Is it true that a global variable may have several declarations, but only one definition?

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Umasankar Natarajan

Software Professional Trainer with 26+ years of Experience in Software Design and Development

No. Any variable can be declare only one time within the scope.
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Almost Yes, a global (non static) variable can have several declarations but only one definition, but there can be many global static variables defined across several translation units, and all of them are different .
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For automatic and register variables, there is no difference between definition and declaration. The process of declaring an automatic or a register variable defines the variable name and allocates appropriate memory. However, for external variables, these two operations may occur independently.
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Thanks for the question Moid ...... Yes variables can be declared more than once if it is declared globally by using extern keyword. Thanks, Team DishaaPro www.dishaapro.com
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