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The behavior is undefined<br />
<a href="http://www.opengroup.org/onlinepubs/000095399/functions/strcpy.html" rel="ugc">http://www.opengroup.org/onlinepubs/000095399/functions/strcpy.html</a><br />
If copying takes place between objects that overlap, the behavior is undefined.<br />

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The behavior is undefined
http://www.opengroup.org/onlinepubs/000095399/functions/strcpy.html [http://www.opengroup.org/onlinepubs/000095399/functions/strcpy.html]
If copying takes place between objects that overlap, the behavior is undefined.


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Then, how can we shift the sub-string &quot;defg&quot; &nbsp;in char s[100]={'a','b','c','d','e<wbr />','f','g'}<wbr />?<br />

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Then, how can we shift the sub-string "defg"  in char s[100]={'a','b','c','d','e','f','g'}?


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<div class="content wysiwyg-content">
void main()<br />
{<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;char s[100]={'a','b','c','d','e<wbr />','f','g'}<wbr />;<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;strcpy(s+4,s+3);<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;cout&lt;&lt;s&lt;&lt;endl;<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return;<br />
}<br />
I thought it should be abcddefg, but it is abcdddfg. Can you explain in detail?
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void main()
{
	char s[100]={'a','b','c','d','e','f','g'};
	strcpy(s+4,s+3);
	cout<<s<<endl;
	return;
}
I thought it should be abcddefg, but it is abcdddfg. Can you explain in detail?

C++ strcpy

Microsoft Visual C++ (often abbreviated as MSVC or VC++) is an integrated development environment (IDE) product from Microsoft for the C, C++, and C++/CLI programming languages. It features tools for developing and debugging C++ code, especially code written for the Microsoft Windows API, the DirectX API, and the Microsoft .NET Framework. Many applications require redistributable Visual C++ packages to function correctly and are often installed independently of applications, allowing multiple applications to make use of the package while only having to install it once

Visual C++.NET

C is a general-purpose, imperative computer programming language, supporting structured programming, lexical variable scope and recursion, while a static type system prevents many unintended operations. By design, C provides constructs that map efficiently to typical machine instructions, so it has found lasting use in applications that had formerly been coded in assembly language, including operating systems as well as various application software for computers ranging from supercomputers to embedded systems. It is distinct from C++ (which has its roots in C) and C#, and many later languages have borrowed directly or indirectly from C.