what does [100] means in char a[100]; ?

Question

#include <stdio.h>

int main() {
----> char a[100]; <----

gets(a);

printf("You entered: %s", a);

return 0;
}

Answer 1

That means you get memory reserved for 100 letters.

Each letter can be accessed using an index between 0 and 99.

Answer 2

You get memory reserved for 100 char variables and you can access using an index between 0 and 99

For example char a[0] = char b