指针加法运算

指针加法需要调整，调整的权重是指针本身去掉一个*号，再求sizeof();

举例：int *p , p+1 ; 加4 ( sizeof ( int ) * 1) 字节；

            double *p , p+1 ; 加8 ( sizeof ( double ) * 1) 字节；

#include<stdio.h>

int main()

{

        int *p = ( int * ) 10000

        printf ( " %d\n " , p + 1 );          10004

        printf ( " %d\n " , p + 4 );          10016

        printf ( " %d\n " , ( char * ) p + 4 );         10004

        printf ( " %d\n " , ( shart * ) p + 4 );          10008

        printf ( " %d\n " , ( double * ) p + 4 );          10032

        printf ( " %d\n " , ( unsigned  long  long) p + 1 );         10001

        printf ( " %d\n " , ( int *** )p + 1 );         10004

        printf ( " %d\n " , ( double ** )p + 1 );           10004

        printf ( " %d\n " , ( float ** )p + 1 );         10040

        return  0 ;

}