Typedef - General Questions

What will be the output of the program?

#include <stdio.h>
typedef char *Str;
int main(void) {
    Str a = "hi", b = "yo";
    printf("%s %s\n", a, b);
    return 0;
}

Which is a correct typedef for a pointer to a function taking two ints and returning int?

What will be the output of the program?

#include <stdio.h>
typedef struct { int w, h; } Rect;
int main(void) {
    Rect r = {4, 5};
    printf("%d\n", r.w * r.h);
    return 0;
}

Does typedef create a new distinct type?

What will be the output of the program?

#include <stdio.h>
typedef int Arr[3];
int main(void) {
    Arr a = {1, 2, 3};
    printf("%zu\n", sizeof(a) / sizeof(a[0]));
    return 0;
}