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1,使用指针方法实现(指针的指向不变)
代码段:
#include<stdio.h> void main() { int a[5] = { 5,6,7,8,9 }, sum = 0, i; int* p =
a;//让p指向a[0]元素 for (i = 0; i < 5; i++) sum+=p[i];//p[i]表示一维数组中第i个元素内容
printf("%d\n", sum); }
样例输出:
35
2, 使用指针方法实现(指针的指向不变)
代码段:
#include<stdio.h> void main() { int a[5] = { 5,6,7,8,9 }, sum = 0, i; int* p =
a; for (i = 0; i < 5; i++) sum +=
*(p+i);//*(p+i)表示一维数组中第i个元素内容,即p指针指向下i个元素,然后再与*结合,取p指针所指向的空间内容 printf("%d\n",
sum); }
样例输出:
35
拓展:
p++ 或者 ++p :让p指针指向下一个元素
*p++ 或者 *(p++) :p先与++结合,即p指针先指向下一个元素,然后再与*结合,取p指针所指向的空间内容
(*p)++ :先取p指针所指向的空间内容作为该表达式的值,然后使得p指针所指向的空间的内容自增1。
++(*p) :先使得p指针所指向的空间的内容自增1,然后取p指针所指向的空间内容作为该表达式的值。
int a[10];
int *p;
p=a; //让p指向a[0]元素
表示一维数组中第0个元素地址: a、 p、 &a[0]
表示一维数组中地0个元素内容: *a、 *p、 a[0]
结论:
表示一维数组中第i个元素地址: a+i、 p+i、 &a[i]
表示一维数组中第i个元素内容:*(a+i)、*(p+i)、 a[i] 、p[i]