I have char * lines[1000] string that can hold 1000 characters. How to create 100 arrays of that string. I get error with this code down.
char * lines[1000];
lines = (lines*)malloc(100 * sizeof(lines));
main.c:19:20: error: expected expression before ')' token
The simplest way is:
char lines[100][1000];
Alternatively:
char* lines[100];
int i;
for (i = 0; i < 100; i++) {
lines[i] = malloc(1000);
}
...
for (i = 0; i < 100; i++) {
free(lines[i]);
}
The latter is a bit more flexible in that -- with minor modifications -- it permits you to allocate a different amount of memory for every string.
chars being a single byte.
sizeof(char) is by definition equal to 1. Other issue if whether one char value is big enough to store an actual character, using your current encoding.CHAR_BIT bits), but that a char is size 1 byte is guaranteed by definition. From C99 specs, 6.5.3.4.3: When [sizeof is] applied to an operand that has type char, unsigned char, or signed char, (or a qualified version thereof) the result is 1.It looks like you want an array strings, each string holding at most 1000 characters. There are some issues with your code.
You've declared an array of char *s but what you really want is a pointer to an array of chars. For that, your declaration should be
char (*lines)[1000];
On the other hand, you shouldn't forget about the NULL bytes at the end of strings, and should probably instead declare
char (*lines)[1001];
To set the pointer, you'll want to use
lines = (char (*)[1001]) malloc(100 * sizeof(char[1001]));
or
lines = (char (*)[1001]) malloc(100 * sizeof(*lines));
the latter working because, with lines a pointer to an array of chars, *lines is a char[1001]. Remember to make sure you didn't get a NULL pointer back.
At the end, you should free the memory you've malloced with
free(lines);
You can write a for-loop as:
char * lines[1000];
int i = 0;
for (i = 0; i < 1000; i++)
{
lines[i] = (char*)malloc(100 * sizeof(lines));
}
Don't forget to free-up the memory pointed by all the pointers
for (i = 0; i < 1000; i++)
{
free(lines[i])
}
Why don't you create a 2 dimensional array?
(char*)not(lines*).char * lines[1000]isn't a pointer to a string of 1000 characters but is a pointer to a pointer of an array of char. It's achar**.