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Global variable In computer programming, a global variable is a variable with global scope, meaning that it is visible hence accessible throughout the program, unless shadowed. The set of all global variables is known as the global environment or global state..Java syntax A snippet of Java code with keywords highlighted in bold blue font The syntax of Java is the set of rules defining how a Java program is written and interpreted. The syntax is mostly derived from C and C . Unlike C , Java has no global functions or variables, but has data members which are also regarded as global variables..An external variable can be accessed by all the functions in all the modules of a program. It is a global variable. For a function to be able to use the variable, a declaration or the definition of the external variable must lie before the function definition in the source code. Or there must be a declaration of the variable, with the keyword extern, inside the function. The static keyword .The solution is to have errno be a variable that looks as if it is global, but is physically stored in a per thread memory pool, the thread local storage. A second use case would be multiple threads ac.ulating information into a global variable. To avoid a race condition, every access to this global variable would have to be protected by a mutex..
