*(target2+i)和*target2+i

*比+优先级更高。

写CPP 10.2练习时

#include <stdio.h>#include <stdlib.h>void copy_arr(double [],double [],int);void copy_ptr(double *,double *,int);int main(){    int i,n=5;    double  source [5]={1.1,  2.2,  3.3,  4.4,  5.5};    double  targetl [5]={0};    double  target2 [5]={0};    copy_arr (source, targetl, 5);    copy_ptr (source, target2, 5);    printf("*(target2+i)) array is");    for(i=0;i<n;i++)    {        printf(" %0.1f ",*(target2+i));    }    printf("\n");    printf("target2[i] array is");    for(i=0;i<n;i++)    {        printf(" %0.1f ",target2[i]);    }    printf("\n");    printf("target2+i array is");    for(i=0;i<n;i++)    {        printf(" %0.1f ",*target2+i);    }    printf("\n");    system("pause");}void copy_arr(double ar1[],double ar2[],int n){    int i;    printf("Here is copy_arr.\n");    printf("Source array is");    for(i=0;i<n;i++)    {        printf(" %0.1f ",ar1[i]);    }    printf("\n");    printf("Now target1 array is");    for(i=0;i<n;i++)    {        ar2[i]=ar1[i];        printf(" %0.1f ",ar2[i]);    }    printf("\n");}void copy_ptr(double * p1, double * ptr2, int n){    int i;    printf("Here is copy_ptr.\n");    printf("Source array is");    for(i=0;i<n;i++)    {        printf(" %g ",* p1+i);    }    printf("\n");    printf("Now target2 array is");    for(i=0;i<n;i++)    {        *( ptr2 + i )= *( p1 +i);        printf(" %g ",* ptr2 + i );    }    printf("\n");}

出现错误

数组ar[]输出和*target2+i输出不一样，原来*target2+i是先取target的值，然后加1。