StackOverflow2013

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8125257
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2011-11-14T17:06:36.573
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2011-11-14T17:06:36.573
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8124682
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2
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Continuing on from your comment: "can you please elaborate on the forward declarations"... Forward declarations are exactly what they sound like. A declaration that will, elsewhere (usually later) be defined. This concept only applies to global symbols. There can only be ONE definition of a global symbol within a resulting binary. You can, however, declare them over and over again within the source code so that they can be referenced during the compile phase. These symbols become definitions in assembly which are then later used in to link everything together during the linking phase. Header files are a common use examples of forward declarations that are defined elsewhere (later) in the code. Local (automatic) variables do not get converted to symbols. So when you say something like <pre><code>int x; int x; </code></pre> within the same scope the compiler disallows it because it is nonsensical. Local variables are simply a convenience to point to a particular location within the function's stack frame. Their definition boundary is within scope markers <code>{</code> <code>}</code>. Header files are essentially "forward declarations" of global variables and functions; to see this for your as in <code>struct foo;</code>. If you would like to see the global definition cause errors try. <code>int x = 10;</code> <code>int x = 11;</code> as a global, and you'll see the compiler spit out an error to the effect "redifintion of x".
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1. POError : Redeclaration with no linkage
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1. PTAnswer
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1. USAhmed Masud
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