在C中输入带空格的字符串

Question

I want my program to prompt the user for how many sentences they want to write and then enter those sentences. However, when I try entering the sentences, I keep getting errors. I tried using several different fucntions but all of them gave some kind of error. For example, right now I am trying to use fgets() and after I enter the first sentence it gives me a segmentation fault. Can someone tell me what is the best way to take input for a string with spaces and how to fix my problem?

int n;
char str[n][80];

printf("Enter number of lines: ");
scanf("%d", &n);

printf("Enter a sentecne: ");
for(int i = 0; i < n; i++){
    fgets(str[i], 80, stdin);
    printf("%s", str[i]);
}

Answer 1

You define the array str before you initialize n . That means n will have an indeterminate value (which will be seemingly random).

Move the input of n to before you define str .

Answer 2

you can use read function http://man7.org/linux/man-pages/man2/read.2.html

reading on the file descriptor 0 (standart input), a char *buffer to store your data, and a size_t size to read

there are several problems in your code

int n; // must have a value
int n = 10; // example, here your variable is initialized

you also don't check the return value of scanf