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    <p>_tmain is a macro that gets redefined depending on whether or not you compile with Unicode or ASCII. It is a Microsoft extension and isn't guaranteed to work on any other compilers.</p> <p>The correct declaration is</p> <pre><code> int _tmain(int argc, _TCHAR *argv[]) </code></pre> <p>If the macro UNICODE is defined, that expands to</p> <pre><code>int wmain(int argc, wchar_t *argv[]) </code></pre> <p>Otherwise it expands to </p> <pre><code>int main(int argc, char *argv[]) </code></pre> <p>Your definition goes for a bit of each, and (if you have UNICODE defined) will expand to </p> <pre><code> int wmain(int argc, char *argv[]) </code></pre> <p>which is just plain wrong.</p> <p>std::cout works with ASCII characters. You need std::wcout if you are using wide characters.</p> <p>try something like this</p> <pre><code>#include &lt;iostream&gt; #include &lt;tchar.h&gt; #if defined(UNICODE) #define _tcout std::wcout #else #define _tcout std::cout #endif int _tmain(int argc, _TCHAR *argv[]) { _tcout &lt;&lt; _T("There are ") &lt;&lt; argc &lt;&lt; _T(" arguments:") &lt;&lt; std::endl; // Loop through each argument and print its number and value for (int i=0; i&lt;argc; i++) _tcout &lt;&lt; i &lt;&lt; _T(" ") &lt;&lt; argv[i] &lt;&lt; std::endl; return 0; } </code></pre> <p>Or you could just decide in advance whether to use wide or narrow characters. :-)</p> <p><strong>Updated 12 Nov 2013:</strong></p> <p>Changed the traditional "TCHAR" to "_TCHAR" which seems to be the latest fashion. Both work fine.</p> <p><strong>End Update</strong></p>
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    1. POWhat is the difference between _tmain() and main() in C++?
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    1. USMichael J
    1. USMichael J
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    1. CO+1 `_tmain` uses `TCHAR` not `char`.
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      1. USuser7116
    2. CO*"It is a Microsoft extension and won't work on any other compilers."* [Not as far as RAD Studio is concerned.](http://docwiki.embarcadero.com/RADStudio/XE3/en/TCHAR_Mapping)
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      1. USb1nary.atr0phy
    3. CO@b1naryatr0phy - To split hairs, the tool you link to uses "_TCHAR", rather than "TCHAR" so it isn't compatible (though it does falsify my statement). However I should have said "It is a Microsoft extension and isn't guaranteed to work on any other compilers.". I'll amend the original.
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