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#include <iostream>
using namespace std;
 
int main(void) {
    cout << "Can You Feel My World？" ;
 
    return 0;
}

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C:\g++ main.cpp -O3 -o hello

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Microsoft Windows XP [版本 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
 
C:\Documents and Settings\Sungo>cd\
 
C:\>g++ main.cpp -O3 -o hello
 
C:\>hello
Can You Feel My World？
C:\>

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all:
    g++  main.cpp -g -o run

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make -k all 
g++  main.cpp -g -o run