By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. At first glance it seems that compiler will give variable redefinition error but program is perfectly valid according to C standard. A tentative definition is any external data declaration that has no storage class specifier and no initializer. My question is, what is rationale for allowing tentative definitions? Is there any use of this in C?

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The Standard

Normative Amendment 1 created a new standard for C in , but only to correct some details of the standard and to add more extensive support for international character sets. The language defined by that version of the standard is commonly referred to as "C99". C99 is, for the most part, backward compatible with C89, but it is stricter in some ways. In particular, a declaration that lacks a type specifier no longer has int implicitly assumed.


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