在C中是否有一个相当于sizeof()的东西？

#include <stdio.h>

int main() {
    int arr[] = {1, 2, 3, 4, 5};
    int size = sizeof(arr) / sizeof(arr[0]);
    printf("The size of the array is %d\n", size);
    return 0;
}

#include <stdio.h>

struct Point {
    int x;
    int y;
};

int main() {
    struct Point p;
    p.x = 1;
    p.y = 2;
    int size = offsetof(struct Point, x) + sizeof(p.x);
    printf("The size of the Point struct is %d\n", size);
    return 0;
}