使用fgets在C中获得一行

Question

I have this functions , but my fgets function doesn't work properly,can anyone help me ? At case 3 , I ask the user to enter something he wants to search for the hotel, like a partial word, two words etc. po when i run it it doesn't work right , I dont understand why.

        scanf("%d", &option);


        case 3:
            printf("\nEnter the name of the hotel you want to search for.\n\n>>>");
            fgets(asked_hotel, sizeof(asked_hotel)-1, stdin);

            printf("The hotels matching what you searched are:\n\n");
            find_hotel(hotel_name,hotel_rating,address_name,city_name,address_code,NUM_HOTELS,asked_hotel);

Answer 1

The problem here is your use of scanf to get the option. It extracts the number, but leaves the newline in the buffer. This means that when you next call fgets it will read that newline and you will get an empty line.

The easiest solution is to ask scanf to skip trailing whitespace, including newlines. This is done by adding a space after the format code:

scanf("%d ", &option);
/*       ^         */
/*       |         */
/* Note space here */

Answer 2

Recommend changing all your scanf() calls to fgets() / sscanf() pairs. Example:

scanf("%d", &option);

to

char buf[80];
fgets(buf, sizeof(buf), stdin);
sscanf(buf, "%d", &option);