Const - General Questions

What will be the output of the program?

#include <stdio.h>

int main(void) {
    const char *s = "const";
    s++;
    printf("%s\n", s);
    return 0;
}

int const *p is the same as:

Must a const variable be initialised when declared?

What will be the output of the program?

#include <stdio.h>

int main(void) {
    const int a = 10;
    int b = a * 2;
    printf("%d\n", b);
    return 0;
}

What will be the output of the program?

#include <stdio.h>

int main(void) {
    const int n = 5;
    int arr[n];
    printf("%zu\n", sizeof(arr) / sizeof(arr[0]));
    return 0;
}