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int* pNumberOne;
int* pNumberTwo;
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pNumberOne = &some_number;
pNumberTwo = &some_other_number;
¡¡¡¡“&”±êÖ¾Ó¦¸Ã¶Á×÷“the address of£¨……µÄµØÖ·£©”£¬ËüµÄ×÷ÓÃÊÇ·µ»ØÒ»¸ö±äÁ¿µÄÄÚ´æµØÖ·£¬¶ø²»ÊÇÕâ¸ö±äÁ¿±¾Éí¡£ÄÇôÔÚÕâ¸öÀý×ÓÖУ¬pNumberOne¾ÍÊÇsome_numberµÄµØÖ·£¬Òà³Æ×÷pNumberOneÖ¸Ïòsome_number¡£
¡¡¡¡ÏÖÔÚ£¬Èç¹ûÎÒÃÇÏëʹÓÃsome_numberµÄµØÖ·µÄ»°£¬ÄÇôÎÒÃǾͿÉÒÔʹÓÃpNumberOneÁË¡£Èç¹ûÎÒÃÇÏ£Íû¾­ÓÉpNumberOne¶øʹÓÃsome_numberµÄÖµµÄ»°£¬ÎÒÃÇ¿ÉÒÔÓÃ*pNumberOne¡£“*”Ó¦¸Ã¶Á×÷“the memory location pointed to by£¨ÓÉ……Ö¸ÏòµÄÄÚ´æλÖã©”£¬ËüÓÃÀ´È¡µÃÖ¸ÕëËùÖ¸ÏòµÄÖµ¡£²»¹ýÖ¸ÕëÉùÃ÷µÄÇé¿öÀýÍ⣬Èç“int *pNumber”¡£
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#include <stdio.h>
void main()
{
  // ÉùÃ÷±äÁ¿£º
  int nNumber;
  int *pPointer;
  // ÏÖÔÚ£¬¸øËüÃǸ³Öµ£º
  nNumber = 15;
  pPointer = &nNumber;
  // ´òÓ¡nNumberµÄÖµ£º
  printf("nNumber is equal to : %d\n", nNumber);
  // ÏÖÔÚ£¬Í¨¹ýpPointerÀ´¿ØÖÆnNumber£º
  *pPointer = 25;
  // Ö¤Ã÷¾­¹ýÉÏÃæµÄ´úÂëÖ®ºó£¬nNumberµÄÖµÒѾ­¸Ä±äÁË£º
  printf("nNumber is equal to : %d\n", nNumber);
}
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http://www.trendcaller.com/2009/05/hadoop-should-target-cllvm-not-java.html
Sunday, May 10, 2009
Hadoop should target C++/LLVM, not Java (because of watts)
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char *str;
str = malloc(32);
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char ch[3] = "abc";
gcc  -g  -o test test.c
g++ -g -o test test.c
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