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This line is
necessary
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because the
return type of
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main is int (see above).
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We'll talk more
about
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functions and
return types
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later, but for
now
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understand that
because
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the function's
return type is
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int, the function must
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return an int
(integer). To
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return 0 (which
is an
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integer, we
simply write
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return 0;.
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