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Strange file writing

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Why do I get 3 bytes into the file when I explicitly wrote 2? And why does this only appear if i give num a value of 10? See code below. File data is: '0d 0a 00'. Shouldn't it be: '0a 00'?
// C++ version
ofstream file;

file.open( "file001", ios::out );

unsigned short num = 10;
file.write( (char*)&num, 2 );


// C version

FILE *pFile;

pFile = fopen( "file001", "w" );

unsigned short num = 10;
fwrite( (void*)&num, 2, 1, pFile );

fclose( pFile );

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