no longer accessible.Local variables can have the same name as variables in other blocks without conflict because their scope is limited to the block in which they are declared.They are typically used for temporary storage or only relevant data within a specific context.Global Variables:Global variables are declared outside of any function or block of code, usually at the top of a program or in a separate file.They are accessible from any part of the program, including within functions, loops, or other blocks of code.Global variables retain their value throughout the lifetime of the program unless explicitly modified or reset.Due to their accessibility from anywhere in the program, global variables can introduce unintended side effects and make it harder to understand and debug code, especially in larger programs.They are typically used for values that need to be accessed and modified by multiple parts of the program.Difference between Local Variable and Global variables:AspectLocal VariablesGlobal VariablesScopeLimited to the block of codeAccessible throughout the programDeclarationTypically within functions or specific blocksOutside of any function or blockAccessAccessible only within the block where they are declaredAccessible from any part of the programLifetimeCreated when the block is entered and destroyed when it exitsRetain their value throughout the lifetime of the programName conflictsCan have the same name as variables in other blocksShould be used carefully to avoid unintended side effectsUsageTemporary storage, specific to a block of codeValues that need to be accessed and modified by multiple parts of the program Comment More infoAdvertise with us Next Article Difference between Local Variable and Global variable C code_r Follow Improve Article Tags : DSA Similar Reads Difference between global and local variables in Postman Postman is a powerful API development tool which offers a feature known as environment variables. 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