What are the difference between global and local variables?

Global Variable

Local Variable

Global Variable is variable which is declared before main function.

Local Variable is variable which is declared inside the main function or other functions.

A global variable can be accessed by all functions.

A local variable is isolated in its function.

It’s working with changing values.

It’s not working with changing values.

Variables treat(use) only one name in program.

Same variable names are working different values in different functions.

They are known to other functions and to the main program.

They are unknown to other functions and to the main program.