# is a valid Symbol
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include is a valid identifier
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< is a valid Operator
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iostream is a valid identifier
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> is a valid Operator
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using is a valid identifier
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namespace is a valid identifier
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std is a valid identifier
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; is a valid Symbol
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void is a valid Keyword
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main is a valid identifier
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( is a valid Symbol
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) is a valid Symbol
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{ is a valid Symbol
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int is a valid Keyword
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a is a valid identifier
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, is a valid Symbol
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b is a valid identifier
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; is a valid Symbol
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int is a valid Keyword
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c is a valid identifier
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= is a valid Operator
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a is a valid identifier
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+ is a valid Operator
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b is a valid identifier
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; is a valid Symbol
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return is a valid Keyword
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0 is a valid Number
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; is a valid Symbol
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} is a valid Symbol
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