指针专栏

int* a;     int *a;

数据类型* a;   数据类型 *a;

两者相同

void  test()

{

    int a;

    a=10;       // 完整的  a=(int) 10;

}

对比

void  test2()

{

    int* a;

    char***** b;

    a=(int*)10;

    b=(char*****)20;   // 只能用完整的形式

}

void test()

{

    char* a;

    short* b;

    int* c;

    char** a1;

    short* b1;

    int* c1;

    a=(char*)10;

    b=(short*)10;

    c=(int*)10;

    a1=(char*)10;

    b1=(short*)10;

    c1=(int*)10;

    a++;

    b++;

    c++;

    a1++;

    b1++;

    c1++;

    printf("%d %d %d %d %d %d %d",a,b,c,a1,b1,c1)

        //a+1  b+2 c+4  a1+4  b1+4 c1+4

}

void test()

{

    char* a;

    short* b;

    int* c;

    a=(char*)10;

    b=(short*)10;

    c=(int*)10;

    a=a+5;

    b=b+5;

    c=c+5;

    printf("%d %d %d",a,b,c)  //a+5  b+10  c+10

}

void test()

{

    short* a;

    short* b;

    a=(short*)200;

    b=(short*)100;

    int x=a-b;   //ab 类型必须严格相同，"*" 数量不同也不行

    printf("%d",x)   //x=50

}

void test1()

{

    short** a;

    short** b;

    a=(short**)200;

    b=(short**)100;

    int x=a-b;   // 指针减完之后会变为 int 型不再是指针类型

    printf("%d",x)   //x=25

}

void test()

{

    short* a;

    short* b;

    a=(short*)200;

    b=(short*)100;

    if(a>b)

    {

        printf("1");

    }

    if(b>a)

    {

        printf("0");

    }

}

void test()

{

    char* a;

    int* b;

    a=(char*)10;

    b=(int*)a;

}