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p是一个指针，p++,*p++,(*p)++,*(p++)这四个加到底是加在地址上还是加在值上呢？直接上测试代码我们看：
#define SELPLUS
//#define PLUS
//#define MINUS
//#define MULTIPLY
//#define DIVID
int buf1[5] = { 1, 3, 5, 7, 9};
int buf2[5] = { 1, 3, 5, 7, 9};
int buf3[5] = { 1, 3, 5, 7, 9};
int buf4[5] = { 1, 3, 5, 7, 9};
int *p1 = NULL;
int *p2 = NULL;
int *p3 = NULL;
int *p4 = NULL;
p1 = &buf1[1];
p2 = &buf2[1];
p3 = &buf3[1];
p4 = &buf4[1];
#ifdef SELPLUS
p1++;
*p2++;
(*p3)++;
*(p4++);
#endif
#ifdef PLUS
p1=p1+1;
*p2=*p2+1;
*p3=(*p3)+1;
*p4=*(p4+1);
#endif
#ifdef MINUS
p1=p1-1;
*p2=*p2-1;
*p3=(*p3)-1;
*p4=*(p4-1);
#endif
#ifdef MULTIPLY
*p2=*p2*2;
*p3=(*p3)*2;
#endif
#ifdef DIVID
*p2=*p2/2;
*p3=(*p3)/2;
#endif
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