Question

给定一个带有多个元素的struct数组，我想删除，比如元素2，并希望元素3,4,5 ..转移到2,3,4。

在我的下面的代码中，添加和删除功能正常工作。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

如果您的评论显示您想要移动剩余的图书，请添加：

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

^{（未经测试）}

如何在一个struct字符串数组中向下移动元素？

1 个答案: