C Program to Demonstrate global and internal variables.

C Program to Demonstrate global and internal variables.When variable declared outside the all the blocks, they are called global variables, and they are initialized by the system. Variables declared within the functions are called as internal variables, the are locale to that function, and user only initialize the variable. Read more about C Programming Language .

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int counter = 0; /* global because we are outside
all blocks. */
int func(void);

counter++; /* global because it has not been
declared within this block */
printf("counter is %2d before the call to funcn", counter);

func(); /* call a function. */

printf("counter is %2d after the call to funcn", counter);

int func(void)
int counter = 10; /* local. */
printf("counter is %2d within funcn", counter);
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