C语言 2D 动态结构数组无法按预期工作

Question

所以，我有一个二维结构数组。我逐个元素输入结构，但程序打印一些随机数据，而不是输入的信息。例如，ptr[0][0].Flat_ID应该是 101，但它打印8，至于其他元素，它完全是胡言乱语。知道为什么这样做吗？ 结构：

typedef struct
{
int Flat_ID;
int count_Rooms;
int count_Adults;
int count_Children;
char Family_Surname[20];
char Date[15];
float rent;
}S_Apartament;

里面的程序main()：

int floors=1, flats_per_floor=2;
S_Apartament Flats;
S_Apartament **ptr = (S_Apartament **)malloc(sizeof(S_Apartament*) * floors);//Declaring an array of pointers. It has to be dynamic, as per the assignment
if(ptr == NULL)
{
printf("Memory fail");
free(ptr);
exit(8);
}
for (int i = 0; i <  floors; i++)
{
ptr[i] = (S_Apartament *)malloc(sizeof(S_Apartament)*flats_per_floor);//Each pointer from the first array now is an array of its own, with elements being structures
if(ptr[i] == NULL)
{
printf("Memory fail");
free(ptr);
exit(8);
}
}
for(int i = 0; i <  floors; i++)
{
for(int j = 0; j < flats_per_floor; j++)
{
printf("ID:n");
scanf("%d", &ptr[i][j].Flat_ID);
printf("n");
printf("Rooms:n");
scanf("%d", &ptr[i][j].count_Rooms);
printf("n");
printf("Adults:n");
scanf("%d", &ptr[i][j].count_Adults);
printf("n");
printf("Children:n");
scanf("%d", &ptr[i][j].count_Children);
printf("n");
printf("Name:n");
scanf("%s", ptr[i][j].Family_Surname);
printf("n");
printf("Date of entry: n");
scanf("%s", ptr[i][j].Date);
printf("n");
printf("Rent:n");
scanf("%f", &ptr[i][j].rent);
printf("n");
ptr[i][j]=Flats;
}
}
for(int i=0; i< floors; i++)//Prints read information
{
for(int j=0; j< flats_per_floor; j++)
{
printf("ID: %dn", ptr[i][j].Flat_ID);
printf("Rooms: %dn", ptr[i][j].count_Rooms);
printf("Adults: %dn", ptr[i][j].count_Adults);
printf("Children: %dn", ptr[i][j].count_Children);
printf("Name: %sn", ptr[i][j].Family_Surname);
printf("Date of entry: %sn", ptr[i][j].Date);
printf("Rent: %0.2fn", ptr[i][j].rent);
}
printf("-----------------");
printf("n");
}
free(ptr);

下面是一个示例输出： 输出

Answer 1

您不检查scanf的结果。它只是不成功，并且没有为成员分配值。

Answer 2

命令ptr[i][j]=Flats;将在每次迭代开始时删除，因为程序不会将信息保存在正确的位置。 循环应如下所示：

for(int i = 0; i <  floors; i++)
{
for(int j = 0; j < flats_per_floor; j++)
{
printf("ID:n");
scanf("%d", &ptr[i][j].Flat_ID);
printf("n");
printf("Rooms:n");
scanf("%d", &ptr[i][j].count_Rooms);
printf("n");
printf("Adults:n");
scanf("%d", &ptr[i][j].count_Adults);
printf("n");
printf("Children:n");
scanf("%d", &ptr[i][j].count_Children);
printf("n");
printf("Name:n");
scanf("%s", ptr[i][j].Family_Surname);
printf("n");
printf("Date of entry: n");
scanf("%s", ptr[i][j].Date);
printf("n");
printf("Rent:n");
scanf("%f", &ptr[i][j].rent);
printf("n");
}
}