memcpy memset

struct STUDENT
{
    char name[20];
  
    int age;
}; 

  int arr1[] = { 1,2,3,4,5,6,7,8,9,10 };
    int arr2[10] = { 0 };
    //使用memcpy()函数将arr1数组的前20字节(即前5个整形)拷进arr2中
    memcpy(arr2, arr1, 20);
    memset(arr2,0,8);
 
    for (int i = 0; i < 10; i++)
        printf("%d\n", arr2[i]);

    

    struct STUDENT person = { "Pierre de Fermat",46 };
    struct STUDENT person_copy = { 0 };
 
    /* 使用memcpy拷贝结构体: */
    memcpy(&person_copy, &person, sizeof(person));
 
    printf("person_copy: %s, %d \n", person_copy.name, person_copy.age);

 

输出结果：

 

0
0
3
4
5
0
0
0
0
0
person_copy: Pierre de Fermat, 46