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#include <stdio.h>
int main( void )
{
     printf( "Hello World!" );
     return 0;
}
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#include <iostream>
using namespace std;
int main( void )
{
     cout << "Hello World!" << endl;
     return 0;
}
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#include <stdio.h>
main()
{ printf( "Hello World!" );
     return 0;}
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3. ΪʲôÊÇreturn 0?
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