인프런 커뮤니티 질문&답변

안녕하세요.

c6385와 c6386warning이 뜨는 이유가 궁금합니다. 동적할당하고 배열 index도 잘 참조한거 같은데 warning이 안 지워지더라고요..ㅠ 오류 처리 때문인지 교수님 오류처리 코드도 다 따라 쳐 보았지만 소용이 없네요.

#include <stdio.h>
#include <stdlib.h>
#include <String.h>

#define LENGTH 100

struct movieinfo {
	char subj[LENGTH];
	double score;
};

void manual(void);
void print_all_items(struct movieinfo* msptr, int* num);
void print_an_item(struct movieinfo* msptr, int* num);
void edit_an_item(struct movieinfo* msptr, int* num);
void add_an_item(struct movieinfo** mmsptr, int* num);
void insert_an_item(struct movieinfo** mmsptr, int* num);
void delete_an_item(struct movieinfo** mmsptr, int* num);
void delete_all_items(struct movieinfo* msptr, int* num);
void save_file(struct movieinfo* msptr, int* num);
void search_by_name(struct movieinfo* msptr, int* num);

int main()
{
	int input;
	printf("Please input filename to read press Enter.\n>> ");
	
	char fname[LENGTH] = { 0, };
	scanf("%s", fname);
	
	char a = getchar();

	FILE* fmovie = fopen(fname, "r");
	if (!fmovie) 
	{
		perror("ERROR: cannot open file.");
		exit(1);
	}
	puts("6 items have been read from the file.\n");

	int num;

	if (fscanf(fmovie, "%d%*c", &num) != 1) {
		printf("ERROR: Wrong file format.");
		exit(1);
	}

	struct movieinfo* msptr = (struct movieinfo*)malloc(sizeof(struct movieinfo) * num);

	if (msptr == NULL)
	{
		printf("malloc failed. \n");
		exit(1);
	}


	for (int i = 0; i < num; i++)
	{
		if(fscanf(fmovie, "%[^\n]%*c", msptr[i].subj) != 1 ||
			fscanf(fmovie, "%lf%*c", &msptr[i].score) != 1)
		{
			printf("ERROR: Wrong file format.\n");
			exit(1);
		}
	}

	while (1)
	{
		manual();

		scanf("%d%*c", &input);

		switch (input)
		{
		case 1:
			print_all_items(msptr, &num);
			break;
		case 2:
			print_an_item(msptr, &num);
			break;
		case 3:
			edit_an_item(msptr, &num);
			break;
		case 4:
			add_an_item(&msptr, &num);
			break;
		case 5:
			insert_an_item(&msptr, &num);
			break;
		case 6:
			delete_an_item(&msptr, &num);
			break;
		case 7:
			delete_all_items(msptr, &num);
			break;
		case 8:
			save_file(msptr, &num);
			break;
		case 9:
			search_by_name(msptr, &num);
			break;
		case 10:
			puts("Good bye");
			free(msptr);
			fclose(fmovie);
			return 0;
		default:
			printf("Wrong input.\n");
			break;
		}
		
	}

	free(msptr);
	fclose(fmovie);

	return 0;
}
void manual(void)
{
	printf("Please select an option and press enter.\n");
	printf("1. print all items\t2. print an item\n");
	printf("3. Edit an item \t4. Add an item\n");
	printf("5. Insert an item\t6. Delete an item\n");
	printf("7. Delete all items\t8. Save file\n");
	printf("9. Search by name\t10. Quit\n>> ");
}

void print_all_items(struct movieinfo* msptr,int *num)
{
	for (int i = 0; i < *num; i++)
	{
		printf("%i : \"%s\". %.1f\n",i, msptr[i].subj, msptr[i].score);
	}

}

void print_an_item(struct movieinfo* msptr, int *num)
{
	printf("Input the index of item to print.\n>> ");
	int input;
	scanf("%d%*c", &input);

	if (input<0 || input>*num)
		printf("invalid item\n");
	else
		printf("%i : \"%s\". %.1f\n", input, msptr[input].subj, msptr[input].score);
}

void edit_an_item(struct movieinfo* msptr, int* num)
{
	printf("Input the index of item to print.\n>> ");
	int input;
	scanf("%d%*c", &input);

	if (input<0 || input>*num)
		printf("invalid item\n");

	else
		printf("%i : \"%s\". %.1f\n", input, msptr[input].subj, msptr[input].score);
	
	printf("Input new title and press enter.\n>> ");
	scanf("%[^\n]%*c", msptr[input].subj);
	printf("Input new rating and press enter.\n>> ");
	scanf("%lf%*c", &msptr[input].score);

	printf("%i : \"%s\". %.1f\n", input, msptr[input].subj, msptr[input].score);
}

void add_an_item(struct movieinfo** mmsptr, int* num)
{
	int flag;
	*num = *num + 1;

	struct movieinfo* msptr = (struct movieinfo*)malloc(sizeof(struct movieinfo) * *num);

	if (msptr == NULL)
	{
		printf("malloc failed. \n");
		exit(1);
	}

	for (int i = 0; i < *num - 1; i++)
	{
		strcpy(msptr[i].subj, (*mmsptr)[i].subj);
		msptr[i].score = (*mmsptr)[i].score;
	}

	printf("Input title and press enter.\n>> ");
	flag = scanf("%[^\n]%*c", msptr[*num - 1].subj);
	printf("Input rating and press enter.\n>> ");
	flag = scanf("%lf%*c", &msptr[*num - 1].score);
	
	printf("%i : \"%s\". %.1f\n", *num - 1, msptr[*num - 1].subj, msptr[*num - 1].score);
	
	free(*mmsptr);

	*mmsptr = msptr;
}

void insert_an_item(struct movieinfo** mmsptr, int* num)
{
	printf("Input the index of item to insert.\n>> ");
	int input;
	scanf("%d%*c", &input);

	*num = *num + 1;

	struct movieinfo* msptr = (struct movieinfo*)malloc(sizeof(struct movieinfo) * *num);

	if (msptr == NULL)
	{
		printf("malloc failed. \n");
		exit(1);
	}

	for (int i = 0; i < *num - 1; i++)
	{
		strcpy(msptr[i].subj, (*mmsptr)[i].subj);
		msptr[i].score = (*mmsptr)[i].score;
	}

	int imp = *num;

	for (; imp - 1 > input; imp--)
	{
		strcpy(msptr[imp - 1].subj, msptr[imp - 2].subj);
		msptr[imp - 1] = msptr[imp - 2];
	}
	
	printf("Input title and press enter.\n>> ");
	scanf("%[^\n]%*c", msptr[input].subj);
	printf("Input rating and press enter.\n>> ");
	scanf("%lf%*c", &msptr[input].score);

	printf("%i : \"%s\". %.1f\n", input, msptr[input].subj, msptr[input].score);

	free(*mmsptr);
	*mmsptr = msptr;
}

void delete_an_item(struct movieinfo** mmsptr, int* num)
{
	printf("Input the index of item to delete.\n>> ");
	int input;
	scanf("%d%*c", &input);

	*num = *num - 1;

	struct movieinfo* msptr = (struct movieinfo*)malloc(sizeof(struct movieinfo) * *num);

	if (msptr == NULL)
	{
		printf("malloc failed. \n");
		exit(1);
	}

	int imp = input;

	for (; input < *num; input++)
	{
		strcpy((*mmsptr)[input].subj, (*mmsptr)[input + 1].subj);
		(*mmsptr)[input].score = (*mmsptr)[input + 1].score;
	}

	for (int i = 0; i < *num; i++)
	{
		strcpy(msptr[i].subj, (*mmsptr)[i].subj);
		msptr[i].score = (*mmsptr)[i].score;
	}

	free(*mmsptr);
	*mmsptr = msptr;
}

void delete_all_items(struct movieinfo* msptr, int* num)
{
	*num = 0;
	msptr = NULL;
}

void save_file(struct movieinfo* msptr, int* num)
{
	printf("Please input filename to write and press Enter.\n>> ");
	char fname[LENGTH] = { 0, };
	scanf("%s", fname);

	FILE* fmovie = fopen(fname, "w");

	fprintf(fmovie, "%d\n", *num);

	for (int i = 0; i < *num; i++)
	{
		fprintf(fmovie, "%s\n%.1lf\n", msptr[i].subj, msptr[i].score);
	}

	printf("%d items have been saved to the file.\n",*num);

	fclose(fmovie);
}

void search_by_name(struct movieinfo* msptr, int* num)
{
	printf("Input title to search and press enter.\n>> ");
	char strcm[LENGTH] = { 0, };
	scanf("%[^\n]%*c", strcm);

	int i;
	for (i = 0; i < *num; i++)
	{
		if (strcmp(strcm, msptr[i].subj) == 0)
			break;
	}

	if (i == *num)
		printf("No movie found : %s\n", strcm);
	else
		printf("%i : \"%s\". %.1f\n", i, msptr[i].subj, msptr[i].score);
}