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    <pre><code>void change_AArray() { *AArray[0] = *((TYPEA*) &amp;gb); //#1 /* error: *(AArray[0]) = (TYPEA) gb; //#2 */ } </code></pre> <p>You can use #1 for your purpose.</p> <p>If use #2, gcc reports an error:<br> error: conversion to non-scalar type requested</p> <p>Questions are:<br> - What's scalar/non-scalar type?<br> - What does this error message mean?<br> - Why #2 fails? </p> <p>What's scalar/non-scalar type?<br> int, char, pointers are scalar type, and a structure is not.<br> See details here,<a href="http://herbert.the-little-red-haired-girl.org/en/prgmsc1/docs/part2a.pdf" rel="nofollow noreferrer">http://herbert.the-little-red-haired-girl.org/en/prgmsc1/docs/part2a.pdf</a></p> <p>What does this error message mean?<br> If you do assignment between scalar and non-scalar type, you'll get this error.</p> <p>Why #2 fails?<br> For <code>*(AArray[0]) = (TYPEA) gb;</code>, both sides are non-scalar types. So, it looks like it shouldn't get the above error.<br> However, C doesn't allow cast between structures. See <a href="http://msdn.microsoft.com/en-us/library/d9f2bsy2.aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/d9f2bsy2.aspx</a>.</p> <p>A test program,</p> <pre><code>struct a{ int i;}; struct b{ int i; }; int main (int argc, char *argv[]) { struct a aaa; struct b bbb; bbb = (struct b)aaa; return 0; } </code></pre> <p>gcc reports an error: <code>error: conversion to non-scalar type requested</code></p> <p>So to conclude, the reason for failure of #2 is that C language doesn't allow cast between structures.</p>
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