如何在结构字符串数组中向下移动元素？ [复制]

Question

给定一个包含多个元素的 struct 数组，我想删除元素 2，并希望元素 3、4、5.. 转移到 2、3、4。

在我下面的代码中，添加和删除功能可以正常工作。我尝试过使用 strcpy() 函数，但它没有用。

    struct Books {
        char title[20];
        char author[20];
    };

void add_book(struct Books book1[], int *counter){

    fflush(stdin);
    printf("Title: ");
    gets(book1[*counter].title);
    printf("Author: ");
    gets(book1[*counter].author);
    *counter++;

    return;
}

void delete_book(struct Books book1[], int *counter){

    int i = 0;
    int delete = 0;
    printf("What nr of book you want to delete: ");
    scanf("%d", &delete);

    book1[delete-1].title[0] = '\0';
    book1[delete-1].author[0] = '\0';
    *counter--;

    /*
     here I want to move elements down one step if I delete for example one 
     element in the middle
    */
    return;
}

int main(){

    struct Books book1[50];
    int count = 0; //for keeping track of how many books in the register

    add_book(book1, &count);
    delete_book(book1, &count);

    return 0;
}

Answer 1

在您的 cmets 说您要向下移动剩余书籍时，添加：

    memmove(&book1[delete-1],  &book1[delete], (*counter-delete)*sizeof(struct Books);
    *counter--;  // better to decrement it here

^{（未测试）}