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Calling Function: Calling a function is often
associated with calling other functions. A function terminates
or ends when it encounters a closing brace or "return"
statement.
We can quit a function using exit() function in C
programming
How to Quit main() using exit function of <stdlib.h>
.
We can use return(0) or exit(0) signals for normal
completion of the function.
Usually a non-zero, like return(1) or exit(1) signals
for an error or failure to caller like main().